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Tractor Talk Discussion Forum

Diesel Engine RPM Measurement

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Andrew H

06-07-2005 20:17:24




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I have a Ford 201 Diesel Engine in my Ford 550 Backhoe. The one belt connects the crankshaft pulley to the water pump pulley to the alternator pulley. Am I correct in assuming that I could measure engine speed with an optical tachometer off either the radiator fan, or the alternator pulley, or the water pump pulley, or even the hydraulic pump shaft? Theoretically, should all measurements be approximately the same RPM?
THanks

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Tim B from MA

06-08-2005 09:21:44




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 Re: Diesel Engine RPM Measurement in reply to Andrew H, 06-07-2005 20:17:24  
Andrew,

See my reply to your earlier post below.



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K.B.-826

06-07-2005 21:26:22




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 Re: Diesel Engine RPM Measurement in reply to Andrew H, 06-07-2005 20:17:24  
No, you"d need to go off of the crankshaft pulley. Diameter effects speed. If a 8" pulley turning 1000 RPM is driving a 4" pulley, the 4" pulley will turn 2000 RPM. If you take the circumference of the crankshaft pulley times it"s RPM"s you"ll come up with the number of feet of belt it moves per minute. Divide that number by the circumference of the alternator pulley, and you"ll come up with it"s RPM"s.

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