D14 head gasket questions
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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=125603
Printed Date: 15 Sep 2025 at 11:57pm
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Topic: D14 head gasket questions
Posted By: bobkyllo
Subject: D14 head gasket questions
Date Posted: 08 Jul 2016 at 4:53pm
| So my d14 has always smoked since I've bought it. I figured it was valve guides and I'd take care of it this winter. Well I went to use it the other day and I noticed some oil dripping from the top of the radiator. I opened the radiator and the fluid has an oil feel to it and does not look right. The smoke also does not smell like it's just oil burning. It's it possible that the head gasket has going bad? Or what else could be allowing oil and water to mix? |
Replies:
Posted By: Dan73
Date Posted: 08 Jul 2016 at 4:59pm
| Most likely the head gasket. I forgot how you check but the other likely cause is the orings that seal the sleeves to the block. These motors have wet sleeves which means there is a orings on the outside of the sleeve about half way down which separates the oil from the water. The orings can fail simply from age. |
Posted By: Dan73
Date Posted: 08 Jul 2016 at 5:02pm
| Oh if you pull the head I would recommend replacing the head bolts with with new bolts from arp. I just rebuilt a d15 and the old bolts wouldn't hold torque one ended up snapping off but I was lucky and was able to get it out before it broke in two. I know alot of people reuse these head bolts but figured I would pass along what happened to me recently. |
Posted By: bobkyllo
Date Posted: 08 Jul 2016 at 5:19pm
|
Thanks Dan. If the o rings fail wouldn't i get antifreeze in the oil pan instead of oil in the radiator? |
Posted By: Dan73
Date Posted: 08 Jul 2016 at 5:22pm
| Does the oil look milky? I would expect in either case if oil can make it to the coolant system coolant could make it to the oil system through the same leak point. |
Posted By: DiyDave
Date Posted: 08 Jul 2016 at 6:15pm
| If the exhaust has the sweet smell of antifreeze in it, then its a pretty good bet that the head gasket is the culprit. IF you take the head off, its always a good idea, to have the head pressure checked, to make sure it aint cracked, too... |
Posted By: bobkyllo
Date Posted: 08 Jul 2016 at 7:14pm
| The oil does not look milky. That was the first thing I checked. I always have the heads checked for cracks and other blemishes when I have them off. It sounds as if the heads coming off |
Posted By: Dan73
Date Posted: 08 Jul 2016 at 7:18pm
| I think others have said if you remove the oil pan first you can check the o rings but I don't know just what you are looking for. |
Posted By: Dick L
Date Posted: 08 Jul 2016 at 8:28pm
| Check the core plugs under the rocker arms for pin holes. I would check that real close unless you want to do a valve grind with new guides. If that is the case you can check it all out after the head is off. |
Posted By: DiyDave
Date Posted: 08 Jul 2016 at 8:46pm
Take the oil drain plug loose, and stick a paper towel against the plug, if you see AF wicking into the paper towel, you might want to drop the pan. What you are looking for is AF leaking from the bottoms of the cyl liners. Sounds like this ain't your first rodeo...
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bobkyllo wrote:Posted By: bobkyllo
Date Posted: 08 Jul 2016 at 8:54pm
| Thank you guys. I'll tear into it in the morning. I might pull the pistons and put rings in it while I'm at it because it does burn oil and I'll be in it any ways |
Posted By: Dan73
Date Posted: 08 Jul 2016 at 8:56pm
| If you pull the pistions I would do the o rings not that much more work to know you replaced the old rubber or whatever they are parts. |
Posted By: MACK
Date Posted: 09 Jul 2016 at 10:34pm
| There is no way oil can get into coolant from sleeve o rings . It has to come from where oil pressure is near coolant or the bucket you filled radiator with. MACK |