Mark Anderson

Metal particals in the filter are never good and probably not repairable at least not cost effectively. We do have this option available:
https://rennlist.com/forums/showthre...t=cheap+engine

Big Dave

Thanks, Mark. I'll let him know.

Curt

Have you guys looked at the timing belt to make sure it didnt slip or something. Sounds like the belt is still on since you can turn the motor over a bit but maybe it slipped and its causing valves to hit the pistions. but with all that metal in the oil filter I would imagine a spun bearing and a broken rod at the crank.

Deb

This aint a funny topic and I wish them the best on the diagnosis/fix but ya gotta laugh at the funny bits! John's reply about "hearing jacks all over the world" - I can just picture thousands of screen doors slammin' with guys in various stages of dress tearin' out the door with arms full of wrenches and sockets draggin a floor jack towards the garage while the SO just looks on sayin' " here goes anuther weekend"
Thanks for the imagery John.

Big Dave

The timing belt appears to be in good shape. We can see it through the holes on top of the covers, and everything moves when the crank is moved (again, it only moved at most 1/8th of a turn or less). This is no guarantee that it hasn't jumped or slipped. It's not shredded.

If it is a spun bearing, what could cause that to happen?

Dave

John Struthers

Oil starvation, ask Mark A.
Over-revving, missed shift, lame oil pump, detonation:see oil starvation, talk to Mark A. and Crew.
Other than racing, long high speed sweepers, tight turns with associated HIGH RPM, and a few sad tales from long runs at high speed on the Autobahns I haven't heard of anyone losing an engine to spun bearings.
Mark used to have a development blurb for the drilled cranks in the early catalogs.
They had tried a number of things after losing a few engines.
Devek may have additional/supporting info as well.

Zandramus

Dave,

I am curious as to whether you have gotten the pan off yet , and if so what you have found on the bottom end?

heinrich

Porsche 928 Auto + seized crank + metal shavings = TBF.

Porsche 928 + metal shavings in filter = Needs Engine Replaced or at the very least pulled. No way around this, pull it.

heinrich

One more thing: Torque Tube replaced 1 year ago .... Excellent chance of TBF.

Big Dave

Oil pan is not off yet. Not sure when surgery will begin. I think we'll be soliciting volunteers at our monthly meeting on Thursday.

Mike S

I know you said that the timing belt was still on, but can you check to see if the timing marks are correct. Maybe you jumped a tooth or three on the belt and you are hitting piston against valve, which is preventing you from rotating the motor.

Yes, I'm a 944 guy....but I beleive this procedure should hold true for you 928 guys as well.

Lizard928

Mike the procedure is nearly the same for the 944 and 928, although if the porsche tech attached a wrench and hung off the wrench and it is the valves then the valves have been bent,

OrionKhan

Again...I'm not expert, but I have to agree with Heirich. Unfortunately from personal experience....sounds like TBF...

Gretch

Dave, Without using excessive force, See if there is any fore/aft play in the crank shaft, buy using a rubber mallet on the crank pulley and lever (between the block and the crank pulley). Be gentle and watch closely. The likely movement will be in, towards the block, so start with the mallet first. If you see significant aft movement of the crank, the TBF diagnosis has gained significant credibility.

Am I mistaken, or is this car a 5 speed? Earlier, I discounted TBF because I thought the car was a 5 speed and that TBF happens to automatics only.

Big Dave

It's an automatic. I'll be seeing Rob tomorrow night with a copy if this thread for him.