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Farmall & IHC Tractors Discussion Forum
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measuring engine RPM ???

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Kevin Brooks

09-06-2005 14:31:52




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Ever since I removed and cleaned my M"s governor I have noticed that the engine rpm seems much higher than it should. I don"t have any tach to measure rpm, just sound. Can a tach be used the same as on a modern car and do I need a timing light, too? Assuming it"s off, how would I adjust the timing?
Also, I removed the hydraulics pump for overhaul. Would the removal also influence engine load, hence rpm?

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Phlogiston

09-06-2005 20:26:52




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 Re: measuring engine RPM ??? in reply to Kevin Brooks, 09-06-2005 14:31:52  
Why can't you measure off the PTO and do a little math for the RPM's?

Phlogiston



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Kevin Brooks

09-08-2005 08:22:51




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 Re: measuring engine RPM ??? in reply to Phlogiston, 09-06-2005 20:26:52  
Assuming that I had a functioning PTO, which I don't, how would I measure off the PTO. I'm told my PTO speed would be ~540rpm.



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El Toro

09-07-2005 04:00:30




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 Re: measuring engine RPM ??? in reply to Phlogiston, 09-06-2005 20:26:52  
It would easier to use what Jim has suggested with the tach/dwell meter or the strobe light. Hal



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Janicholson

09-06-2005 16:21:45




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 Re: measuring engine RPM ??? in reply to Kevin Brooks, 09-06-2005 14:31:52  
The pump is not related, it idles when not in use. The simple tach dwell meter can do you fine for RPM. It attaches to the dist. side of the coil and measures RPM directly.
Another way (more complex) is to use a strobe tach. One adjusts the strobe till the front pulley is stop motioned in the strobe, and the RPM is read off the LCD, or analog meter.
Another way is to buy a four cylinder Tach from the auto store, and hook it up as directed. (if 6v, be sure it is compatible)
A timing light is not needed (unless you want to be extra nervous about the centrifugal advance system etc. The static timing has worked fine for Letter series and beyond.
Good luck JimN

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Dick Davis

09-06-2005 18:57:35




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 Re: measuring engine RPM ??? in reply to Janicholson, 09-06-2005 16:21:45  
What is the range from idle to max no load RPM that one should expect on an M? Thanks Dick Davis



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El Toro

09-07-2005 03:56:08




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 Re: measuring engine RPM ??? in reply to Dick Davis, 09-06-2005 18:57:35  
The low idle speed is around 425 rpm's and the no load rpm is 1595. Hal



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