Piston Slap?

[paulyg]

If anyone can figure this out by the Brisbane swap and show, I will buy them a beer. If I figure it out, I’ll post it here and buy myself a beer. 

[2002iii]

4 hours ago, allen said:

Mine starts 1 minute after starting the car, when it’s cold and revs are low but if I keep the revs above 1000 it disappears and once it’s warms up it’s gone all together…2 weeks ago I did the timing chain/oil pump and chain…checked all the bearings and everything looked good…it’s got me stumped 

Did you make sure you got the correct oil pump chain? The wider m3 one fits but is loose.

[allen]

5 hours ago, 2002iii said:

Did you make sure you got the correct oil pump chain? The wider m3 one fits but is loose.

Yep…got the thinner one…new pump and sprocket 

[allen]

So yesterday I pulled the sump and found a lot of end play in the crankshaft…then I pull the thrust bearing out and saw this…one side of the bearing looks worn but the other side is ok…but what’s puzzling is the inside of the bearings looks ok !

 

how does this happen 

Edited April 24, 2023 by allen

[jimk]

When you depress the clutch pedal, the force the throw out bearing puts on the  pressure plate is also on the rear of the thrust bearing.  Without the thrust bearing, the crankshaft would be pushed out the engine front.  So the rear side of the bearing has the wear.  Avoid sitting at a stop light with the clutch depressed!

[2002iii]

13 hours ago, allen said:

So yesterday I pulled the sump and found a lot of end play in the crankshaft…then I pull the thrust bearing out and saw this…one side of the bearing looks worn but the other side is ok…but what’s puzzling is the inside of the bearings looks ok !

 

how does this happen 

I'm going to guess manufacturer defect.

[Son of Marty]

I'm going to guess bearing shell not installed the right way or main cap reversed.