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Bellhousing alignment.

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Javelin69 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Javelin69 Quote  Post ReplyReply Direct Link To This Post Topic: Bellhousing alignment.
    Posted: Sep/23/2017 at 11:00pm
I've got a 390 & T-10 Javelin I've had many years. Put a couple clutches in it no problem. Several years ago I had the motor rebuilt and since have had issues with pilot bushings. Finally figured out the input shaft was worn so I had a custom bushing made undersized and things worked out pretty well. Now I just had the trans gone thru and at this time had the input shaft resurfaced to factory size. I told the guy who is reinstalling it about my bushing issues suggesting he check the Bellhousing alignment. Today he calls Telling me that it's 50 thou out of concentric (he did not check parallel). My questions are these:
-how could it be that far out and not give trouble before the engine work?
-suppose something could have changed because of the engine rebuild?
-the tsm states runout can be changed by changing face alignment as long as .010 isn't exceeded for either. Is it possible shimming could correct my issue?
-outside of replacing the bell, any ideas to correct this?
-this seems so much more than what others call misalignment should I suspect a flaw in his measuring?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote purple72Gremlin Quote  Post ReplyReply Direct Link To This Post Posted: Sep/23/2017 at 11:43pm
have the dowel pins???
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Javelin69 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Javelin69 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/24/2017 at 8:09am
The pins are in. If my math is correct 50 thou is 1/20th of an inch. Hard to believe if they were defective it could be out that much.
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1948kaiser View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1948kaiser Quote  Post ReplyReply Direct Link To This Post Posted: Sep/24/2017 at 9:05am
is the block plate on when checking this?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Raccoonman Quote  Post ReplyReply Direct Link To This Post Posted: Sep/24/2017 at 9:14am
I'm thinking in the other direction. My suspicion would fall on the crankshaft being ground off center, throwing the bushing bore out of concentricity. The rest of the physical dimensions can't change as they're never modified. Check the radial run-out of the bushing bore.
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Javelin69 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Javelin69 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/24/2017 at 9:22am
When you say that about the crank, do you mean when it was turned during the rebuild that the journals somehow were ground offset, or the bushing bore was never properly located? I did notice the bushing bore seemed a little rough. Could that have happened when the crank was turned?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red Devil Quote  Post ReplyReply Direct Link To This Post Posted: Sep/24/2017 at 10:04am
Check parallelism first. Paint, debris, surface defects, etc. on block, block plate or bell can throw off the parallel alignment which changes the concentric alignment.  Assume the 0.050" was TIR?  

Check and adjust concentric alignment only after making sure parallelism is in spec.(a good shop would have done this). Mine was out on an aftermarket bell and needed shims to correct parallelism and modified alignment sleeves to correct the concentricity.   

If parts are still at the machine shop, best to get them to machine the parts to suit, if you're confident in the shop.  

Hope this helps, RD
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Javelin69 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Javelin69 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/24/2017 at 10:23am
What did you use for sleeves?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 6PakBee Quote  Post ReplyReply Direct Link To This Post Posted: Sep/24/2017 at 10:26am
Originally posted by Red Devil Red Devil wrote:

.... Assume the 0.050" was TIR?.....


That's the million dollar question right there.  0.025" misalignment is still a lot but much different than 0.050".
Roger Gazur
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Red Devil View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red Devil Quote  Post ReplyReply Direct Link To This Post Posted: Sep/24/2017 at 10:33am
I ground the stock sleeves on one side to allow the bell to move toward centre until had alignment right with bolts torqued.   Then drilled holes in the flange of the bell and into the block to fit smaller dowel pins for easier alignment in the future.  

Some vendors may sell offset dowel sleeves, but not sure who?  Could check with Jody's Transmission?   If it's at the machine shop, they should be able to align it and machine for small dowels - but make sure they check parallel alignment first.   Parallelism can be corrected by machining the face of the bell or the block, depending which is off. There is some variation block-to-block, so always best to check. 

Hope this helps,RD 
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