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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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770 engine question

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counterclockwise

03-13-2008 16:31:30




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I recently bought a 770 gas engine. Before installing it I thought I'd fix a few leaks and adjust the valves. The adjusters on the rocker arms were screwed way into the rockers and there was only about 1 thread of the adjuster screw in the jam nut and the lash was still very loose! Seems like the push rods are too short or some other problem? Since don't know any history of this engine is there a possible mis-matching of parts? Are super or non-super (77) push rods a different length? Head has casting numbers 185502B and 100334A. Block numbers are 185220E and IMB100B. OAL of push rods 10 7/8 inches. Any other ideas? Thanks in advance for your input

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counterclockwise

03-13-2008 17:16:11




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 Re: 770 engine question in reply to counterclockwise, 03-13-2008 16:31:30  
The rocker arm supports are cast iron. That could be the problem. Looks like I need to find out the height of the aluminum ones. I've got a couple old 77 heads out in the back barn and there does not appear to be a substantal difference in stem height between them and the 770 engine. I just bought the engine, did not get the entire tractor.
Thanks for the reply.



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J Schwiebert

03-14-2008 00:35:07




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 Re: 770 engine question in reply to counterclockwise, 03-13-2008 17:16:11  
I had a similar problem one time with a regular 77 that I had put seats and Super valves in (less money-had super sleeves as well)I just set the 77 rocker arm shaft up on the surface grinder and ground I hhink 0.125 off. Oil control and valve sticking problems were common on early Super 77 diesels and to solve that issue a rocker arm shim to make the short supports longer was also furnished.J.



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J Schwiebert

03-13-2008 17:00:44




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 Re: 770 engine question in reply to counterclockwise, 03-13-2008 16:31:30  
Well let me start with what little I know. Super & non Super push rods are of different lengths. Rocker arm supports for a Super or 770 will be aluminum. Rocker arms supports for a 77 will be cast. Now do you think that this engine has had new seats installed for both exhaust & intake valves and the stem height is not the correct dimension? I don't remember push rod lengths in my head. Did you just buy the engine or did the rest of the tractor come along? Anyway later 770 blocks have a different casting number. If you have other questions I will try to help, but it will probably Sunday or way way early on Saturday. Do you have another Oliver engine you can compare installed stem height to?

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