D 15 Series II engine question
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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=209302
Printed Date: 11 Dec 2025 at 1:10pm
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Topic: D 15 Series II engine question
Posted By: jpi72
Subject: D 15 Series II engine question
Date Posted: 10 Dec 2025 at 2:15pm
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I own an AC forklift with a D15 Series II (160 cu. in) engine. Cylinder 3 has zero compression currently. It happened quite suddenly. Does this engine have head problems? We are planning on taking the head off after Christmas. Joel
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Replies:
Posted By: DSeries4
Date Posted: 10 Dec 2025 at 2:39pm
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It's a stout engine with no known issues. Could be a stuck valve? You won't know until you open it up. ------------- '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 |
Posted By: DiyDave
Date Posted: 10 Dec 2025 at 3:26pm
#'s 2 and 3 are closest to the upright muffler. Could be as easy as rust hanging a valve open... ------------- Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need! |
Posted By: steve(ill)
Date Posted: 10 Dec 2025 at 3:50pm
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take the valve cover off and look at the valves now... then you can narrow down any work on the head ... ------------- Like them all, but love the "B"s. |
Posted By: WF owner
Date Posted: 10 Dec 2025 at 5:31pm
I have a D-15 II that I bought at the end of May 2025. It had a skip. When I did a compression check, #2 and #3 were down considerably on compression compared to #1 and #4. Here's what i found when I removed the head. |
Posted By: steve(ill)
Date Posted: 10 Dec 2025 at 5:41pm
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since #2 and #3 are 180 degrees apart, you would think if the head gasket was blown, youi would have zero compression on both cylinders ?? ... when one cylinder is on COMPRESSION, the exhaust valve is open on the other cylinder.. ------------- Like them all, but love the "B"s. |
Posted By: WF owner
Date Posted: 10 Dec 2025 at 5:57pm
| It was a while back, but I believe I had about 60 psi on 2 & 3 and close to 150 on 1 & 4. |
Posted By: WF owner
Date Posted: 10 Dec 2025 at 6:07pm
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Here is a link to my post about it. https://www.allischalmers.com/forum/d15-series-2-skipping_topic207345_post1775129.html?KW=D%2D15#1775129" rel="nofollow - D-15 Series 2 skipping - AllisChalmers Forum
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