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Re: A cylinder 2 and 3 not firing

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ih560

05-11-2008 20:18:16




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If the valves are not closing that either means you have poorly adjusted tappet gaps, burnt valves or carbon build up on them. None these are really the result of a manifold gasket.
And the weak point of the gasket is not between the exhaust and intake ports, that is actually their strong point. The bolts are in between these ports and most of the clamping force is here. It would be more likely that the gasket would leak from the top and bottom. Meaning that they would suck air on the intake and then it make the engine idle high, and he would have noticed this when he sprayed carb cleaner around the manifold.

And there is really now way if it could happen , but if exhaust gasses where somehow making there way over and into the intake port it would cause the engine to run rich and the plugs may appear a little wet when he took them out. But then engine runs just fine when you put a little exhaust gas back into the intake , as in the whole principle of EGR. Exhasut gasses are recirculated into the intake to lower combustion chamber temps in an effort to hold off detonation allows further timing advancement, equalling more power and better fuel economy.
If you look at your manifold on your 140 you will see what I am talking about when I say it is almost impossible for the manifold to leak exhaust gasses across the manifold gasket area.

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1fortyfanatic

05-11-2008 22:41:21




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 Re: A cylinder 2 and 3 not firing in reply to 658834, 05-11-2008 20:18:16  
Teddy, I re-state that it is unlikely that a bad gasket could lead to "screwy" compression readings, but even you have admitted, that it is possible. To quote you in one of your earlier posts:

"The only thing running without manifolds will do is eventually burn the valves due to the heat not being carried away from them through the manifold."

Then in this last post, you state...."If the valves are not closing that either means you have poorly adjusted tappet gaps, burnt valves or....."

So, I hope you understand that my point was, as you have already stated, that A can lead to B.



Now with that said, while extremely enjoyable, none of this discussion between you and I is really of any help to francois in his original post. But it has kept me on my toes tonight :D
Dave

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ih560

05-11-2008 23:03:32




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 Re: A cylinder 2 and 3 not firing in reply to 1fortyfanatic, 05-11-2008 22:41:21  

1fortyfanatic said: (quoted from post at 22:41:21 05/11/08) Teddy, I re-state that it is unlikely that a bad gasket could lead to "screwy" compression readings, but even you have admitted, that it is possible. To quote you in one of your earlier posts:

"The only thing running without manifolds will do is eventually burn the valves due to the heat not being carried away from them through the manifold."

Then in this last post, you state...."If the valves are not closing that either means you have poorly adjusted tappet gaps, burnt valves or....."

So, I hope you understand that my point was, as you have already stated, that A can lead to B.



Now with that said, while extremely enjoyable, none of this discussion between you and I is really of any help to francois in his original post. But it has kept me on my toes tonight :D
Dave


The "A" you listed will not lead to the 'B" you are inferring unless the headgasket could have a 1 or 2 inch round hole for a leak. A simple gasket leaking would not be a big enough problem to burn the valves. It would take running without an exhaust manifold for a period of time to burn the valves. You are missing the point here. I do not know how else to say that a leaking manifold gasket would not cause a compression test to give any different results. You could take the manifold completely off and still get the same compression reading.

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