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I saw this on ebay. The seller was listing used 928 motors and this photo appeared in the ad. What would cause this kind of damage to the nose of the crank? It couldn't be just a loose balancer because it's beat up all over, from front to back
FWIW, I would be extremely cautious about using emery or other cloth to try and "correct" the raised edges of those impact gouges, as it appears to have been done. That diameter really needs to be large enough to support the pulley hub that rides there.
With both of those things in mind, it's possible that a bonehead "mechanic" used a chisel to raise metal enough to support a pulley that had been spinning on the crank nose. Look at the bore in the pulley and see if it shows evidence of wear caused by not having the bolt tight, or more commonly caused bt having the washer on backwards. If such evidence exists, start with a good replacement pulley and see how it fits on the crank nose. It needs to be pretty much a zero-zero fit, no play and no interference.
I can understand a bozo trying to rotate the crank with a pipe wrench but this engine is at a recycler yard and you would think they would know better. The gouges don't seem to be uniform in any way, not parallel and not longitudinal to the nose so I don't think a pipe wrench did this but it SURE isn't 'natural causes'.
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
The damper doesn't touch that part of the crank. Only the A/C pulley and the accessory pulley touch that surface.
It is interesting to sit and think about how this happened. There's some marks that look like a pipe wrench touched it. But all those other dents and gouges in all different directions...what did all of that?
And more importantly.....why?
When I grew up and through most of my life.....everyone threw away their junk....there was no reason to keep it, since it was junk and you couldn't use it.
Ebay changed that. Now, instead of throwing junk away, people post it on Ebay and hope some dumb a$$ buys it. There's almost no such thing as "junk" these days.
Ebay changed that. Now, instead of throwing junk away, people post it on Ebay and hope some dumb a$$ buys it. There's almost no such thing as "junk" these days.
Well said. I bought a propeller hub off ebay a few months ago. He promised it was servicable. I looked at it, and it was questionable. Two prop shops rejected it. Seller wouldn't take it back. Money gone.
If that's a "candidate" engine at a parts breaker/recycler, keep looking. Thrust bearing failure reported in a car, or the car comes in with the pulley off 'cuz the timing belt broke. There's no other reason for a boneyard engine to have that stuff removed. If they did rotate a 32V with anything and belt off, they likely bent valves. Even without the snout damage, you'd be checking endplay and doing a dry leakdown test to see what really went wrong. Meanwhile, run...
09-21-2018, 03:14 PM
What would do this to the crank?
