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Antique Gas Engine Discussion

Rod Bearing Clearance for IHC M

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Old 04-27-2005, 12:17:03 PM
W. Bittle W. Bittle is offline
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Question Rod Bearing Clearance for IHC M

What is the rod bearing clearance needed for an IHC M 1 1/2 HP. I put new rings in the beast and had the piston out. In taking the rod cap off I noticed that there were six shims on the top and 3 on the bottom. I'm not sure if someone else messed with this in the past. Would have figured that the shim count would be equal, or no more than one off. The rod nut cotter keys looked like they had been re-used. So I am a little worried that the shims are not right. Bought some Plastigage today, but do not know what the clearance should be.

Believe it or not, but Plastigage is hard to find! No one rebuilds engines any more. In fact the "kid" at the parts counter did'nt even know what I was talking about at one store. Wanted to sell me a set of feeler gauges
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Old 04-27-2005, 12:39:07 PM
Jim Tremble Jim Tremble is offline
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Default Re: Rod Bearing Clearance for IHC M

A general rule of thumb, Oil = .0015-.003" and Grease .003"-.005". If you get within these limits, you will be OK.

Hope it helps,

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Old 04-28-2005, 11:02:01 AM
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Elden DuRand Elden DuRand is offline
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Default Re: Rod Bearing Clearance for IHC M

Originally Posted by Jim Tremble
A general rule of thumb, Oil = .0015-.003" and Grease .003"-.005". If you get within these limits, you will be OK.

Hope it helps,

Another reasonably good way to set bearing clearance is to remove shims until, with the bearing cap tight, a slight drag can be felt in the bearing. The drag means that there is zero clearance.

Now, just add enough shims back to the pack to get your clearance. Works for me and, yeah - Plastigage is hard to find nowadays.

Take care - Elden
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