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Oliver 77 Motor

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RCP

01-30-2001 12:03:09




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This motor has M100 and 185220 cast into the block above the starter. Could it be the original motor for a '49 77RC? Is this a problem when it comes to ordering parts? Especially if I decide to bore or stroke the motor?




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terry daniel

01-31-2001 17:10:05




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 Re: Oliver 77 Motor in reply to RCP, 01-30-2001 12:03:09  
L would like to know what other machine has the 1850 diesel perknis in it



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larry

01-30-2001 14:58:23




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 Re: Oliver 77 Motor in reply to RCP, 01-30-2001 12:03:09  
I had trouble finding the infoe useing the casting numbers. I must have misplaced it somewhere. I think you should be ok with what you have.My later 77 has 1M100 as the casting and i think the first ones where 1M000 so M1000 should be ok. If you take the pan off you should be able to see the offset rods.



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RCP to Larry

01-30-2001 15:24:02




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 Re: Re: Oliver 77 Motor in reply to larry, 01-30-2001 14:58:23  
Thanks for the help. If you find anything else please let me know. I have a 77 and S77 parts manual coming but I doubt it will have this kind of detail. The offset rods, are they similar in shape to the rods Waukesha used on the 283 and 310 blocks? Why were they needed?
Rich



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larry

01-30-2001 15:40:02




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 Re: Re: Re: Oliver 77 Motor in reply to RCP to Larry, 01-30-2001 15:24:02  
The explanition in the book is that it had to be done to make all the bearings wider. At the same time the bearing material was made harder.The rod don't realy look like the 283s they are all installed the same way. In these older ones each rod has the offset pointed differant.The key is the closest main bearing and the offset is pointed ? away from it.



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RCP to Larry

01-30-2001 16:15:28




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 Re: Re: Re: Re: Oliver 77 Motor in reply to larry, 01-30-2001 15:40:02  
Larry
Thanks for the explaination, I was thinking the offset was the parting line on the big end of the rod, but now I understand what you mean. It sounds like Waukesha decided they needed more beef in the crank webs, and offsetting the rods allowed them to get it without changing the block bore centerlines. I will drop the pan and have a look at the rods, maybe this weekend if it warms up enough to work in the barn. Anything else I should look for? Are you aware of any 4" stroke cranks for these engines, other than having one custom made, I hate to have one welded and ground not only the cost but I am concerned about the strength.
Thanks Again
Rich

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larry

01-31-2001 05:01:14




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 Re: Re: Re: Re: Re: Oliver 77 Motor in reply to RCP to Larry, 01-30-2001 16:15:28  
I had a tree hit my head sat. and may have messed up the posts i made. A 49 77 would have the non offset rods,the newer S77 have harder cranks and offset rods. The last one i worked on was an old tractor with a new block,it had a mix of parts and got me confused.



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Mike B

01-31-2001 03:26:34




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 Re: Re: Re: Re: Re: Oliver 77 Motor in reply to RCP to Larry, 01-30-2001 16:15:28  
Find a S77 or 770 crank with the larger rod journals and have it offset ground to fit the old 2" rods this will give you a 4.25" stroke for about $200+ pistons



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