Tecumseh manual 4 cycle ohv

The shape of the governor weights force the governor spool to lift. The governor rod maintains contact with the governor spool due to the governor spring tension. The governor rod rotates causing the attached outer governor lever to push the solid link and close the throttle opening. When the engine speed decreases, the lower centrifugal force allows the governor weights to be pulled in by the governor spring.

The governor rod rotates and the solid link moves the throttle to a more open position diag. Hunting engine R. Engine overspeeding must be corrected immediately before serious engine damage occurs. Use the applicable following procedure to diagnose a suspected governor failure. If the engine runs wide open faster than normal , shut the engine off or slow it down immediately.

Check the condition of the external governor shaft, linkage, governor spring, and speed control assembly for breakage or binding. Correct or replace binding or damaged parts. Follow the governor adjustment procedure and reset the governor - see "Service" in this chapter. Run the engine. Be ready to shut the engine off if an overspeed problem still exists.

If the problem persists, the engine will require disassembly to inspect the governor gear assembly for damage, binding, or wear. See Chapter 9 under "Disassembly Procedure" to disassemble the engine. Remove the governor gear assembly. Repair or replace as necessary. Try to stabilize the engine R. If the engine R. See "Service" governor adjustment procedure in this chapter. If the problem persists after the governor adjustment, check the engine R.

The R. If the R. Check the governor shaft or linkages for binding, wear, or improper hookup. Check the governor spring for adequate tension or damaged condition.

Push the governor lever to move the carburetor throttle plate to the wide open position. Rotate the governor clamp counterclockwise on all overhead valve engines covered in this manual.

Hold the lever and clamp in this position while tightening the screw diag. On some governor assemblies, the retaining ring must be removed to allow the spool or gear to slide off the shaft.

Other governor shafts use an upset to hold the governor spool on. If the gear requires replacement, the governor shaft will have to be removed. Grip the original spool in a vise and use a twisting and pulling motion on the flange until the spool is free.

Clamp the shaft in a vise and pound gently on the flange with a wooden or plastic mallet to remove the shaft diag. To install a new shaft, first assemble the gear and washer on the shaft. Start the shaft into the hole with a few taps from a soft faced hammer. Place the flange in a press with a solid piece supporting the area below the shaft boss.

Press the shaft in until a part Remove the retaining ring, spool, gear assembly, and washer s. Clamp the shaft in a vise and pound gently on the flange with a wooden or plastic mallet to remove the shaft.

Start the new shaft into the shaft boss by tapping with a soft faced hammer. Refer to the chart at right for the proper shaft exposed length from the mounting surface.

Add a drop of red Loctite and press the governor shaft to the proper depth using a press or a vise. Wipe the extra Loctite off after installation. Reassemble the washer s , governor gear, and spool followed by the retaining ring. Linkage attachment points are best recorded or marked prior to disassembly. This assures the correct placement during reassembly. The solid link is always connected from the outermost hole in the governor lever to the throttle in the carburetor.

The governor spring is connected between the speed control lever and the governor lever. Vertical shaft engines may use an adjustable intake pipe mounted speed control bracket located above the carburetor, or a vertical or horizontal control mounted on the side of the engine. The ignition ground out terminal, idle R. The adjustable speed control bracket which is mounted on the intake pipe must be aligned properly when installing.

To align the control bracket, use the following steps. Loosen the two screws on the top of the panel. Move the control lever to full wide open throttle position and install a wire or aligning pin through the hole in the top of the panel, the hole in the choke actuating lever, and the hole in the choke diag. With the components aligned, tighten the two screws on the control panel. The following pages show common linkage hookup arrangements. Whenever the carburetor or the governor linkage is removed or replaced, the engine R.

Use microfiche card 30 or contact a local Tecumseh dealer for the correct R. Loosen the bowden wire clamp, place the equipment control to the "fast" position, move the engine control lever to contact the high speed stop, and hold the lever in this position while tightening the bowden wire clamp. When the engine is running, the governor controls both the idle and the high engine speed.

