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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Drilling Oil Holes in 88 Crankshaft

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Ken COWBOY Wini

04-07-2008 17:40:26




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A friend of mine who worked at a automotive machine shop said that the old engines can have their crankshafts drilled between the main bearing journals and the rod journals to supply oil to the rods verses the original splash lubrication system.

Sounds like a plan especially for high speed applications but has anyone done this? I'm sure it may weaken the crankshaft slightly, and may drop oil pressure a little if the pump can't keep up the amount of supply needed.

Has anyone had this done or heard of doing it? Just a question that has been on my mind lately.

COWBOY in Maine

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BM

04-09-2008 04:53:50




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 Re: Drilling Oil Holes in 88 Crankshaft in reply to Ken COWBOY Winiarski, 04-07-2008 17:40:26  
I did it on a 88 crank that was stroked to 5.5. Used a end mill to spot face the journal so i had a flat spot to start drilling on. used a very long 118 degree split point cobalt 3/16 bit. Bought 6 of them, drilled one hole then threw the bit away and used a new one for the next hole. it had a 2" rod journal and is holding up in a 505 inch engine turning 3500 rpm.



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880 oliver

04-08-2008 04:47:43




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 Re: Drilling Oil Holes in 88 Crankshaft in reply to Ken COWBOY Winiarski, 04-07-2008 17:40:26  
Your better off to use a 302(99 six cylinder) crank which is already drilled. You can modify (clearance) a 310 engine oil pump which doubles your oil pressure.



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Going to Blow

04-07-2008 18:04:53




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 Re: Drilling Oil Holes in 88 Crankshaft in reply to Ken COWBOY Winiarski, 04-07-2008 17:40:26  
I had it done by a local crankshaft specialty house on a 1600 gas crankshaft. They needed to use something other than a high speed steel drill bit to get through the hard outer surface of the crankshaft.



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Ken COWBOY Winiarski

04-08-2008 03:22:40




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 Re: Drilling Oil Holes in 88 Crankshaft in reply to Going to Blow, 04-07-2008 18:04:53  
I know they use a diamond bit drill to drill in extremely hard stuff. Did your crank hold up good? Any noticable difference in oil pressure? Expensive to have it done?



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Going to Blow

04-09-2008 02:02:21




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 Re: Drilling Oil Holes in 88 Crankshaft in reply to Ken COWBOY Winiarski, 04-08-2008 03:22:40  
It held up fine. I used a higher pressure relief spring for the oil system and a gear type oil pump from a seven main block for more available oil volume. I don"t remember it being that expensive but I had it done back in the early 90"s.



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J Schwiebert

04-08-2008 03:50:20




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 Re: Drilling Oil Holes in 88 Crankshaft in reply to Ken COWBOY Winiarski, 04-08-2008 03:22:40  
I am going to throw 2 things at you: How many RPM are you looking for? Remember the 1550/55 as well as the 1650/55 gas engines are rated at 2200 RPM and they use that same pump and lube system as the 88. Waukesha also had some drilled cranks for some of the same basic Waukesha models as Oliver used with drilled cranks. One of the changes in those engines is a totally different oil pump!



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