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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum

Oliver 88 Diesel Crankshaft Replacement

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Ken COWBOY Wini

01-31-2008 14:07:35

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I have a Super 88 Diesel with an older 88 engine (231 CID) that someone installed and I found that the crank and 3 rods will need replacement. It has a 3-1/2 inch bore and the older #190111 crankshaft (Small Rod Journal).

What I need to know is if a later crankshaft from a Super 88 or a 880 will fit into this block with new rods to match the new crankshaft?

I already have larger pistons and will bore the sleeves to fit. Any ideas? Reason for changine crankshaft is it is scored over .050 inch and 3 spun bearings. It will have higher compression and higher RPM if we pull it at the fairs once in a while.

Any Ideas?

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chore boy

02-01-2008 06:25:17

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Re: Oliver 88 Diesel Crankshaft Replacement in reply to Ken COWBOY Winiarski, 01-31-2008 14:07:35

if you are going to try to build some more hores power you mite want to find a late super or an 880 block because they ar stronger

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J Schwiebert

02-01-2008 06:55:56

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Re: Oliver 88 Diesel Crankshaft Replacement in reply to chore boy, 02-01-2008 06:25:17

I agree, get the later block a short block assembly would be good. I wonder how much horse power he is thinking? An original Super 88 head might be good as well. J.

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Ken COWBOY Winiarski

02-01-2008 08:44:12

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Re: Oliver 88 Diesel Crankshaft Replacement in reply to J Schwiebert, 02-01-2008 06:55:56

I wasn't planning on going much more than stock. Maybe set the governor up to 2000 or 2200 RPM rather than the 1750 RPM factory.

Just boring to 3-3/4 inch and leave it at that. Mostly light work around the farm and showing it and pulling it at fairs (Stock Classes).

But since I have to buy a crankshaft and 3 rods anyway, and they sell for the same price as the older crank, is it better to update the crank?

COWBOY in Maine

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J Schwiebert

01-31-2008 18:27:31

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Re: Oliver 88 Diesel Crankshaft Replacement in reply to Ken COWBOY Winiarski, 01-31-2008 14:07:35

The crank & rods will fit. The rods are offset, make sure you put them in correctly. You are kidding yourself on boring those sleeves. Years ago most of them I tookout would be too thin for that.

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Ken COWBOY Winiarski

02-01-2008 05:01:07

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Re: Oliver 88 Diesel Crankshaft Replacement in reply to J Schwiebert, 01-31-2008 18:27:31

Is the newer (Larger Rod Journal) crankshafts much stronger than the old (smaller journal) one? And are the offset rods any stronger?

And if these sleeves are not the older ones that are tapered down around the water jacket, then boring them shouldn't be a problem? Correct?

COWBOY

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J Schwiebert

02-01-2008 13:59:23

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Re: Oliver 88 Diesel Crankshaft Replacement in reply to Ken COWBOY Winiarski, 02-01-2008 05:01:07

I answered you on the fixer up thread. Sorry about that. J.

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Ken COWBOY Winiarski

02-01-2008 16:11:10

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Re: Oliver 88 Diesel Crankshaft Replacement in reply to J Schwiebert, 02-01-2008 13:59:23

"J",... I did the same. Posted in the other "Fixer Up" thread. Please read up there.

COWBOY

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Tramway Guy

01-31-2008 16:00:18

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Re: Oliver 88 Diesel Crankshaft Replacement in reply to Ken COWBOY Winiarski, 01-31-2008 14:07:35

I think the cranks are the same except for rod journal diameter. If there is any problem, it might be minor interference clearing block casting internally, which could be taken care of with a grinder, probably.
As far as boring the sleeves, I can't imagine that it would be cheaper than new S88 sleeves. That's what I put in my 88 years ago.

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