In order for the governor to respond properly to a crankshaft load at engine idle, the idle speed screw on the top of the carburetor must be set RPM lower than the governed idle speed. Use the following procedure to set the engine speeds diag. Check to find the correct engine speeds found on microfiche card 30 or using the Computer Parts Lookup System.

Start and allow the engine to run minutes before beginning adjustments. Place the control knob in the lowest engine speed position. Use a Vibra-Tach or other tachometer to set the non-governed idle speed RPM lower than the governed idle speed by pushing the bottom of the governor lever away from the control bracket so the throttle lever contacts the idle speed screw and hold the lever in this position.

Turn the idle speed screw clockwise to increase or counterclockwise to decrease engine idle speed. Allow the governor to control the throttle. Use a Vibra-Tach or other tachometer and bend the tab as shown to achieve the specified governed idle speed. Slide the control knob to the high speed position and bend the tab as shown to achieve the specified governed high engine speed.

Remove the air cleaner cover and air cleaner element to gain easier access to the speed control lock nut that holds the control levers together. Discard the detent bearing plate and in its place install the washer with the smaller I. Install the lever over the post making sure that the end of the lever is in the slot of the control. Place the other washer with the large I. The smaller side of the bushing goes towards the lever and fits inside of the lever and the washer.

Discard the wave washer. Install the lock nut. Check the alignment of the lever, bushing and washers to ensure that everything is aligned properly and torque the lock nut to 20 in. The control lever should move freely. This engine speed control is set up with the "stop in the control".

If a remote stop is desired remove and discard the short green wire that runs from the speed control grounding terminal to the remote grommet stop blade. Reinstall the blade and screw. It will now be necessary to run a grounding wire to a remote grounding switch in order to stop the engine.

A remote grounding switch can be added to the engine at this terminal as well, thus allowing the engine to be stopped at either the stop in the control or the remote grounding switch. This remote speed control may have governed idle, a choke override, and the option of an ignition remote stop terminal block.

The speed control is adjusted to the equipment throttle control by aligning the slot in the speed control lever with the alignment hole on the mounting bracket.

Place a pin through the two holes, place the equipment throttle control to the wide open position, hook the bowden cable end in the control as shown, and tighten the cable housing clamp. In this position, the gap of. This will assure that the carburetor will go into full choke when the control is placed in the start position.

The idle speed is adjusted by turning the idle speed screw clockwise to increase engine R. Use tool part to adjust the high speed engine R. Place the slotted end of the tool onto the adjustment tab and bend the tab to the left away from the control to increase engine R.

Throttle plate alignment on all models with speed controls mounted on intake manifold. This adjusts choke in control as well diag. NOTE: Assure that the throttle cable has full travel from wide open throttle to full choke. Hard starting could result if the cable is not properly adjusted to allow for full choke.

Place the slotted end of the tool onto the adjustment tab and bend the tab to the left toward the spark plug end to increase engine R. OHV 11 engines use nylon bushings on the throttle and choke linkage hook-up points to extend the life of the linkage and to enhance the stability of the governor system.

Make sure they are in good condition and in place diag. Horizontal shaft engines use recoil starters which can be mounted to pull either vertically or horizontally. All recoil starters turn the engine over by engaging a dog s into the starter cup attached to the engine flywheel. All starters are spring loaded to retract the dog s when the engine speed exceeds the turning speed of the starter.

The starter dog s is pinned or pocketed in the pulley hub and extend outward when the pulley rotation forces the starter dog s to contact the ears on the retainer. The retainer ears act as a ramp to fully extend the starter dog s.

The fully extended starter dog s locks in contact with notches in the starter cup. When the engine fires and the rotational speed of the starter cup exceeds the starter pulley, the starter dog s disengages from the starter cup. The starter dog spring s returns the starter dog s to the disengaged position. When the starter handle is released, the recoil spring turns the starter pulley in the opposite direction to retract the starter rope.

