Engine/Transmission (1994 - 1998) pilot brg.

[toots]

Think I found my pilot brg problem. The in put shaft is . 015 out. Any ideas how this could happen?

 

[GCroyle]

toots,



I'm not a transmission expert, but I have seen input shaft up/down wiggle on almost all that I have worked with. What is the correct method to assess and determine good/bad, someone else can add to it.



Pilot bearing wear is influenced by several factors. Mileage certainly, how often the pilot is active vs. inactive and frequently un-diagnosed is the critical alignment of the input shaft to crankshaft.



Active vs. Inactive.

Engine running, clutch pedal UP, (clutch engaged) any gear. Crank, pilot and input shaft are all running at the same RPM, meter stops on pilot wear, = Inactive.

Engine running clutch pedal down (clutch released) in gear, prime example is waiting for a red light, = pilot Active and wearing.



Minimize the pilot wear time and you extend pilot life.



Alignment. If you can see a factory service manual that has the 5 speed clutch R&R is has a procedure to measure the concentricity and parallelism of the bellhousing hole and face relative to the crankshaft. Problem, can't do this test to the integral housing 6 speed trans.



Observations:

1. Is the input shaft worn where the pilot rides? If so, not good, means pilot failed to the point where it starts to wear against the bearing support surface.

2. Look carefully for missing dowel sleeves and look very closely for previous installation damage by the dowel sleeves into the relatively soft AL bellhousing alignment holes.

 

[WilsonF]

All the shafts I have worked with had some play. Just install a new bearing. You didn't say how old the transmission, clutch and bearing is.

Floyd

 

[Joseph Donnelly]

If you mean that the big hole in the bell housing that the transmission plugs into is offset from being centered, you need to remove and modify the alignment dowels in the block plate and/or holes for them in the bell housing, so you can center the housing on the crank.