engine thrust bearing repair
10-26-2010 | 01:14 PM
#31
Team Owner
Joined: May 2004
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From: Philly PA
10-26-2010 | 05:16 PM
#32
Nordschleife Master
Joined: Jun 2006
Posts: 6,286
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From: ɹəpun uʍop 'ʎəupʎs
Depends what you want out of your budget 
If you want a running car as cheaply as possible, do not buy a TBF car. Buy one that runs - you'll come out ahead by thousands, given that running S4's are so cheap anyway. Splitting the girdle will cost you $$ for all the WYAIT's, and you'll likely just find that you still need to buy another engine of unknown provenance.
If you want a chassis for a GM engine conversion, then TBF is a good option, as you'll save some $$.
If you only have a $2k budget, buy a running early car, not a TBF S4.
If you want a running car as cheaply as possible, do not buy a TBF car. Buy one that runs - you'll come out ahead by thousands, given that running S4's are so cheap anyway. Splitting the girdle will cost you $$ for all the WYAIT's, and you'll likely just find that you still need to buy another engine of unknown provenance.
If you want a chassis for a GM engine conversion, then TBF is a good option, as you'll save some $$.
If you only have a $2k budget, buy a running early car, not a TBF S4.
Talked to the guys mechanic -- and he said it has a TBF,
not sure of the extent of the failure.
I have the means to pull the engine --
does the case have to be split to perform the repair?
or can all the work be done engine out but otherwise still together.
Or is this a case by case scenario?
thx,
M
not sure of the extent of the failure.
I have the means to pull the engine --
does the case have to be split to perform the repair?
or can all the work be done engine out but otherwise still together.
Or is this a case by case scenario?
thx,
M
10-26-2010 | 05:46 PM
#33
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They have repaired blocks here, what they do is weld up the ground away area and then send it for machining. The place that bores my blocks does it and I asked how did it go and he said. "Well I haven't heard back from them, so that is a good sign."
That is all I know but it isn't cheap.
Greg
That is all I know but it isn't cheap.
Greg
10-26-2010 | 08:45 PM
#34
Three Wheelin'
Joined: Jun 2008
Posts: 1,914
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From: Surprise, Arizona
The heat generated by the crank contacting the block is going to cause problems either right away or sometime down the line. Unless it's just a thrust bearing replacement (extremely light wear and not at all into the block) you are asking for trouble WITH A CAPITAL T... Until good engine blocks just can't be found anymore, repairing a damaged block is [CENSORED].
Why go to all the labor and cost of this extensive, complicated repair when a used block is MUCH cheaper than the precision man hours required to perform such a repair? Plus the repair you end up with will always be questionable to yourself and anyone you might wish to sell the car to down the line. I can see if you are 17 years old trying to get a 928 going with NO money whatsoever (except for JB weld, bailing wire, duct tape, and super glue funds)... Even then, it will be broken and parked soon enough from something else anyways...
Build the motor right and then install a Black Sea R&D Clamp to prevent it from happening again....SHEESH!
Why go to all the labor and cost of this extensive, complicated repair when a used block is MUCH cheaper than the precision man hours required to perform such a repair? Plus the repair you end up with will always be questionable to yourself and anyone you might wish to sell the car to down the line. I can see if you are 17 years old trying to get a 928 going with NO money whatsoever (except for JB weld, bailing wire, duct tape, and super glue funds)... Even then, it will be broken and parked soon enough from something else anyways...
Build the motor right and then install a Black Sea R&D Clamp to prevent it from happening again....SHEESH!
Last edited by 86'928S MeteorGrey; 10-26-2010 at 09:12 PM.
11-07-2016 | 09:46 AM
#36
Rennlist Member
Joined: Nov 2010
Posts: 1,283
Likes: 72
From: Southern Maryland
Sorry to hear about your situation. I too had similar circumstances and chose a different path. I have attached the thread. Car is currently my daily driver with no noted complications. I do understand that it is on the down hill side of the engines life expectancy, but over 2,000 miles so far.
https://rennlist.com/forums/928-foru...t-to-lose.html
Hope this helps
Best,
John
https://rennlist.com/forums/928-foru...t-to-lose.html
Hope this helps
Best,
John
11-07-2016 | 02:47 PM
#38
Chronic Tool Dropper
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From: Bend, Oregon
Six year old thread revival by a spam-bot. Points for persistence, 2x negative for method and intent.
One might think...
But it isn't as easy as unbolting the heads from the thrust bearing TBF engine to use on the timing belt TBF engine. The grinding of the bearing and subsequent wear and ultimate fracture of the main bearing web means lots of particles swimming in the oil system. So one would want to disassemble the donor heads completely, paying particular attention to oil galleys and the lifters to make sure that you aren't swapping a simple problem with a few bent vales for the major problems that come with oil system contamination. Not saying it wouldn't be a good idea, just suggesting that it's not always a simple solution.
One might think...
But it isn't as easy as unbolting the heads from the thrust bearing TBF engine to use on the timing belt TBF engine. The grinding of the bearing and subsequent wear and ultimate fracture of the main bearing web means lots of particles swimming in the oil system. So one would want to disassemble the donor heads completely, paying particular attention to oil galleys and the lifters to make sure that you aren't swapping a simple problem with a few bent vales for the major problems that come with oil system contamination. Not saying it wouldn't be a good idea, just suggesting that it's not always a simple solution.
11-07-2016 | 08:10 PM
#39
Former Vendor
Joined: Feb 2005
Posts: 15,230
Likes: 2,489
From: Anaheim
Six year old thread revival by a spam-bot. Points for persistence, 2x negative for method and intent.
But it isn't as easy as unbolting the heads from the thrust bearing TBF engine to use on the timing belt TBF engine. The grinding of the bearing and subsequent wear and ultimate fracture of the main bearing web means lots of particles swimming in the oil system. So one would want to disassemble the donor heads completely, paying particular attention to oil galleys and the lifters to make sure that you aren't swapping a simple problem with a few bent vales for the major problems that come with oil system contamination. Not saying it wouldn't be a good idea, just suggesting that it's not always a simple solution.
But it isn't as easy as unbolting the heads from the thrust bearing TBF engine to use on the timing belt TBF engine. The grinding of the bearing and subsequent wear and ultimate fracture of the main bearing web means lots of particles swimming in the oil system. So one would want to disassemble the donor heads completely, paying particular attention to oil galleys and the lifters to make sure that you aren't swapping a simple problem with a few bent vales for the major problems that come with oil system contamination. Not saying it wouldn't be a good idea, just suggesting that it's not always a simple solution.
The lifters will "catch" huge quantities of ground up metal debris, once the oil filter bypasses.
