Re: Valve tappet adjustment

Posted by Andy Martin on March 10, 2004 at 17:35:42 from (67.248.199.137):

In Reply to: Valve tappet adjustment posted by CNKS on March 09, 2004 at 14:44:44:

Interesting. I've never bothered to check a cam in the "closed" position.

I used to always set them at idle but am too old to ignore the flying oil anymore.

The easy way on all engines is like was said, is to set a valve when it's mate is fully open. I never can find chalk so I just go around a couple of times to recheck myself, and I always set them a little loose.

I do have several tractors with rocker arms which have holes worn in them (the reason for this post) by the valve stems. The only way I have found to set them is by the "turn of the screw". Screw the adjuster in until the rocker tightens up, then back off enough turns (about 1/4 turn on an M) until you get enough clearance to not burn a valve.

These worn rockers should be replaced, but if anyone tries to adjust one with a feeler gauge he will be off by the amount of the depression worn into the rocker. I have a '39 M with probably 0.100" depression worn in every rocker but runs smooth as glass when the valves are set right, even with the bad rockers.

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