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  #21  
Old October 26th, 2013, 03:33 PM
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transientmechanic
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Adam
1972 SIII
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Do you know the history of the motor at all?

Truthfully its probably not a huge concern... we're certainly not talking about a race engine here. Slap it together, run it, and work out the kinks. Or tear the whole thing down and rebuild it with new bearings, rings, valves, valve guides, planed head, etc. Theres not much middle ground between those two options.
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  #22  
Old October 26th, 2013, 04:26 PM
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Jeff Payne
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Fair enough.

I was told it was in good running condition when it was pulled. I started in the front to do the timing belt and as soon as I took off the water pump I got a little concerned as it had a some rusty sludgy gunk inside and from then on I just saw more things that were of concern. Like I said, I have never done any of this before. I'm not sure when I see something if it is in good or bad shape
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  #23  
Old October 26th, 2013, 06:15 PM
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Robert Davis
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Hey Jeff, if you still have my number can talk you through the air cleaner piece if you need any help and will be glad to send a few pictures.

We should probably also have a fuel routing discussion that will save you countless hours.

PM if interested, or call.
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  #24  
Old October 26th, 2013, 07:53 PM
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Bill Adams
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That rust is probably from the impeller on the water pump.
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  #25  
Old October 26th, 2013, 08:40 PM
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Mike
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Before the re-build it felt like it had a little bit of movement but really not that bad. After I had a turbo re-built the play, cold, was almost non existent. I was told that it was ready for a failure?
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  #26  
Old October 27th, 2013, 12:21 AM
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Ed
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Cold or hot, a turbo with proper bushings should have no play side to side. It can have a very small (read: almost unnoticeable) amount of axial (in/out) play, but it really should have none.

Any side to side play means the bearings are dead and is a sure sign for rebuild.
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  #27  
Old October 27th, 2013, 09:41 AM
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Skinny Pete
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Really? Good luck with that theory. How will the shaft get lubricated?

Quote:
Originally Posted by sonoronos View Post
Cold or hot, a turbo with proper bushings should have no play side to side. It can have a very small (read: almost unnoticeable) amount of axial (in/out) play, but it really should have none.

Any side to side play means the bearings are dead and is a sure sign for rebuild.
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  #28  
Old December 6th, 2013, 10:47 AM
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Hey Dave,

Sorry I never replied back to your post - journal bearing turbo shaft play specs I have seen are typically ~0.006" radial and ~0.003" axial. Most times I have seen that level of tolerance, it has been difficult to perceive by finger movement. I guess maybe "no shaft play" isn't exactly the right word, but in assessing turbos, best to rebuild the ones you can wiggle by hand

The oil film lubrication occurs hydraulically much in the same way oil lubricates the main bearings on an engine crankshaft, which also have very small bearing clearances.
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