Re: Tips for checking M valve clearance?

Posted by Bill Smith on July 08, 2001 at 15:09:52 from (128.242.4.59):

In Reply to: Tips for checking M valve clearance? posted by Lowell Davis on July 06, 2001 at 12:06:12:

I worked in a automotive shop for awhile and found a neat little trick for finding compression stroke. we had a deal that had the same threads as a spark plug and had a rubber hose and a whistle on it. You could very gently turn engine over tell the whistle made noise and when the whistle stopped it would be close to top dead center but it was hard to get things sitting just right to do any adjusting but that is a good way to find compression stroke and if you do it on number one cylinder then you could use your timing marks to get it right on the dot. That is kind of going along way around the bush to get to the same place. That is a more handier trick to use when setting lost timing. Your Engine has four cylinders that all have a compression, power, exhaust, and intake stroke. The simplest way is to go ahead and warm engine up like instructions say and then take valve cover off and with key off using your hand crank, slowly crank engine over while watching valve's. You might have to stretch the old neck a little to be able to see. Then whatever cylinder you are working on, you watch the exhaust valve open and close, then watch intake valve open and close and then turn crank a little more to insure the intake valve is completely closed. Note that these two valves will stay closed for 1 complete turn of the crank. I would give the crank 1/2 of a turn and then set the clearance on those two valves. Then just repeat process for the other 3 cylinders. I haven't ever looked at the manual for an M but there might be a difference in clearence for the intake and exhaust. If there is be sure you are setting the valve to the right clearance.

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