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Antique Engine Archives All archived posts from 1999 to 2004 when SmokStak was on EnginAds. This is a read-only board.

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75 h.p.Fairbanks Morse

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Old 05-31-2003, 03:59:28 PM
D. Smith
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Default 75 h.p.Fairbanks Morse

Need some advice on rod bearing clearnce onthis engine.It has a 6 in.diameter crank journal and we are not too sure what the max. clearnce should be.Thanks Fellows D. Smith p. s. it is a model Y oil engine.
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Old 05-31-2003, 09:38:01 PM
Tony Page
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Default Re: 75 h.p.Fairbanks Morse

The ideal clearance would be .004 to .006", but as much as .010" would be OK depending on how hard you are going to run it. You can check it with soft lead solder or plastiguage which you can get at the local parts store. Let me know how you cme out. Tony
Old 06-01-2003, 08:05:05 AM
D. Smith
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Default Re: 75 h.p.Fairbanks Morse

Thanks Tony, I thought 5 to 10 might be ok but was'nt sure. Instruction book 2450D says "crank pin bearing is readily adjustable" but no spects. Guess the old timers just knew stuff like that! Thanks again. D. Smith
Old 06-02-2003, 11:37:11 PM
Rod Gaffrey
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Default Re: 75 h.p.Fairbanks Morse

Another way to check clearance is to: Crank the piston to TDC, mount a magnetic base dial indicator to the crankcase with the needle resting on the rod bolt, observe needle reading, with both the inspection cover and the valve chest cover removed, insert a bar completely through the engine and pry up on the rod cap, observe the needle deflection, loosen rod bolts and remove necessary shims to obtain the proper clearance, retighten rod bolts and recheck needle deflection. One should not have to remove the cap to do the above operation. A fellow that has worked on these very large Fairbanks engines gave me this advice. Good Luck.


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