New to AC with a WC, rocker shaft / oil pressure
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=207184
Printed Date: 22 Jun 2025 at 2:40am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: New to AC with a WC, rocker shaft / oil pressure
Posted By: Blown331
Subject: New to AC with a WC, rocker shaft / oil pressure
Date Posted: 21 Jun 2025 at 5:38pm
I bought my first ever Allis Chalmers which is a 1936 WC. It appears to have a 1947 electric start engine in it. I got a great deal on it and it's in nice condition and runs great.
When it gets warm the oil pressure gets a little lower than I would like. I'm running a Fram filter with straight 30 weight oil. I tried switching back to the Carquest filter that was on it with no change. The filter standpipe is in place. I added one washer under the oil pressure relief valve cap and did pick up some pressure. I think a switch to 20w50 oil may be what I need. But I also recently learned that the rocker arm shaft is somewhat pressurized and sealed on the ends with cork. I'm guessing I may need those corks replaced. Would this be responsible for the lower oil pressure? I have a parts book and have the part number for the corks but nothing really comes up online. Are people just making these? It seems like driving in a freeze plug would be a better idea. Anyone do this? What size? Any other comments or suggestions are welcome. Thanks.
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Replies:
Posted By: steve(ill)
Date Posted: 21 Jun 2025 at 6:07pm
what is the pressure ? These engines dont need or have a LOT of pressure..
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Like them all, but love the "B"s.
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Posted By: evan austin
Date Posted: 21 Jun 2025 at 6:51pm
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When I had my WD45 engine apart last year, I think I used tapered rubber plugs in the ends of the rocker shaft instead of corks. I think I had to trim some off of the smaller end because they were long, but I oiled them up and they pressed right in. Still use the cotter pin behind them to keep them from blowing out. Not sure what the real manual calls for, but the I&T manual says that normal oil pressure is 11psi. Or, like my operators manual says, somewhere between the "O" and the "M" of "NORMAL" on the gauge
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