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Allis Chalmers Discussion Forum
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Re: low oil pressure

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Author  [Modern View]

04-05-2013 18:48:04

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When first starting do you have any pressure then drops off as engine warms. I just rebuilt a WD-45 that had 4- 6 lbs. cold and nothing when warms up New main and rod bearings and cleaned filter on oil pump. Now 30 weight oil and 12 at idle and 25 full throttle. Book says 12 lbs. or more is normal.
This engine had loose bolt in head near where water hose went to the radiator and allowed water antifreeze to get in pan bearings were sad shape when replaced. ken

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Bobby 9891

04-05-2013 18:58:07

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 Re: low oil pressure in reply to ken48931, 04-05-2013 18:48:04  
It barely comes off the line when cold & pretty much stays there. I dont have numbers on the gauge. Can I get to the oil pump filter by removing the oil pan ??Maybe it's sludged up restricting the flow .

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04-06-2013 05:20:40

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 Re: low oil pressure in reply to Bobby 9891, 04-05-2013 18:58:07  
Pull the pan and check the screen. Also check the screen pipe, for tightness. Oil pump is right in front of flywheel, cam side, IIRR. Before you split the tractor, for an oil pump, make sure your filter is right, chopped up cotton is the media, not paper. one filter mfg had lots of problems, can't remember which.

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Bob Bancroft

04-06-2013 08:38:50

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 Re: low oil pressure in reply to Diydave, 04-06-2013 05:20:40  
The pleated paper, full flow type oil filter, with a rubber baffle put in it, pretending to be a filter for these old engines, was the culprit. It offered no resistance. I know Wix/NAPA had one. I don't know if anyone else did. Some engineer really messed up on that one.

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