Oil Pump 1948 C
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=186387
Printed Date: 20 Oct 2025 at 6:01pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Oil Pump 1948 C
Posted By: bigbirdww
Subject: Oil Pump 1948 C
Date Posted: 11 Feb 2022 at 8:09pm
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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 |
Replies:
Posted By: KMAG
Date Posted: 11 Feb 2022 at 9:27pm
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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. |
Posted By: steve(ill)
Date Posted: 11 Feb 2022 at 11:03pm
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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.  ------------- Like them all, but love the "B"s. |
Posted By: Steve in NJ
Date Posted: 12 Feb 2022 at 7:49am
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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 |
Posted By: bigbirdww
Date Posted: 12 Feb 2022 at 7:57am
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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 |
Posted By: steve(ill)
Date Posted: 12 Feb 2022 at 8:12am
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there are some Allis Dealers still around.... One out East is Sandy Lake Equip... they could get parts for you.
https://www.sandylakeimp.com/oempartfinder" rel="nofollow - https://www.sandylakeimp.com/oempartfinder ------------- Like them all, but love the "B"s. |