Posted by Leonard on April 11, 1998 at 16:05:52:
In Reply to: Re: Re: Re: Re: Re: 9n exhause manafold red hot posted by doug on April 10, 1998 at 18:53:10:
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: : : : : : When I run my 9n, the exhause manafold gets glowing red. Is this normal? If not how can I correct it? Any help is appreciated.
: : : It is typical for the exhaust manifold on a heavy duty engine to become hot enough to change color. This is especially true when the engine has been under a continuous heavy load, such as when plowing or discing. The color change is very noticeable after dark - I can remember my father returning from the fields on a JD520, and the glow from the manifold was visible from several hundred yards.
: : I agree. Under heavy load they will get quite red. I've spent a lot of time on a Farmall M and a Super M plowing after dark when the manifold, exhaust pipe, and muffler were all glowing red. The M was especially prone to this. With the tractor lights off and plowing by moonlight, you could actually see the baffle outlines inside the muffler! The fact that it was turning considerably more than stock rpm's probably contributed to this.
: Play it safe. Take the "check the timing" advise. This is especially important if the manifold is red under only a moderate load. My father's IH 400 had a badly worn distributor gear which caused it to "jump time" resulting in a cherry red manifold and muffler in January while feeding hay to the cows. Under extreme loads nearly all manifolds will turn red, this is normal.
I vividly remember the dust motes and bits of dry corn leaves burst into little flares as they landed on the cherry-red manifold of Dad's 1939 Model A John Deere while picking corn late in the evening with the two row mounted picker. Right under the gas tank too! Leonard