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Oil Pump 1948 C
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bigbirdww View Drop Down
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Joined: 20 Aug 2021
Location: Ipswich MA
Points: 23 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bigbirdww Quote  Post ReplyReply Direct Link To This Post Topic: Oil Pump 1948 C
    Posted: 11 Feb 2022 at 8:09pm
My oil pressure is just barely showing on gauge at idle. Full throttle pressure gauge just barely comes into the normal. Checked with two new gauges. I want to rebuild the oil pump. Is that possible or do I need to find a working oil pump? 
1948 AC-C
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KMAG View Drop Down
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Joined: 26 May 2020
Location: Elizabethtown,
Points: 680 		Post Options Post Options   Thanks (0) Thanks(0)   Quote KMAG Quote  Post ReplyReply Direct Link To This Post Posted: 11 Feb 2022 at 9:27pm
First, is the stem in place on the oil filter housing? The oil filter sits on it. When the stem breaks/missing, oil pressure is lost.



Edited by KMAG - 11 Feb 2022 at 9:27pm
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 88334 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 11 Feb 2022 at 11:03pm
As Andy said, the first thing to do is see if the filter is damaged, or the 1/4 inch tube with the 1/8 inch hole up the middle of the filter is gone, or broke.. That would allow excessive oil to be dumped back to sump..

Another possibility is a plugged suction screen in the oil pan.

Assuming both above are OK, then the wear is probably in the pump.. YES, you can remove it ( split tractor) and rebuild.. You might need new VANES or springs.. Side plates can be filed or machined FLAT of any wear. Replace face gasket so you have .001-.003 clearance on the VANES to side wall.




Edited by steve(ill) - 11 Feb 2022 at 11:08pm
Like them all, but love the "B"s.
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Steve in NJ View Drop Down
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Joined: 12 Sep 2009
Location: Andover, NJ
Points: 12012 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve in NJ Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 2022 at 7:49am
Yeah, like the guys mentioned, if the tube in the filter is solid and in good shape, it could be #15 in Steve's explosion. Those oil screens sure get mucky and slow up oil going into the pump. When I first restored my B, I couldn't believe the muck that was in that screen. It's a good thing I didn't try to start the engine when I first got the Tractor. It probably would've been a catastrophe when I tried to start it!
Steve@B&B
39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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bigbirdww View Drop Down
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Joined: 20 Aug 2021
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Points: 23 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bigbirdww Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 2022 at 7:57am
I removed the oil pan to clean sludge and clean suction screen which had a small amount of crud on it. I primed the oil filter tube prior to installing filter. There was air coming from tube so I believe it is okay. So it looks like I am splitting the tractor. Is there a source for new vanes and springs if needed? Thanks again for you input.
1948 AC-C
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 88334 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 2022 at 8:12am
there are some Allis Dealers still around.... One out East is Sandy Lake Equip... they could get parts for you.




Edited by steve(ill) - 12 Feb 2022 at 8:14am
Like them all, but love the "B"s.
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