D17 Oil Leak
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=211789
Printed Date: 18 Sep 2026 at 6:58am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: D17 Oil Leak
Posted By: Putnamd17
Subject: D17 Oil Leak
Date Posted: 25 Jul 2026 at 11:19am
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I have a D17 Series 4 the engine was recently Resealed front and rear mains, etc. I hooked it up to a single shank snap coupler ripper/subsoiler recently and ever since I have had a decently sized oil leak coming from the cover underneath the tractor behind the engine (where the engine and clutch/transmission meet) any ideas as to what happened and how to fix? thanks
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Replies:
Posted By: AC720Man
Date Posted: 25 Jul 2026 at 4:14pm
Sounds like a rear main seal failure. If it is in fact that, the engine has to be pulled and the seal has to be replaced.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Posted By: DrAllis
Date Posted: 25 Jul 2026 at 8:21pm
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Unless this was done by an experienced old A-C mechanic, he simply installed the rear seal WRONG. This assumes of course it is the rear seal actually leaking. Did he replace the clutch shaft seals (2) ??
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Posted By: Putnamd17
Date Posted: 27 Jul 2026 at 7:43am
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After looking at it some more I’m thinking it may be hydraulic oil? It appears to have oil dripping off the shaft in there and the hydraulic fill cap was plugged up where the air is supposed to escape could that have been the issue? If so I’m assuming I’ll need to replace that seal?
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Posted By: 8070nc
Date Posted: 27 Jul 2026 at 8:07am
I dont know what Doc would say but if it was mine id get that cap un plugged and try it a little while. When that resivoir heats up it will pressurize with the vent plugged and force oil out the seals
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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor
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Posted By: DrAllis
Date Posted: 27 Jul 2026 at 8:14am
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I never try to dive into something unless I know for sure it needs diving into. Make your breather work and run it awhile. Remember, now that there has been oil leaking in that area, it's going to drip slowly for a long time, even if the source of the leak stops. EDIT: I always replace those two clutch shaft seals when the tractor is split. I always remove the bronze bushing inside the hollow shaft (and throw it away) for easier gear shifting. I always replace the throwout bearing even tho the clutch may not get changed. I have to. I can't be splitting something twice.
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