Clutch Housing Face Runout
CLUTCH HOUSINGThe clutch housing maintains alignment between the crankshaft and transmission input shaft. Misalignment can cause clutch noise, hard shifting, incomplete release and chatter. Also premature pilot bearing, cover release fingers and clutch disc wear. In severe cases, it can cause premature wear of the transmission input shaft and front bearing.
NOTE: Only the NV4500 clutch housing can be checked using the following bore and face runout procedures. The NV5600 clutch housing is a integral part of the transmission and can only be checked off the vehicle.
Clutch Housing Face Runout
1. Position dial indicator towards the housing face (Fig. 15) with indicator plunger on the rim of the housing bore.
2. Rotate crankshaft until indicator plunger is at the 10 O'clock position and zero the dial indicator.
3. Measure and record face runout readings at four points 90° apart (Fig. 16). Take measurement at least twice for accuracy.
4. Subtract lowest reading from highest to determine total runout. If low reading was minus 0.004 inch and highest reading was plus 0.009 inch the total runout is 0.013 inch.
NOTE: Maximum acceptable face runout is 0.010 inch. To correct this example (Fig. 16) the shims needed between the clutch housing and transmission are:
0.009 inch at the 0.000 corner
0.012 inch at the -0.003 corner
0.013 inch at the -0.004 corner
After installing the clutch assembly and housing, tighten the housing bolts nearest the alignment dowels first.
NOTE: Shims can be made from shim stock or similar materials of the required thickness (Fig. 17).