Visually inspect the starter dog s , starter cup, retainer, springs, rope, washers, and the starter pulley for wear or breakage. Use one of the following procedures that apply to the application to disassemble, repair, and assemble the starter. Always consult the Tecumseh Master Parts Manual for the correct replacement parts.

Consult the Tecumseh Master Parts Manual to obtain the correct part number, length, and size required. Use the following rope chart to convert a numbered rope to a fractional diameter for bulk rope use. The rope ends should be cauterized by burning with a match and wiping the rope end with a cloth while hot. Remove the starter handle if the retainer is a complete circle design. Remove the staple and old retainer.

Slide the rope retainer into the proper position and insert the staple using a pliers. Install the starter handle and tie a left hand knot to secure the handle. After removing the rewind assembly from the engine blower housing, release the tension on the rewind spring. Remove the starter handle and carefully allow the rope to unwind into the starter housing diag. Remove the decal or plastic disc in the center of the rewind. Place a 1" Set the rewind on a bench, supported on the socket.

The stamped steel center pin is driven out from the outside, the punch tip must be angled inside the center hole. Move the punch around while driving the pin to help keep the pin straight.

Remove the brake spring, retainer, washers, and pulley assembly diag. Note: The starter dogs face out on the stamped steel starter and the dogs face in on the stylized rewind starter.

All components in need of service should be replaced. Assembly Procedure 1. Reverse the disassembly procedure. The starter dogs with the dog springs must snap back to the center of the pulley disengaged position.

When the rope is pulled, the tabs on the retainer must be positioned so that they will force the starter dogs to engage the starter cup. Install a new recoil spring if necessary by pushing the new spring out of the holder into the pulley cavity while aligning the outside spring hook into the deep notch in the pulley. Push the spring cover in until seated. Always replace the center spring pin with a new one upon reassembly.

Place the two new plastic washers between the center leg of the starter and the retainer. New plastic washers are provided with a new center spring pin. Discard the old plastic washer. The retainer will bend and the starter dogs will not engage the starter cup. On the stamped steel starter the center pin should be driven in until it contacts the shoulder in the starter housing. Replacing rope wind the starter pulley counterclockwise four or five turns to pre-load the recoil spring and thread the rope through the starter housing eyelet.

Pull enough rope through to tie a temporary knot in the rope. Reattach the starter handle to the rope using a left-hand knot. Untie the temporary knot and allow the rope to recoil. After removing the rewind assembly from the engine blower housing, remove the starter handle by first pulling a length of rope out using the handle, tying a temporary knot in the exposed rope, and either untying the knot in handle or prying out the staple. Untie the temporary knot and slowly allow the rope to fully retract into the starter housing and the recoil spring to fully unwind.

Remove the decal from the center of the starter housing. Use a small Phillips screwdriver or similar tool to pry the retainer legs apart and lift out the retaining wedge. Pinch the legs of the retainer together and pull on the head of the retainer to remove it from the housing.

Remove the pulley assembly from the recoil housing. Assembly 1. If replacing the starter rope, see Step 8. Apply a small amount of lithium grease to the inner bore of the center shaft. Replace or check that both starter dogs are in the pulley pockets and that the dog springs are hooked on the outer surface of the dog.

Pinch the two legs of the plastic retainer together and start into the center shaft hole. Rotate the retainer so the two tabs on the bottom of the part fit between the dog and pulley hub left side of the dog.

Push the retainer in until the leg prongs pop out of the center shaft. Turn the starter over and snap the locking tab between the retainer legs, replace the top decal. Wind the starter pulley counterclockwise four or five turns to pre-load the recoil spring and thread the rope through the starter housing eyelet. Untie the knot in the rope and slowly release the spring tension. Remove the center screw, retainer cam dog on snow proof type , starter dog s and dog spring s , and brake spring diag.

