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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Super 88 rod bearing lubrication

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Ross B

09-10-2005 20:27:25




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How do the rod bearings in my super 88 gas engine get lubricated? I did not see any oil holes in the crank journals, and no oil hole through the center of the rod for the wrist pin, just 2 holes on each side of the top of the rod? could someone please explain this to me?




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WFE

09-10-2005 21:06:04




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 Re: Super 88 rod bearing lubrication in reply to Ross B, 09-10-2005 20:27:25  
There is an oil gallery that stretches the length of the motor on the camshaft side. Small holes in this oil gallery shoot constant pressurized streams of oil at the connecting rod journal end as it rotates. At the journal end of each connecting rod is a small collection cavity or hole, which captures/receives this oil stream. The rod bearing has a hole that aligns with this hole in the rod journal-end top which allows the oil to lubricate the journal. It is important to remember that this isn't a purely pressurized lube circuit, nor is it entirely splash lube. It is what you might call pressure-directed splash. But in these engines, because the journal is getting intermittent lubrication (when the rod hole aligns with the oil stream from the oil gallery to each rod) instead of a constant supply of pressurized oil via a drilled journal, running these engines for extended periods significantly above their original high idle specs of 1750 rpm could cause accelerated rod bearing wear. As for the wrist pins, they are splash lubed. There is a hole in the top of the rod at the pin-end to receive oil dripping from the underside of piston.

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Ross B

09-10-2005 23:01:51




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 Re: Super 88 rod bearing lubrication in reply to WFE, 09-10-2005 21:06:04  
thanks, I had noticed those holes just didnt know what they did. my rods have a hole in each side of the rod, but some of my bearings only have one hole, some of the others have 2 holes, does that mean I have some of the wrong bearings?



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J. Schwiebert

09-11-2005 03:23:35




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 Re: Super 88 rod bearing lubrication in reply to Ross B, 09-10-2005 23:01:51  
As usual WFE has done an excellant job of explaining things.When reassembling, Do double check as the rods are offset and 3 go in each way. Are you talking one hole for each half? I have seen engines where the other hole was plugged from dirt. Look on the back of the bearings and get the manufacture and the manufactures number and get back with us. Most have other holes as they also fit later engines which do have drilled cranks.

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