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Allis Chalmers Discussion Forum

WD-45 valve clearence

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02-16-2004 04:53:55

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Well since I am checking the head bolt torque I might as well set the valves I know dad didn't do it whan he had the head fixed.
what is the valve clearence cold? and hot if you have them for a WD-45 thanks a ton guys

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02-16-2004 18:34:05

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 Re: WD-45 valve clearence in reply to chad, 02-16-2004 04:53:55  
Pull no. 1 plug, put a finger over the hole, have someone crank engine with hand crank, when you notice compression getting by your finger it is on the comprssion stroke. You can set these two valves now, next crank it over 1/2 turn and set the next in the firing order, etc.

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Duey (IA)

02-16-2004 14:11:56

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 Re: WD-45 valve clearence in reply to chad, 02-16-2004 04:53:55  

OK, the valve lash adjustment. Remember #1 & #4 piston go up & down together only on different strokes. Same for #2 & #3. With the valve cover off, turn it over with a hand crank until you observe the #4 rockers. The exhaust (last one)coming up and the intake starting down (top of the exhaust stroke). At this point, observe the position of your hand crank and check to see if the TDC mark is in the timing hole. When you do all of this on #4 and everything is in place, both rockers for #1 can be set as #1 is on the top of the compression stroke (TDC). Then follow the firing order 1243. When #1 is set, back up the hand crank to catch the notch and then turn the hand crank 1/2 turn stopping in the same place and the rockers on #2 are ready for adjustment. Then 1/2 turn for #4 etc.

This may sound complicated but it only takes 2 revolutions of the crank to complete the adjustments. Also by always backing up the crank a half turn to catch the notch and then stopping the crank in the same position each time, you are close enough to TDC to make the adjustments.

Years ago our block man told me to set valve lash at .020 for heavy duty use. Both intake and exhaust.

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02-16-2004 06:56:48

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 Re: WD-45 valve clearence in reply to chad, 02-16-2004 04:53:55  
If the rockerarms werent resurfaced, you should take a good look at them to see if there is any wear.. You won't get an accurate measurement if there is any.. If there is, you can remove them, and grind or file them to a uniform curvature, so you will get an accurate mearurement when setting the valves.. The rocker arms don't contact the valvestem on the entire width of the rocker surface...wear makes it really hard to get them set accuratly.

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02-16-2004 06:25:53

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 Re: WD-45 valve clearence in reply to chad, 02-16-2004 04:53:55  
The HOT clearance is .012 for the gas engine.

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02-16-2004 08:00:30

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 Re: Re: WD-45 valve clearence in reply to Unimog, 02-16-2004 06:25:53  
thanks for the info.
any procedure how to find top dead center?

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