Turn the spring and keeper assembly to remove the pulley. Lift the pulley out of the starter housing. Replace all worn or damaged parts. Place the rewind spring and keeper assembly into the pulley. Turn the pulley to lock into position. A light coating of grease should be on the spring. Install the brake spring, starter dog s , and starter dog return spring s.

The starter dog spring s must hold the dog s in against the pulley. Replace the retainer cup cam dog on snow proof starter and retainer screw. Tighten to 65 - 75 in. The center screw torque on cast aluminum starters is to in. Tension the recoil spring by winding the pulley counterclockwise until it becomes tight, then allow the pulley to unwind until the hole in the pulley lines up with the rope eyelet in the starter housing.

Install a knotted rope through the pulley and the eyelet and install the handle. A left-hand knot should be tied on the end of the rope to secure the handle. Stylized Starter OHV Remove the starter handle by first pulling a length of rope out using the handle, tying a temporary knot in the exposed rope, and untying the knot in the handle. Remove the nut using a 10 mm socket and washers from the center leg of the recoil housing.

Slowly unwind the dog spring by allowing the starter dog retainer to rotate. Remove the starter dog retainer, starter dog spring, brake spring, and starter dogs. Remove the starter pulley. Remove the starter rope from the pulley if necessary. Replace the starter rope if removed by inserting one end through the hole in the side of the pulley and tying a left hand knot near the rope end. Pull the knot into the squared area and wind the rope counterclockwise viewed from the pulley bottom on the starter pulley.

Place the pulley on the housing center leg, align the end of recoil spring and the notch in the pulley and push down until seated. Insert the starter dogs on the pulley pegs with the flat side away from the pulley, place the brake spring and starter dog spring on the pulley. The starter dogs must be free to retract into the pulley pocket. Tighten the hex nut to 40 inch pounds 4.

Wind the pulley counterclockwise turns, thread the rope through the starter housing hole, and place a temporary knot in the rope leaving at least one foot of rope length. Slide the starter handle on the end of the rope and secure using a left hand knot. Remove the temporary knot and allow the rope to retract. The battery is part of both the starting and charging circuit. The battery should be checked before going into any extensive starter or charging system checks. If a battery has a shorted cell, overcharging can result, and the regulator or rectifier may appear to be at fault.

If a cell has an open or high resistance connection, the electric starter operation will be affected. The power source used to provide the energy to turn an electric starter motor on Tecumseh engines is either volt A. A volt A. The 12 volt battery models require a charging system to maintain proper battery charge. The starting circuit includes the battery, battery cables, starter or ignition switch, safety switches, starter solenoid, and an electric starter motor.

The charging system consists of alternator charge coils, rectifiers or diodes, regulator, ignition switch, flywheel magnets, and a battery. All engines that have a charging system will use a combination of some or all of these features. A strong magnetic force is produced by the electrical current running through the armature windings. The armature magnetism repels the magnetism produced by the permanent field magnets of the electric starter.

The repelling magnetic forces cause the armature to rotate, moving the drive pinion laterally on the splined armature shaft, meshing the starter pinion gear with the flywheel ring gear. When the drive pinion contacts the stop at the end of the armature shaft, the pinion rotates along with the armature shaft to crank the engine. The armature and pinion remain positively engaged until the engine fires and the flywheel rotates faster than the armature. The greater momentum of the flywheel throws the starter pinion gear out of mesh and forces the starter pinion back to the disengaged position.

After the switch is released, the starting circuit is opened and the armature coasts to a stop. A small anti-drift spring holds the pinion in the disengaged position diag. The engine needs to be running to produce an electric current flow. When a conductor alternating coils cuts the magnetic field generated by the magnets in the flywheel, a current is induced in the alternator coil. The permanent magnets in the flywheel have a magnetic field in which the lines of magnetic force run from the North Pole to the South Pole.

