Trouble torquing D14 head bolt
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=182162
Printed Date: 19 Jul 2025 at 1:06pm
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Topic: Trouble torquing D14 head bolt
Posted By: CraiginMO
Subject: Trouble torquing D14 head bolt
Date Posted: 30 Jul 2021 at 5:09pm
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I have one of the short head bolts that is not stretching but will not go above 60ft lbs. Could the threads in the block be bad? They all looked good when I started. |
Replies:
Posted By: Ed (Ont)
Date Posted: 30 Jul 2021 at 5:45pm
| Take the bolt out. Check length of bolt and length of hole. Check all threads. Maybe run tap into hole. Hole is not full of liquid or something? |
Posted By: DaveSB
Date Posted: 30 Jul 2021 at 7:18pm
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When I rebuilt my D14 a couple of years ago, I had the same problem, except with all the bolts. I think the book calls for 85 ft pounds or so of torque, but at 70 all the bolts would start stretching and stretching and would go no tighter or they would ring off. I got on this forum and everyone told me yes 85 is correct, your bolts must be bad, so I bought new studs, good ones, not cheap and they did the same thing. Then one poster said to put them to 60 and forget about it, maybe retorque to 60 after run in, so that’s what I did, torqued them all to 60 and retorqued after break in. I’ve had no problem in the years since and I run and work the tractor pretty hard. I can’t tell you what to do, but if it was mine I’d put them all at 60 and forget about it. ------------- 1948 C, 1953 CA, 1948 WD, 1961 D-17 Series 2 Diesel, 1939 WC, 1957 D14 |
Posted By: CraiginMO
Date Posted: 30 Jul 2021 at 7:26pm
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So I pulled the head and the threads look fine. I got a shorter grade 5 bolt and torqued it in to 80 but that was it. I think it was the combo of my adding the Snap On ratchet device to the wrench and adding a grade 8 washer under each bolt. The parts manual calls out a washer but under only one bolt. Does not say which bolt but I assume its the tall one in the center. So I will have t order another head gasket and install the bolts with no washers and remove the ratchet from the torque wrench. If I can get 70 I will call them all good. |
Posted By: CraiginMO
Date Posted: 30 Jul 2021 at 7:28pm
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Thanks Dave, I will get new bolts and follow your advice. Thanks |
Posted By: CraiginMO
Date Posted: 30 Jul 2021 at 7:30pm
I pulled the head and checked all are good. I will get new bolts and gasket and call it a day.
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Ed (Ont) wrote:Posted By: DrAllis
Date Posted: 30 Jul 2021 at 8:30pm
| 80-85 ft lbs on a 7/16" bolt has to be grade 8 quality, not grade 5. Check the marks on the bolt head....gr 8 is 6 dash marks. |
Posted By: AC720Man
Date Posted: 30 Jul 2021 at 8:33pm
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All threads should be cleaned out with a tap and blown out. Makes a big difference as the bolt goes in and helps to prevent cross threading and the above problem. ------------- 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 |
Posted By: MACK
Date Posted: 30 Jul 2021 at 8:33pm
| Sounds like soft washers under bolt heads. MACK |