engine thrust bearing repair - Page 2

Landseer · 11-04-2009, 10:28 PM

Have them drop the oil filter into a separate clean container.

Look for metalflake in the oil that dumps out of the filter. No need to drop pan initially.

There are other things that can cause it to stall.

88porsche928 · 11-04-2009, 10:36 PM

he said he found small amounts of copper and small amounts of almuminum in the oil filter

Landseer · 11-04-2009, 10:39 PM

OK, and I saw doc mirror's note on seized.

docmirror · 11-05-2009, 02:05 AM

If it stays seized it's more likely the 2/6 rod bearing. Usually, the thrust bearing will loosen up when it cools.

Dropping the pan is a major job because of the crossmember. It's almost easier to pull the engine. Since it's seized, you'll need to take the engine out anyway, and the motor mounts can be replaced from above then.

If the mechanic has a borescope, he can try getting through the oil filler, but he'll need to remove the baffle under there first.

88porsche928 · 11-05-2009, 10:36 AM

if its the 2/6 rod bearing is it possible to be repaired

Andrew Olson · 11-05-2009, 10:49 AM

It's possible. But it's too early to tell. There could be a LOT of other damage.

At a minimum, you'll need a new crank, 2 new rods, rod bearings, head gaskets, and lot's of labor.

I heard 928 Int'l is going to have a 1/2 off used parts sales this December... Might be cheaper to get a used engine. Just a thought.

88porsche928 · 11-05-2009, 11:14 PM

bad news he called me and told me the flex plate was bowed out and the crankshaft was pushed forward, im already planning to get a used engine, he said on monday will will try and see if we can save the engine

Landseer · 11-05-2009, 11:48 PM

Tell him you need a number for crankshaft endplay, we are curious.
5 thou?
10 thou?
More?

88porsche928 · 11-06-2009, 02:17 AM

land seer thanks for the post, i will ask him on monday, do you think the engine is the only thing gone at this point or will the transmission need to be replaced too?

Imo000 · 11-06-2009, 10:37 AM

Quote:

Originally Posted by Andrew Olson

........At a minimum, you'll need a new crank, 2 new rods, rod bearings, head gaskets, and lot's of labor.............

Unless the crank is really bent/craked form heat or damaged beyond repair, it can (as done frequently with other engines) be re ground to accept oversized bearings and the connecting rods can be easily re-sized too. This is done all the time in the engine rebuild business. the reall issue is, how long did hte engie run with all the metal particles in it and did that couse any other damage.

Constantine · 11-06-2009, 12:14 PM

Thrust bearing failure (TBF) is a very real problem for 928 automatics as this unfortunate story tells. The owner now has to decide how much to spend on trying to fix the engine or get another one, with both options ending up to be an expensive proposition any way you go.

Not to mention the down time of not having the 928 to drive, which is often months. At this point some opt to part the car and go on.

These scenarios happen more often than most realize. That's why it is very important to not only check for and release the front flexplate tension but to stop it from returning. There are different options now available.

Our Super Clamp was designed to be the very best solution at the time we designed it and we still feel it is the best out there to stop drive shaft pullout which can lead to TBF. A worthy upgrade while your doing a torque tube R&R. This is where being a bit cheap at that time can cost a lot more later.

All that being said we hope this story has a happy ending for the owner and his 928.

With our condolences,

docmirror · 11-06-2009, 03:56 PM

I'm betting the PO knew, and just screwed the buyer.

blown 87 · 11-06-2009, 10:50 PM

Quote:

Originally Posted by docmirror

I'm betting the PO knew, and just screwed the buyer.

Not a bet I will take.

11-04-2009, 10:28 PM	#16
Landseer Addict Rennlist Member Join Date: Sep 2007 Location: Richmond, VA Posts: 2,199	Have them drop the oil filter into a separate clean container. Look for metalflake in the oil that dumps out of the filter. No need to drop pan initially. There are other things that can cause it to stall. __________________ 83 944 2x84,5,6 928s

11-04-2009, 10:39 PM	#18
Landseer Addict Rennlist Member Join Date: Sep 2007 Location: Richmond, VA Posts: 2,199	OK, and I saw doc mirror's note on seized. __________________ 83 944 2x84,5,6 928s

