Farm Equipment - AC model C blowing out oil

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AC model C blowing out oil

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=184156
Printed Date: 07 Apr 2026 at 7:45am
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Topic: AC model C blowing out oil

Posted By: capn lonnie
Subject: AC model C blowing out oil
Date Posted: 25 Oct 2021 at 6:02pm

So I replaced the cylinder o rings and piston rings, put everything back together, and started her up… runs good but blowing oil out of the hole on the bottom of the bell … any ideas?

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'44 B '46 C '58 D-14 '78 5050

Replies:

Posted By: steve(ill)
Date Posted: 25 Oct 2021 at 6:08pm

bellhousing ??.......... What is inside there is the crank shaft rear seal... and the WICK in the center of the crank shaft that allowed oil it drip outside for lube...

guess it could be the back end of the cam shaft / pump drive area ??

Either way, its behind the clutch.... and need to split tractor.

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Like them all, but love the "B"s.

Posted By: PaulB
Date Posted: 25 Oct 2021 at 6:09pm

Did you replace the wick in the crankshaft? Did you prepare and properly install the rear main seal? Where in Maryland are you?

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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY

Posted By: KMAG
Date Posted: 25 Oct 2021 at 6:12pm

Oil out bottom hole of bellhousing?

Assuming engine and not trans oil... 3 typical possibilities.
#1 crankshaft rear main seal is leaking.
#2 oil pump located on back of engine block is leaking.
#3 Both #2 and #3.

You'll need to split the tractor to do the repair(s) no matter the cause.

Posted By: capn lonnie
Date Posted: 25 Oct 2021 at 6:43pm

I thought it was the rear main seal and I replace the seal…must be the oil pump… I am on the lower Shore…thanks, guys, for the replies!

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'44 B '46 C '58 D-14 '78 5050

Posted By: steve(ill)
Date Posted: 25 Oct 2021 at 8:36pm

Seal or wick would normally be a drip... very slow, or if really bad possibly a constant drip... If you have a stream, its the pump or the pipe screwed into it... pipe sticks out the top of the bell housing... hard to look around it, but see if you have any oil coming out of the pipe threads at the pump.

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Like them all, but love the "B"s.

Posted By: capn lonnie
Date Posted: 25 Oct 2021 at 8:55pm

Yes, it is a stream, I will take her apart again tomorrow. Thanks!

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'44 B '46 C '58 D-14 '78 5050

Posted By: capn lonnie
Date Posted: 26 Oct 2021 at 5:46pm

Took the motor out today and found that the 1/8” nipple had split, like the last one. I guess when I put the motor in the nipple was bumped, even though I thought I was careful. Got a longer nipple, put the motor in and then screwed in the nipple…everything back running well now… thanks, guys, for the help!

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'44 B '46 C '58 D-14 '78 5050

Posted By: KMAG
Date Posted: 26 Oct 2021 at 6:02pm

We appreciate you posting what resolved the issue to confirm our diagnoses and guide other AC owners who experience the same problem.

Posted By: capn lonnie
Date Posted: 27 Oct 2021 at 8:33pm

No problem, I really appreciate the help!

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'44 B '46 C '58 D-14 '78 5050

Posted By: wjohn
Date Posted: 28 Oct 2021 at 9:25pm

Yes, thanks - so many times we never know what the fix is and we're left wondering. Glad you got it all back together and holding fluids.

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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45