What causes thrust bearing failure?

[MKSeven]

Update on this?

 

[j255c]

I gave up and got a Southbend Stage 3. Going Stage 2 in a month.

 

[wascally wabbitt]

I don't think that second photo is quite right, there has to be machined recessed surface like in photo 1 and 3 where the thrust washer is located.

Item 9 in the diagram is the infamous thrust washer.

Also axial play of the crank is limited to 0.07 to 0.30 mm.

what would be the course of action if crank axial play measures near the .3mm wear limit?

 

[GTIfan99]

I'm talking about the un lubricated lateral force applied to the crankshaft and thrust bearing when the clutch pedal is depressed on startup

Except it's not really unlubricated. Oil with a good film strength is providing lubrication.

 

[jimlloyd40]

Wonder how expensive it would be to put a pre oiler on or if anyone even makes one? Had one on a 77 Ford pickup truck.

 

[PerceivedShift]

Would it be possible to measure thrust bearing wear using a dial bore gauge on the damper/pulley? The idea is that the pressure plate pushes the crankshaft against the thrust bearing towards the passenger side right? In the service manual there is a page on "measuring axial clearance" with a dial bore gauge with a clearance of 0.07-0.23mm and wear limit of 0.30mm. I really wonder if this measurement can be done outside the engine using the clutch to push the crank.

Though I might be over my head here...someone who knows what they are talking about chime in.

 

[shovelhd]

Would it be possible to measure thrust bearing wear using a dial bore gauge on the damper/pulley? The idea is that the pressure plate pushes the crankshaft against the thrust bearing towards the passenger side right? In the service manual there is a page on "measuring axial clearance" with a dial bore gauge with a clearance of 0.07-0.23mm and wear limit of 0.30mm. I really wonder if this measurement can be done outside the engine using the clutch to push the crank.

Though I might be over my head here...someone who knows what they are talking about chime in.

I'd use a dial indicator on a mag mount.

 

[Parabola]

what would be the course of action if crank axial play measures near the .3mm wear limit?

At that point you’d have to open up the bottom end of the engine to figure out if the thrust washer has fallen out or it had excessive wear. Either way it’s a pain in the a**.