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Old 01-10-2008, 07:20 AM
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Gear Drive to Timing Cover Clearance

So last night I was installing a summit timing gear drive set and I ran into a problem with clearance to the timing cover.

The timing cover is a polished aluminum piece that is designed to work with this gear set.

First I installed the timing gear and set the cam all the way back in the motor, then I installed the crank gear, made sure they were lined up and installed the idler gears as per instructions,

For those who don't know...the idler gears have a thrust button between the big idler and the block and you are supposed to adjust the clearance by machining the timing cover. It seems backwards but if you change the thrust button the gears won't line up with cam gear. Anyways...

Without the timing cover everything is perfect all lined up beautifully, but when I put the cover on I have -.185 clearance between the cover and the idler gear shafts. Normally I wouldn't think twice and machine clearances in the timing gear. However the cover is only .110 thick.

Can anyone recommend a reasonably priced timing cover that worked for your timing gear drive setup. I prefer polished aluminum but I am open for anything.
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Last edited by Double_v23; 01-10-2008 at 07:30 AM.
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Old 01-10-2008, 10:16 AM
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Gear Drive to Timing Cover Clearance

i ran in the same problem on my motor
i took and put a 150 thou shim on the idlers front
installed cover without the gasket using valve cover studs you get with the T bars .
placed washers and nuts on and tightened down snugly .
heated the front of cover with a heat gun for about two hours .
not a torch .
tightened the nuts little by little till no gap at mate-ting service .
let it cool down .
removed shims and added gasket and bolted it back on .
it didn't crack and didn't leak .
i'm sure theres a cover that fits right , but
this was my route .
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Old 01-10-2008, 10:24 AM
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That is some true ingenuity...I never even considered it. It was an aluminum cover?

Also how did you clear the idler shaft on the opposite side? I think that if you only do one side then the gears will be skewed a little .
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Old 01-10-2008, 10:35 AM
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Gear Drive to Timing Cover Clearance

yes it was the alum cover .
ended up with .008 thou gap .
that lets it float enough between block and cover .
if it was the stock metal cover ,a hammer with a piece of wood
will do as instructions say to do.
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Old 01-10-2008, 11:11 AM
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I just talked to summit and they said that they recommend using a stamped steel cover because they are thinner. Worth a shot I guess.
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Old 01-11-2008, 12:08 PM
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So I went out and got a cheap Mr. Gasket cover and it bolted right up, the clearance between the idler and cover was .015 and I had to shim the cam button .030 to bring the cam endplay into spec I gues I will just hang on to the other cover for awhile, I am sure I will need it soon enough.

Thanks for the advice though.
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