As the flywheel rotates and the position of the magnets change, the direction of the magnetic field changes or alternates. The alternating coils are wound in different directions to allow current to flow as an A. This is accomplished by using a diode or rectifier diag.

A single diode makes use of only one half of the A. This is acceptable in certain applications. In certain situations it is necessary to make use of the entire A.

Current flows through a diode when the anode is more positive than the cathode. The cathode end of the diode should point toward the battery when diode is used between a charging system and a battery.

It does not allow the negative portion through. The chemical energy produced by the dissimilar metals of the battery plates provides a electrical potential that is used to power the electric starter or unit accessories. Consult the original equipment manufacturers service manual for battery size, capacities, and testing procedure.

CONDITION: All wiring must be fully insulated between connection points, securely fastened and free of foreign material such as rust and corrosion at the connection points.

This is especially important in the use of batteries where much of the potential may be lost due to loose connections or corrosion. Remember to check the insulation on the wire. All it takes is a pin hole for leakage to "ground out" on the engine or frame.

This is of special concern when moisture or water is present. Wire diameter is measured in increments of gauge numbers. As the gauge number of the wire increases, the wire diameter decreases in size diag. The starter circuit wiring must be rated at 6 or lower gauge number. The charging circuit wiring must be rated at 16 or lower gauge number 20 amp system requires 14 or lower gauge number.

The magneto circuit wiring ground circuit must be rated at 18 or lower gauge number. Leads Alternator D. When a magnet is moved past the coils, a current is induced in the coils. In general, the greater the number of coils, the greater the output of the alternator. This is accomplished by using a diode or rectifier. The regulator prevents overcharging of the battery and the rectifier changes the alternating current to direct current. All metals are conductors of electricity, but some are better conductors than others.

Silver, copper and gold are some of the better known conductors. Some of the more common materials that are insulators are glass, plastic, rubber, ceramics and porcelain. Battery defective or not charged. Corroded or loose terminals or connections, or wrong connections. Cracked insulation or broken wires.

A wire "grounding out" in the system. Defective switch. Operator presence system functioning properly. Identify the charging system used by model and specification number or visually checking the electrical plug Consult the Mechanic's Handbook or Electrical Troubleshooting booklet for test procedure for the charging system used Test for either AC or DC voltage as directed at the proper engine RPM.

Check diodes, replace if no continuity exists or if continuity exists reversing test leads Check fuses, replace as necessary Check switches, wiring, or lights for shorts. Check the power source using an electrical tester and following the tester's recommended procedure. Make sure the battery meets the minimum battery voltage requirements found in the original equipment manufacturer's service manual.

Check the electric starter terminal for the required voltage 12v D. Check wiring, connections, fuses, ignition or starter switch, safety switches, or solenoid for continuity using a ohmmeter or a continuity light. Remove all equipment loads from the engine. Take off all drive belts, chains, and couplers to isolate the engine from the equipment it is powering. Try to turn the engine over using the recoil assembly if equipped.

If the engine doesnt turn over, a mechanical binding may be the cause. Check for proper lubrication oil level and viscosity and check for electric starter gear and flywheel ring gear interference. If no problem is discovered, the problem is an internal failure.

If the engine binds only on the compression stroke, check the engine valve clearance per the specification table in Chapter If the valve clearance is within the specifications, the camshaft compression release failure may require replacement. Valve clearance not within the listed specifications will require resetting the rocker arms to obtain the proper clearance. If the engine turns over freely, the electric starter should be replaced or disassembled and checked.

See "Service" in this chapter. If the preceding steps fail to correct the problem, the engine will require to be disassembled to find the mechanical failure. See Chapter 9 under "Disassembly Procedure". The charging system used on the engine is best identified by obtaining the engine model number and the specification number on the engine.

Consult a Tecumseh dealer or a parts manual to identify the charging system. To make many of the tests it is necessary to run the engine and measure alternator output with a voltmeter. When making voltage tests with the engine running, it is not necessary to take readings at all the listed R. Checking at one of the speeds is sufficient. In some cases an open circuit D. A SCR Silicon Controlled Rectifier is located in the circuit which requires a minimum turn on voltage to allow it to conduct.

