seized balance shaft - common?
04-30-2009, 03:54 PM
#1
Rennlist Member
Thread Starter
seized balance shaft - common?
Looking at buying a local 951 motor, but it has a repair history of a seized balance shaft. Motor did this at approx 52k confirmed miles. Previous owner of the car recalled that it may have happened twice during his ownership (existing repair records showed only one fix, but he thought it happened again).
I am not experienced with this happening, and I think its rather unusual. Especially if it happened more than once. Either an oiling problem or an out of tolerance shaft or cover/block.
Its an 86 block, so I think those have the early style internal caps for the rear b/s bearing, unlike the later blocks.
Anyone have this happen to them?
I am not experienced with this happening, and I think its rather unusual. Especially if it happened more than once. Either an oiling problem or an out of tolerance shaft or cover/block.
Its an 86 block, so I think those have the early style internal caps for the rear b/s bearing, unlike the later blocks.
Anyone have this happen to them?
04-30-2009, 04:10 PM
#2
Nordschleife Master
Looking at buying a local 951 motor, but it has a repair history of a seized balance shaft. Motor did this at approx 52k confirmed miles. Previous owner of the car recalled that it may have happened twice during his ownership (existing repair records showed only one fix, but he thought it happened again).
I am not experienced with this happening, and I think its rather unusual. Especially if it happened more than once. Either an oiling problem or an out of tolerance shaft or cover/block.
Its an 86 block, so I think those have the early style internal caps for the rear b/s bearing, unlike the later blocks.
Anyone have this happen to them?
I am not experienced with this happening, and I think its rather unusual. Especially if it happened more than once. Either an oiling problem or an out of tolerance shaft or cover/block.
Its an 86 block, so I think those have the early style internal caps for the rear b/s bearing, unlike the later blocks.
Anyone have this happen to them?
They are sleeve bearings, metal on metal like rod bearings...kinda... but I do not believe they get near the oil bath the rod bearings get.... NOT unheard of, but I don't believe it is a common failure... if twice in one motor, I would consider expanding your search to a different motor... unless the second time was caused by **** poor work repairing the first time...
