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06-09-2009 | 05:29 PM

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reklaus

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From: Billings, MT

RE: 110s Tappet adjustment

From Troy Newman on http://www.patternflyer.com/troy/?p=92 :

...Theyshould be set about 0.002”-0.004”. I find the factory doesn’t alwaysget these set the best. I run mine as tight as they will go and stillhave the valve closed. You can wiggle it and feel some gap but it istoo small to measure. If you can tell what you are doing you don’t needa feeler gauge to check it. If you are a sledge hammer mechanic thatcan break and anvil with a rubber hammer, PLEASE use a feeler gauge.Its very important the valve closes. If it doesn’t the piston could hitit and cause major damage to the engine. Really the only thing you willnotice with the tappet clearances too loose is that top end power willbe slightly reduced. Not major but a little. The clearances don’treally affect idle, transition much just the top end power. This justmeans the valve is not staying open as long. So it’s not getting as bigof charge before the valve closes and it makes the Boom. ...

I use a similar method. First the engine must be at top dead center, piston at the top of its stroke and both valves closed. I loosen the lock nut and back the adjustment screw off about one (1) turn. I then place my index finger on one end of the rocker arm and my middle finger on the other end and "rock" the arm while I slowly tighten the screw. When the play just disappears, I open the adjustment 1/4th turn from where the clearance JUST disappeared. Tighten the lock nut and your done.

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