Without the battery in the circuit this turn on voltage is not present. The SCR senses this and there will be no D. Each charging system has its own testing procedure. Test the charging system using the applicable procedure found on the following pages. Set the voltmeter to the 0 - 20 D. Connect a voltmeter across the battery.

The voltmeter should read the battery voltage. Start the engine. With the engine running, there should be an increase in the voltage reading. If there is no change in the voltage reading, the alternator is defective and should be replaced. See Chapter 9 for "Disassembly Procedure" diag. Connect a wire lead from the single pin connector coming out of the engine to one terminal of a No.

Connect another wire lead to the other terminal of the bulb and run to a good ground on the engine. Start the engine and test the circuit using the A. With the engine running, minimum A. If minimum values are noted, the alternator is okay. If less than the minimum values, the alternator is defective. See Chapter 9 for "Disassembly Procedure". To check out the alternator, check the A.

With engine running, minimum values should read: R. It the above minimum readings are noted, the alternator is okay. Check for defective lights, wiring or switches, if less than the above readings, the alternator is defective. If output is below standard listed pull back protective coating in front of the diode and check A. Volts - 8. The direct current D.

The leads from the alternator and the type of connector may vary, but the output readings will be the same. If faulty, replace with a six 6 AMP fuse. To check D. Ground the other probe to the engine diag. With the engine running minimum values should read: R. If one of these minimum readings are noted, the system is okay.

Check for bad battery, ammeter, wiring, etc. If no reading or less than the above reading, proceed to make an A. Test the A. If low or no voltage is experienced, replace the alternator.

If the alternator puts out the minimum A. To replace the diode, disconnect at plug spade terminal and cut the wire on the opposite end of the diode at the solderless crimped connector.

Reconnect plug end or spade connector diag. New heat shrink tubing can be installed by slipping over the wires and heating with a hot air gun. If this is not available, tape the diode and connections with electrical tape. If a known good battery fails to maintain a charge, proceed to make an A. To do this, the blower housing must be removed, and the regulator-rectifier must be brought outside of the blower housing.

Reinstall the blower housing. Disconnect the red D. With the engine running, the minimum values should read: R. If the minimum values are noted, the alternator is ok and the regulator-rectifier is defective. If less than above readings, the alternator is defective.

Alternator This unit combines a 3 Amp D. Located in the red wire of the harness is a diode which converts the alternating current to direct current for charging the battery. The yellow wire provides the A. A wire harness part may be added to the 3 Amp D. Test the charging system using the applicable " Checking the System " procedure listed in this section. Test the diode in the harness by using a continuity test diag.

Replace the diode if continuity exists after reversing tester leads or no continuity is found. Use the procedure for diode replacement found in the 3 AMP alternator test diag. Measure the A. With the engine running, the minimum values should be:. Red wire R. C R. OHSK80 - OHV 11 - 13 without oil filter. Part No. Description: Starter Muff Kit. Models Used on: LEV,. Models Used on: TVM,. Model numbers are located on the engine shroud.

Statements in this manual preceded by the following words and This information will be needed to use this book or obtain parts from a local TecumsehPower dealer. Short Block Horizontal or S. Short Block Vertical. Original model identification numbers of an engine should always be transferred to a new short block for correct parts identification diag.

Unleaded gasoline burns cleaner, extends engine life, and promotes good starting by reducing the build up of combustion chamber deposits. Leaded fuel is generally not available in the United States and should not be used if any of the above options are available. Regardless of which of the approved fuels are used, fuel quality is critical to engine performance. Fuel should not be stored in an engine or container more than 30 days prior to use.

Be sure original container is marked: A. Using multigrade oil may increase oil consumption. Capacities Engine Model Oz. Add to cart Become an eManualOnline member today to read and access full manuals.