Valve cover or inj 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=192762
Printed Date: 20 Sep 2025 at 6:49pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Valve cover or inj leak
Posted By: Mikez
Subject: Valve cover or inj leak
Date Posted: 06 Jan 2023 at 12:20am
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Hi Our 185 is wet around where injectors go into head. The fittings seem dry where lines go to injectors. Going to wash it all off and see if we can tell if it’s oil or fuel. Which is more likely. Injectors leaking at head or valve cover gasket leaking into that area.
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Replies:
Posted By: sparky
Date Posted: 06 Jan 2023 at 4:23am
You have a 50/50 chance between injectors leaking or the valve cover gasket. Both my 175 and 185 leaked the same way and in both cases it was the cover gasket. Clean it up good and replace the gasket and see where you are. A lot of folks want to start pulling lines and injectors when they should do the simplest and cheapest thing first. My long distance guess would be the gasket leaking. Good luck.
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It's the color tractor my grandpa had!
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Posted By: darrel in ND
Date Posted: 06 Jan 2023 at 6:17am
From my experiences (2 of them), it'll be valve cover gasket
Darrel
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Posted By: allisorange
Date Posted: 06 Jan 2023 at 6:45am
Very good chance its valve cover gasket. Had that on are 180.
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Posted By: DMiller
Date Posted: 06 Jan 2023 at 6:58am
Posted By: 160 allis
Date Posted: 06 Jan 2023 at 8:18am
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We've got 3 of them and all so far have been valve cover gaskets.
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Posted By: darrel in ND
Date Posted: 06 Jan 2023 at 10:35am
Score is about 10 to 0, valve cover gasket with a substantial lead!
Darrel
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Posted By: captaindana
Date Posted: 06 Jan 2023 at 12:16pm
Ok I’ll make it 11 to zip. On my 7000 I was ready to replace injectors Dr Allis said hold on cowboy probably the valve cover which guess what it was!
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Blue Skies and Tail Winds
Dana
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Posted By: Mikez
Date Posted: 06 Jan 2023 at 12:28pm
Thanks everyone
Was leaning towards valve cover
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Posted By: DSeries4
Date Posted: 06 Jan 2023 at 2:24pm
Do a smell test. You will find out pretty quick.
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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '63 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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Posted By: KJCHRIS
Date Posted: 06 Jan 2023 at 6:24pm
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I's say if you repair 20 of the AC 301 engines with leakage near the fuel injectors "19" will be valve cover leaking and "1" will be at the injector. I've seen "1" that had the sleeves on fuel return lines leaking The screws / bolts holding valve cover should be shouldered to prevent crushing the gasket. IF you do not have these, they are available from AGCO and come with instructions on installation. This change was done on 7020 tractor engines and was advised for all older engines.
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AC 200, CAH, AC185D bareback, AC 180D bareback, D17 III, WF. D17 Blackbar grill, NF. D15 SFW. Case 1175 CAH, Bobcat 543B,
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Posted By: captaindana
Date Posted: 06 Jan 2023 at 7:09pm
Yes when I replaced the valve cover gasket I installed the ‘new’ shouldered bolts and their associated ‘springs’.
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Blue Skies and Tail Winds
Dana
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Posted By: Mikez
Date Posted: 17 Jan 2023 at 6:47pm
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Well found most valve cover bolts were loose. But more surprisingly is there’s one keeper missing on a valve. Can we use 209103 keeper. I noticed the numbers crossed. Just wanted to check what you all thought
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Posted By: MACK
Date Posted: 17 Jan 2023 at 8:14pm
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If you have been running with one keeper missing, you must attend church regular. Some one is looking over you. MACK
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Posted By: Mikez
Date Posted: 17 Jan 2023 at 10:33pm
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Yes Mack we were amazed to see that. Tractor is new to us. Been sitting for awhile. We haven’t run it to to much. Been working the bugs out of it. We should have went and bought a lottery ticket after finding it lol. We don’t have any of the 4376497 keepers but have 209103 keeper. Are they the same. Thanks
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Posted By: captaindana
Date Posted: 18 Jan 2023 at 4:36am
Mike’s where’s the missing keeper??
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Blue Skies and Tail Winds
Dana
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Posted By: Mikez
Date Posted: 18 Jan 2023 at 7:47am
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Dana that’s a good question. Wish we knew
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Posted By: Mikez
Date Posted: 18 Jan 2023 at 12:27pm
And I can get shoulderd bolt kit for like our 6080 and that will work on this 185. Correct
Thanks
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Posted By: KJCHRIS
Date Posted: 18 Jan 2023 at 11:09pm
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As long as bolts same length and same quantity. Isn't a 6080 a 4 cylinder engine or is my memory off tonight. Order bolt kit #74036974 and be sure you have a sharp 3/8" drill bit to enlarge the 8 bolt holes. Gasket is either 4008074 or 74008074, my notes are smudged.
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AC 200, CAH, AC185D bareback, AC 180D bareback, D17 III, WF. D17 Blackbar grill, NF. D15 SFW. Case 1175 CAH, Bobcat 543B,
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Posted By: Mikez
Date Posted: 18 Jan 2023 at 11:23pm
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Opps meant to say 8000 tractors. Thank you
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Posted By: Mikez
Date Posted: 19 Jan 2023 at 9:08pm
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I assume you drill valve cover for the new shouldered bolt
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Posted By: SteveM C/IL
Date Posted: 19 Jan 2023 at 11:29pm
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I'd say so Mike. Got cover off 8070 right now and the holes are larger than 1/4 in.
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Posted By: captaindana
Date Posted: 20 Jan 2023 at 4:31am
The new shoulder bolt kit had direction sheet yes drill out holes per sheet I do t remember size good luck buddy
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Blue Skies and Tail Winds
Dana
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Posted By: Mikez
Date Posted: 20 Jan 2023 at 8:15am
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