REMOVAL & INSTALLATION
There are two types of clutch pressure plates used, diaphragm and coil spring. In general, the larger heavy duty clutches are usually of the coil spring pressure plate type. Most removal and installation details are similar for both types.Diaphragm Spring Pressure Plate
- Remove the transmission.
- Disconnect the fork pushrod and remove the flywheel housing. Remove the clutch throwout bearing from the fork.
- Remove the clutch fork by pressing it away from the ball mounting with a screwdriver until the fork snaps loose from the ball or remove the ball stud from the clutch housing.
- Install a pilot tool (an old mainshaft makes a good pilot tool) to hold the clutch while you are removing it.
Before removing the clutch, mark the flywheel, clutch cover and one of the pressure plate lug nuts so the assembly can be installed in its original position, as it is a balanced unit.
- Loosen the clutch attaching bolts one turn at a time to prevent distortion of the clutch cover until the tension is released.
- Remove the clutch pilot tool and the clutch from the vehicle.
Inspect the clutch disc for wear, scoring, or signs of overheating. Replace it as necessary. If the clutch disc is oil-soaked, examine the engine and transmission seals. Inspect the flywheel and pressure plate for scoring, overheating, or excessive wear. The flywheel can be refaced, if necessary, although heavy scoring or overheating warrant replacement. Worn pressure plates must be replaced.
- Install the pressure plate in the cover assembly, aligning the notch in the pressure plate with the notch in the cover flange.
- Install the pressure plate retracting springs, the lockwashers and the drive strap to the pressure plate bolts. Tighten them to 11 ft. lbs.
- Turn the flywheel until the X mark is at the bottom.
- Install the clutch disc, pressure plate and cover, using an old mainshaft as an aligning tool.
- Turn the clutch until the X mark on the clutch cover aligns with the X mark on the flywheel.
- Install the attaching bolts and tighten them a little at a time in a crisscross pattern until the spring pressure is taken up.
- Remove the aligning tool.
- Pack the clutch ball fork seat with a small amount of high temperature grease. Too much grease will cause slippage. Install a new retainer in the groove of the clutch fork, if necessary. Install the retainer with the high side up and the open end on the horizontal.
- If the clutch fork ball was removed, reinstall it in the clutch housing and snap the clutch fork onto the ball.
- Lubricate the inside of the throwout bearing collar and the throwout fork groove with a small amount of graphite grease.
- Install the throwout bearing.
- Install the flywheel housing and transmission.
- Further installation is the reverse of removal. Adjust the clutch linkage as previously outlined.
Basically, the same procedures apply to diaphragm clutch removal as to coil spring clutch removal.
- Before removing the clutch, punchmark the flywheel, clutch cover and one pressure plate lug so that the components can be reassembled in their original locations.
- Loosen the attaching screws one turn at a time to prevent distortion.
- Place 3 / 8 in. spacers between the clutch levers and the cover to hold the levers down as the screws are removed.
- Adjust the clutch after installation.