Possiable machine shop problems.....part II - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 07-31-2000, 03:06 PM
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Possiable machine shop problems.....part II

I took my 350 4bolt main block back to the machiene shop to have the seam checked where the main bearing meets the block. They said that the slight seam I was feeling was OK, they measured it like the other machiene shop did and said it was within tollerance. However, before I took it to them I installed the crank but had the caps in the right order (I guess it was the right order, since they arent numbered and the seam wasnt as noticeable in this order). I plastigauged it and I came up with #4 cap being a little too tight about .001 or maby a little less. The other caps were on the tight side, but within limits.
the specs I was using came from the Haynes manuel and are as follows:
1-.0008-.0020
2,3,4-.0011-.0023
5-.0017-.0032
Rods-.0013-.0035
I took them the crank and the bearings with the plastigauge still stuck to them and they agreed that #4 was looked a little too tight. He said they would check the clearance with ?a dial indicator? (I think) but it would probially would be alright. Does anyone know if he is feeding me a load of crap, or does the plastigauge not always tell the truth?
Thanks,
Mike

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post #2 of (permalink) Old 07-31-2000, 08:08 PM
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Re: Possiable machine shop problems.....part II

Well, Plastigauge is only accurate to .0005". So if your Plastigauge is showing .001" it could be that you have .0005" to .0015". I use Plastigauge to let me know if all the journals are the same size. If you have one Plastigauge streak wider or narrower than the other Plastigauge streaks on a crank then there is reason to measure with a more accurate tool. It's kinda easy to see a Plastigauge streak that is a touch wider or a touch narrower when looking at them all at the same time.
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post #3 of (permalink) Old 08-01-2000, 08:12 AM
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Re: Possiable machine shop problems.....part II

So if they call me and say it is OK the way it is, it really is (or could be)?
Thanks,
Mike

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