944 Driveline Information
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944 Drive Shaft Problems
We are noticing many 944 torque tubes coming in for rebuilds with damaged or worn out drive shafts that make them unusable for rebuilds and unacceptable for cores. Most of the problems are with the front nub of the 944 drive shaft that fits into the pilot bearing at the back of the crank shaft. This holds the drive shaft in place and keeps the drive shaft from vibrating under operation within the clutch. Pronounced vibrations will damage clutches and the drive shaft so this is a very important area to make sure it is within specifications. The easiest method is to take a pilot bearing and fit it on the nub. The fit should be snug with no looseness. The looser it feels the more the drive shaft will vibrate.
This picture shows three 944 drive shafts. The bottom one was still a snug fit and was acceptable for rebuilding. The middle one was loose and not acceptable, a fact which could not visually be determined. The top drive shaft is extremely out of specification which can be easily seen.
It is very important that the pilot bearing at the back of the crank shaft be changed with every 944 torque tube R&R. Not doing so will result in damaging the drive shaft nub which can cause further damage to the 944 drive line.