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Oliver 77 and S77 crankshaft

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RCP

01-10-2001 04:49:33




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In an earlier post the comment was made that the S77 has larger rod journals than a 77. I was curious about this so I looked it up in and old Oliver shop manual that I have. According to that manual the crankshafts are the same. Comments?




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MCL in IN

01-13-2001 12:45:59




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 Re: Oliver 77 and S77 crankshaft in reply to RCP, 01-10-2001 04:49:33  
How about this. Our 1956 OC-6 crawler is the same vintage as a Super 77 but uses the smaller rod bearings as a Fleetline 77. I know-had to replace one. My understanding is that the OC-6 never got the "Super" engine. I never really heard why. Anyone.....



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Bill

01-11-2001 15:01:58




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 Re: Oliver 77 and S77 crankshaft in reply to RCP, 01-10-2001 04:49:33  
I have a shop manual from 1956. The main bearing sizes were the same but the rod journals are different. The parts manual show a breakdown between cranks and rods based on serial numbers. The supers and three digit series had a rod that is offset vs. centered like on the double digit models. If you put it in the wrong way, you will find that the rod will be very close to one side or rub on the piston in the area of the wrist pin.
The crank si also offset to one side so you cannot interchange the cranks either unless you put the correct rod in with it.

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larry

01-11-2001 13:52:43




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 Re: Oliver 77 and S77 crankshaft in reply to RCP, 01-10-2001 04:49:33  
The old cranks where not hardened, so when the new cranks came out that where, they made them a differant size so the harder bearings could not be used on the wrong shafts. All later replacements were with hard shafts and new hard bearings.So in a manuel only one shaft maybe listed. Allso all rods are listed the same size, the differance is made by changeing the thicknes of the bearing.



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