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Oil pressure

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David (Scotland

05-13-2003 02:28:40




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When first started from cold oil pressure on my 4 cylinder FE35 is right at top of gauge. In fact I have the relief valve adjusted to keep it just below red. After the engine gets hot it drops to alomost nothing (just at red at low end) even with engine revving at PTO speed and higher. I have 20-50W diesel oil in it. I'm assuming I need to repace the main and big end bearings to fix this as its probably worn, but what I wonder is whether it is normal to have such a large difference in cold and hot pressure with worn bearings? I'd have thought the cold pressure might be a bit low too if bearings/crank was badly worn. It has no symptoms of bore/piston wear but I suppose they could have been replaced without anything been done to the bottom end.

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fergi

05-27-2003 19:28:11




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 Re: Oil pressure in reply to David (Scotland), 05-13-2003 02:28:40  
My 165 diesel had the same symptons 60psi at cold start up and about 10psi at warm pto speel and nearly nothing at warm idle. I tried a new oil pump and that was $100+ gone, no help. I finally did a major tear down. The crank was banged up beyond help so I got a complete kit liners to crank. It now keeps 60 cold start up 60 warm pto speed and 40 warm idle. I'm happy good luck.



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James In MO

05-14-2003 17:53:19




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 Re: Oil pressure in reply to David (Scotland), 05-13-2003 02:28:40  
First things first check your oil pressure against a good guage you can by kits at your local parts store that will adapt into your sending unit hole and run up to a mechanicasl guage see how close thay are. Next if you have a Continental G176 you cannot get a new oil pump for it you can only get re build kits which are 40 dollars but if your bearings are worn you are putting a small amount of metal into your oil and that isn't good eiter I can tell you on a G176 the pump should releive at 40psi

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Guy R

05-13-2003 07:55:03




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 Re: Oil pressure in reply to David (Scotland), 05-13-2003 02:28:40  
You are on the right track with your suspicions. Worn bearings usually do not account for such a big discrepancy in pressure. Check your oil pump first. The pump gears and/or housing has excessive clearance from too much wear. This fix is MUCH cheaper and easier than doing bearings. Usually you can just bolt on a new pump, although M-F dealers migth carry a 'shim kit' for it. I used one on my TEA 20. It had the identical problem you described

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