11-05-2009, 02:05 AM	#19
docmirror Shameful Thread Killer Rennlist Member Join Date: Aug 2004 Location: Ah Luv Ewe, Foat Wuth, Teyxas! Posts: 5,542	If it stays seized it's more likely the 2/6 rod bearing. Usually, the thrust bearing will loosen up when it cools. Dropping the pan is a major job because of the crossmember. It's almost easier to pull the engine. Since it's seized, you'll need to take the engine out anyway, and the motor mounts can be replaced from above then. If the mechanic has a borescope, he can try getting through the oil filler, but he'll need to remove the baffle under there first. __________________ Doc 90GT, red/tan. FIXED - thx Sean! 86.5, red/blk. I'm just a 'Pabst swilling unibrow'. You know Doc? Sometimes when you post you seem like the BIGGEST prick I have ever had the (un)fortunate opportunity to read from. Brendan Advice or expressions provided by me are for entertainment purposes only. Nothing here is to be used as professional, or legally binding authority by any persons or businesses. I reserve the right to alter, revise, or delete any statements at any time.

11-05-2009, 10:49 AM	#21
Andrew Olson Supercharged Rennlist Member Join Date: May 2002 Location: M-F Ohio. S-S Michigan. Sucks, but I'm gettin' paid! Posts: 12,747	It's possible. But it's too early to tell. There could be a LOT of other damage. At a minimum, you'll need a new crank, 2 new rods, rod bearings, head gaskets, and lot's of labor. I heard 928 Int'l is going to have a 1/2 off used parts sales this December... Might be cheaper to get a used engine. Just a thought. __________________ AO

11-05-2009, 11:48 PM	#23
Landseer Addict Rennlist Member Join Date: Sep 2007 Location: Richmond, VA Posts: 2,199	Tell him you need a number for crankshaft endplay, we are curious. 5 thou? 10 thou? More? __________________ 83 944 2x84,5,6 928s

11-04-2009, 10:36 PM	#17
88porsche928 User Join Date: Sep 2007 Posts: 164	he said he found small amounts of copper and small amounts of almuminum in the oil filter

11-05-2009, 10:36 AM	#20
88porsche928 User Join Date: Sep 2007 Posts: 164	if its the 2/6 rod bearing is it possible to be repaired

11-05-2009, 11:14 PM	#22
88porsche928 User Join Date: Sep 2007 Posts: 164	bad news he called me and told me the flex plate was bowed out and the crankshaft was pushed forward, im already planning to get a used engine, he said on monday will will try and see if we can save the engine

11-06-2009, 02:17 AM	#24
88porsche928 User Join Date: Sep 2007 Posts: 164	land seer thanks for the post, i will ask him on monday, do you think the engine is the only thing gone at this point or will the transmission need to be replaced too?

11-06-2009, 12:14 PM	#26
Constantine Basic Sponsor Rennlist Site Sponsor Join Date: Feb 2004 Posts: 1,121	Thrust bearing failure (TBF) is a very real problem for 928 automatics as this unfortunate story tells. The owner now has to decide how much to spend on trying to fix the engine or get another one, with both options ending up to be an expensive proposition any way you go. Not to mention the down time of not having the 928 to drive, which is often months. At this point some opt to part the car and go on. These scenarios happen more often than most realize. That's why it is very important to not only check for and release the front flexplate tension but to stop it from returning. There are different options now available. Our Super Clamp was designed to be the very best solution at the time we designed it and we still feel it is the best out there to stop drive shaft pullout which can lead to TBF. A worthy upgrade while your doing a torque tube R&R. This is where being a bit cheap at that time can cost a lot more later. All that being said we hope this story has a happy ending for the owner and his 928. With our condolences, __________________ Constantine Black Sea R&D 772-713-1289 928 Torque Tube (TT) Super Bearings - Rebuild your own TT to better than new specs! 928 Front Flex Plate Super Clamp - Save your engine from thrust bearing failure, all 928 automatics! Free TT rebuilds - Contact us for info! 924/944/968 TT rebuild parts coming soon!

11-06-2009, 03:56 PM	#27
docmirror Shameful Thread Killer Rennlist Member Join Date: Aug 2004 Location: Ah Luv Ewe, Foat Wuth, Teyxas! Posts: 5,542	I'm betting the PO knew, and just screwed the buyer. __________________ Doc 90GT, red/tan. FIXED - thx Sean! 86.5, red/blk. I'm just a 'Pabst swilling unibrow'. You know Doc? Sometimes when you post you seem like the BIGGEST prick I have ever had the (un)fortunate opportunity to read from. Brendan Advice or expressions provided by me are for entertainment purposes only. Nothing here is to be used as professional, or legally binding authority by any persons or businesses. I reserve the right to alter, revise, or delete any statements at any time.