Farm Equipment - WD 45 Blue Smoke

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WD 45 Blue Smoke

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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=19634
Printed Date: 08 Feb 2025 at 6:33am
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Topic: WD 45 Blue Smoke

Posted By: ScooterBuck
Subject: WD 45 Blue Smoke
Date Posted: 18 Oct 2010 at 8:26pm

My fathers 45 is burning oil. It does not get used every day and rarely gets worked real hard but does not just sit around. I use it in the winter to move snow regularly. In the summer it opens ditches and works a little bit of ground. Dad was using it the sub soiler the other day and said he thought he noticed some blue smoke. Then later when it was idling he said it started smoking. He idled it up and it went away. A couple days later I used it to disc and thought I saw it blow one puff when I was hooking up. Used it for about an hour not noticing any smoke. Then when I idled it down and was unhooking, it started to smoke. It would occasionally miss when the puff of blue smoke came out. It would come and go a little not smoking every revolution. I didn't look into it any but I thought I would pull the plugs and find which cylinder is the problem. I guess my first step might be some kroil, hoping that it is a stuck oil ring. Any other advice? Could it be a broken piston? The engine does not have many hours on an overhaul. Thanks in advance.

Replies:

Posted By: CTuckerNWIL
Date Posted: 18 Oct 2010 at 8:35pm

I'm interested in replies to this. When it was OH was it worked to break it in? I have heard people say you should break an engine in like you plan to use it. Were the valve guides replaced in the OH?

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Posted By: mlpankey
Date Posted: 18 Oct 2010 at 8:43pm

Here in the southern parts of the U S we term what you are explaining as huffing . Huffing in southern definition is when the rings are worn or stuck to the piston or broken ring allowing oil from the cylinder walls to be pulled past the rings when decelerating. You say it wasnt long since freshened was the sleeves changed? Was the ring gaps staggered?

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Posted By: Gerald J.
Date Posted: 18 Oct 2010 at 9:04pm

Puffing blue smoke after slowing down rapidly can also be a sign of oil being sucked past the intake valve stems from them being worn and not having good valve stem seals. You get the greatest intake manifold vacuum (which also can lift oil past the rings) when slowing down from fast running.

I've also seen vintage tractors puff a bit of blue smoke because the owner has added some oil to the gasoline to "lubricate" the valves.

Watch the oil consumption, when it gets more costly than repair, then its time to repair and fix.

Gerald J.

Posted By: ScooterBuck
Date Posted: 18 Oct 2010 at 9:05pm

I can only assume the rings were staggered. It was a number of years ago when the engine was overhauled but not many engine hours ago. And yes the valve guides were replaced. I did not notice any blue smoke when I started it. Even idling cold unhooking the blade and installing the draw bar it did not smoke. Valve guide problem would usually smoke bad on start up wouldn't it.