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Allis Chalmers Discussion Forum
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WD45 Engine Misses

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Nate in IL

12-15-2003 16:53:29




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Folks-

My WD45 will miss a little when idling. It has new point, condenser, plugs, timed, etc. It doesn't run bad, but after it warms up it just wants to miss some. Not like it's going to die but it drops out enough to worry me.

What do you think?

Nate




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Ron

12-16-2003 07:16:51




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 Re: WD45 Engine Misses in reply to Nate in IL, 12-15-2003 16:53:29  
Could be a wire, a bad plug, point setting, or even the ignition switch... I know that just ONE DROP of water in the sediment bowl will make mine miss if I am working it Hard...!! Setting the valves is hard, if the rocker arms are worn any... If they are, take them off, and file them to a re-conditioned condition, or you will get a false measurement.. I like to use High-temp Silicone ( Red) gasket Maker on those manifold gaskets when I replace them.. I think it kind of "Binds" the asbestos and makes it last longer..It also sticks them in place on the manifold, so you can slide it on without them falling off..!! Post back with what you find..!!!

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Dave (MN)

12-15-2003 21:20:28




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 Re: WD45 Engine Misses in reply to Nate in IL, 12-15-2003 16:53:29  
Make sure your valves are not adjusted to tight. Mine acted the same way so I checked everything from ignition to fuel. Finally checked compression and found very low compression on #1 when the engine was hot. What happens is when the head heats up it expands and the rocker arms tighten up a little. If there not loose enough when cold it can be enough to hold the valve open just enough to lose compression. They will clatter some when engine is cold and quiet down some as she warms up. I can't remember for sure but I think I set them at .012 cold but you should look in the book.

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David

12-15-2003 20:20:07




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 Re: WD45 Engine Misses in reply to Nate in IL, 12-15-2003 16:53:29  
I had been trying to figure out why my WD was missing, had checked everything I could think of then decided to check the manifold studs. Tightened them up some more and it smoothed out very nicely. Had the manifold planed when I overhauled it but hadn't tightened them enough so it was leaking a little, worse when the manifold was hot.



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