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UTS Restoration Cont. #3

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skycarp

11-02-2007 19:33:05




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I am restoring 1945 UT with KEF engine.

The engine was not running when I got it, and was out in the rain and snow for 8 years. A lot of rust was showing inside the engine when I opened it up. The cam looked rusted over but it cleaned up with a pressure washer and solvent gun. One lobe on the cam looks to be scored, but the rest look ok.

How do you determine if the cam is bad?

Who can you recommend to check the cam and regrind it if needed?

What does regrinding a cam entail?

Thanks for any replies.

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skycarp

11-05-2007 18:03:27




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 Re: UTS Restoration Cont. #3 in reply to skycarp, 11-02-2007 19:33:05  
I mic'ed the cam today. The highest lobe was 1.92 and the lowest was 1.17. What a variation!

I found a machine shop in Washington State that will build up the worn lobes with cast iron rod and then turn them down to specification, what ever specification is. I am trying to find out what the specificatin is for a new KEF cam. Anyone know?



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T.R.K.

11-03-2007 18:10:07




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 Re: UTS Restoration Cont. #3 in reply to skycarp, 11-02-2007 19:33:05  
To check your cam, take a micrometer or a vernier or dial caliper and compare that worn lobe to another similar lobe-either intake or exhaust to see how badly it is worn. The intakes will be #2,#3,#6,#7. Exhausts will be #1,#4,#5,#8.

I recall on the first MM Z I overhauled, my local welder welded up a worn lobe on that cam with hard facing material and I ground it and polished it to match the others. It ran pretty well.

(It was really hard material too. Would take the edge right off a sheet of emery cloth in a hurry.)

None of the lobes on a 40+ year old cam will measure exactly the same. They should be within about .010 or .015 though.

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