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Thrust bearing failure (TBF) when is it absolutely critical?

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Old 06-24-2010, 01:34 PM
  #16  
blown 87
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This thrust bearing had .012" of end play, in specs but as you can see not long for this world.

Old 06-24-2010, 08:00 PM
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Hayk928
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Thanks guys,

point is that my engine still turns over smooth, starts and sounds normal. I'll have to say, I do have a very good ear for all mechanical stuff - that's my fate... Except the endplay there's absolutely nothing strange on that motor - even two old friends from German pff (both long-term mechanics and shark specialists) listened and drove my shark and were very positive how good the engine is responding etc.

Anyway, I'm crying in my beer...
Old 06-24-2010, 08:07 PM
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Hayk928
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Additional query:

Are there some better replacements for the OEM-bearing? Can you get them over sized?

I dunno have the money for doing lots of experiments, so my question is, should I put the bucks on replacing the bearings OR on a spare engine (from which I also don't know the true condition unless I open it)? Is it possible to check it without pulling the engine (by removing the front axle)?
Old 06-25-2010, 07:11 AM
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Hi Hayk928,

At this point the safest and most prudent thing to do is to pull your engine and tear it down to see what you've got. Trying to save time/money by doing it in the car will not save you either in the long run since a correct rebuild of the engine will require it to be pulled. This is even if there is no block damage.

Good luck,
Old 06-25-2010, 11:16 AM
  #20  
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Originally Posted by Constantine
Hi Hayk928,

At this point the safest and most prudent thing to do is to pull your engine and tear it down to see what you've got. Trying to save time/money by doing it in the car will not save you either in the long run since a correct rebuild of the engine will require it to be pulled. This is even if there is no block damage.

Good luck,
I agree, not a chance that you can split the girdle and put it back together with it in the car, all the rods hanging down, the heavy crank to hold up, getting the girdle on is not going to happen correctly with the block in the car.

It is hard enough to do with it on a stand with the heads on.
Old 06-25-2010, 12:00 PM
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dcrasta
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There was a thread on Pelican where someone did bearings without removing the motor. In the end he 'admitted' it was much more difficult without pulling the motor. You could be approaching the limits of the freeplay. If its driving and running well now, I would take that as a sign that 'I have a few moments left before it goes downhill'...
Old 06-25-2010, 12:05 PM
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Originally Posted by dcrasta
There was a thread on Pelican where someone did bearings without removing the motor. In the end he 'admitted' it was much more difficult without pulling the motor. You could be approaching the limits of the freeplay. If its driving and running well now, I would take that as a sign that 'I have a few moments left before it goes downhill'...
I Bet it leaked at the crank girdle and the crank got dinged up.
It takes about four folks to hold the rods out of the way when you put the crank in to keep the rod bolts from hitting the crank.
I will not do another one with the heads on it, but it can be done.



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