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Discussion Forum

Allis WD oil pressure trouble

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03-09-2000 18:28:08

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After working my WD for a hour or so I notice that the oil pressure gauge gradually drops off to near no pressure. Switched gauges, same problem. Start it back up the next day, pressure is great again and then gradually drops off to nothing. What do you all think is going on? I hope its the oil pump. Anyone had this problem?

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03-12-2000 19:38:51

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 Re: Allis WD oil pressure trouble in reply to Chris, 03-09-2000 18:28:08  
chris don't get to concerned about the drop in oil pressure , here are a few things you can do that won't cost you anything put on a good oil filter like a agco brand if that isn't the trick take plug out on the side of the engine and set up the spring to get more pump pressure good luck

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Rob in MO

03-10-2000 03:39:46

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 Re: Allis WD oil pressure trouble in reply to Chris, 03-09-2000 18:28:08  
If you're using a multi-viscosity oil, you can try using straight 30w, or even 20w 50 if you're not in a cold climate. It'll hold it's viscosity longer and still provide lubrication everywhere you need it. As long as it's getting SOME oil and not knocking, rattling or smoking bad, I'd put off the overhaul as long as possible. The rebuild kits are $500 or more!!!! But then again, I'm sort of a lazy cheapskate....

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03-10-2000 12:24:58

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 Re: Re: Allis WD oil pressure trouble in reply to Rob in MO, 03-10-2000 03:39:46  
I just bought the tractor a month ago and it had not run for 2 years. I needed it for the scrape blade and have not changed the oil or anything. It does not smoke, knock or anything, and runs real strong even with the oil pressure down. I have no idea what oil grade he had been using in the WD. I like to use a 30w non-detergent in my Farmalls. What would you recommend to use when I change it?

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Rob in Mo

03-10-2000 16:31:57

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 Re: Re: Re: Allis WD oil pressure trouble in reply to Chris, 03-10-2000 12:24:58  
I'd drain the pan completely, add6 quarts of good SAE 30 and put on a NAPA 1101 filter (if it's so equipped)Be sure you don't throw away the little metal tube that goes up into the filter... It's $30.00 for a new one from Agco. If you're not certain of the accuracy of the guage, go get a new one for $20.00 from Agco. They're only supposed to put out 12-14 psi anyway, so as long as oil is being circulated, don't sweat it. Sounds like it runs good. If the pressure still drops after it gets hot, try a heavier oil. Have fun, RC

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Dave Kolby

03-10-2000 16:53:47

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 Re: Re: Re: Re: Allis WD oil pressure trouble in reply to Rob in Mo, 03-10-2000 16:31:57  
Having farmed with WD's since 1948 I can tell you this is pretty normal. This is a bypass filter system. The gage is reading the pressure thru the filter not the actual pressure in the engine. It will be almost nothing at idle when hot. This has been extensivly discussed in the past on the Stratton board. The original WD oil filters were a "rag" type filter, The system is set up for this type filter which provides more resistance than modern filters and thus shows more pressure. Asa long as you read pressure cold the oil pump is okay. I use 30W non-detergent oil in my WD's all year round. Just don't worry about it, it is normal.


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03-09-2000 21:21:09

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 Re: Allis WD oil pressure trouble in reply to Chris, 03-09-2000 18:28:08  
Sounds like you are looseing oil pressure do to bearing wear,Cam rods& mains,in other words time for a over haul.When the motor and oil heats up the oil will start to thin down,and as this happens the wear in the old bearings and the extra clearance cause the pressure to drop.Sorry

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