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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Supper 88 Diesel Overhaul

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Shaun Murray

05-22-2004 09:58:38




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I recently have been restoring a 1958 Super 88 Diesel with a wide front end and a 3pt hitch. As with any good restoration, I have the tractor I am working on and the one I am robbing parts from. However, this engine definitely needed a little tender loving care. To make sure that it runs like a champ, I have replaced the crank, pistons and sleeves, camshaft checked out ok, but new rings and a newly rebuilt head were required to top everything off. Of Course new rod bearings, main bearings and wrist pin bushings were put in. However, now when I try to turn the engine it turns hard by hand. In fact, it is all I can do to turn it with a 16 inch breaker bar. Should it turn this hard and will the start turn it over fine when I put it back on the frame?

Any input and suggestions is accepted. I used a engine lubricant when I put everything back together to stop friction. Thanks

Shaun

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RAB

05-23-2004 05:10:52




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 Re: Supper 88 Diesel Overhaul in reply to Shaun Murray, 05-22-2004 09:58:38  
No diesel will/should turn easily when built up. The compression ratio is considerable.
The engine should turn according to specs without injectors fitted.
You should check tightness on every bearing as it is fitted. One tight or loose bearing can destroy all your otherwise good attempts in a very short time.
Regards, RAB



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Rich

05-23-2004 05:00:49




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 Re: Supper 88 Diesel Overhaul in reply to Shaun Murray, 05-22-2004 09:58:38  
I had the same question two years ago when I rebuilt the engine in our 77 gas. As I added piston and rods to the engine it got progressivly harder to turn over. I went back over the rods and couldn't find anything, I am convinced that it was the piston rings riding in the bore, after runinng the engine for a few hours everyhting is just fine, it can be turned with a short ratchet (when the sparkplugs are out).

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Gary

05-22-2004 17:53:22




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 Re: Supper 88 Diesel Overhaul in reply to Shaun Murray, 05-22-2004 09:58:38  
Where did you get the brgs.? It used to be that the brgs from some of the places like trsctor supply and central tractor were slightly undersized and would be to tight. When you tughten the rods I always check to be sure they will move on the journal. If youtake the wrench you should see them move without much effort.



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Kruse

05-22-2004 14:33:21




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 Re: Supper 88 Diesel Overhaul in reply to Shaun Murray, 05-22-2004 09:58:38  
What clearances do you have on your mains and
your connecting rod bearings? I assume you
at least used Plasti-gage to check your clearances
when you put it together..... .

Another poster made a good point about the high compression when the head is on. After you tightened each main cap, and after you tightened each rod bearing, did you make sure that the assemly turned freely BEFORE you put the head on and torqued it down?

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Shaun Murray

05-24-2004 14:43:42




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 Re: Re: Supper 88 Diesel Overhaul in reply to Kruse, 05-22-2004 14:33:21  
The head is not on yet. Should I be really concerned then. My engine stand is not the sturdiest either. Could I be loosing leverage on my wrench because my engine stand is giving a little?



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Kruse

05-24-2004 17:16:57




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 Re: Re: Re: Supper 88 Diesel Overhaul in reply to Shaun Murray, 05-24-2004 14:43:42  
One other thing. I know this sounds silly and nobody would EVER do this.... ;-) but, are you positive that you did not install a main cap or a connecting rod cap 180 degrees off?
That would put side pressure on the bearing and it's mating surface and cause it to turn hard.
This could easily cause an engine failure!



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Kruse

05-24-2004 16:39:39




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 Re: Re: Re: Supper 88 Diesel Overhaul in reply to Shaun Murray, 05-24-2004 14:43:42  
Well, there has been some pretty good advice given
to you by the other posters, but here's what I would do.
First, take away some of your worry by at least
putting some wooden pallets or something similar
under that engine block if it is unstable and you feel that it might fall. Seems like nobody has time for safety, but they all take time to recover from a serious accident.
Now, how tight is your assembly? Can you turn it at all, or is it so tight it will not move? If it turns, but turns hard, get some Plasti-gage from your local auto parts store and check each con rod bearing and each main bearing. I get the feeling that this hasn't been done, but maybe I'm wrong.
If your assembly does not turn at all, you should loosen each rod assembly and push it out and start from the beginning by tightening the mains, checking the clearance and then do one rod bearing at a time, checking each clearance and giving the assembly a turn or two to make sure that it will freely turn. BTW, make sure you take the Plasti-gage out before you give the assembly a turn! (You'll smear the Plasti-gage around the
bearing assembly othewise)
I'm sure some other people have different approaches other than mine so please listen to them also. Good luck. A little precaution now can save you mega bucks later.

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Danny Tabor

05-22-2004 14:04:10




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 Re: Supper 88 Diesel Overhaul in reply to Shaun Murray, 05-22-2004 09:58:38  
I had rebuilt a 77 with the same deal. Almost to much compression to turn it over. The starter wouldn't do it! I ended up pulling it around for the first couple startings. I don't know why it was so tight but it was 2 yrs ago that we rebuilt it> It starts and runs fine now! Maybe everything needed to seat. Before putting it in the frame. Be certain to check all torque settings.

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