Smokey
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=108148
Printed Date: 11 Sep 2025 at 3:06pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Smokey
Posted By: Hubnut
Subject: Smokey
Date Posted: 27 Jun 2015 at 5:51pm
|
Bought a B that "runs great" according to PO. It had the flywheel off and they'd put the tractor back together and never got around to fixin it. I come alone and buy it. Put a new ring gear on, resurfaced the flywheel, new clutch. Start her up. Great oil pressure. Smokes like a fiend! Tried a bottle of ZMax. Smokes worse! I see oil seeping out of the exhaust manifold in one spot. The engine runs like a sewing machine. Question: Is it worth it to rework the head and hope this is where the oil is coming from? My guess is the valve guides are toast. If I don't have to do the bottom end I'd like that. |
Replies:
Posted By: Wdtractorman
Date Posted: 27 Jun 2015 at 9:12pm
| I really dought it getting enough oil though the valve guides to make it smoke really bad. unless the oil return is stoped up wich I believe are the holes the push rods are though so I don't think that very likely. But I'm wrong about as much as right so other opinions would be good lol. |
Posted By: CTuckerNWIL
Date Posted: 27 Jun 2015 at 9:48pm
|
Get a couple cans of Seafoam and run some thru the tank and some in the oil. WOrk it hard for a full tank of gas and see what happens. Might blow a lot of crap out the muffler!
------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: allis in the ozarks
Date Posted: 28 Jun 2015 at 12:52am
|
Id say yall need new piston rings an possibly all new pistons an liners ------------- allis: wd, 180, 190xt, 200, 210 "I had the right to remain silent, but I didn't have the ability" Ron White "Go ahead, make my day" Clint Eastwood |
Posted By: Hubnut
Date Posted: 28 Jun 2015 at 6:15am
|
Thanks guys. I've been working it hard. Funny, the smoke is worse at idle. It nearly disappears when you're at high idle or working it. Ideas about that? |
Posted By: nella(Pa)
Date Posted: 28 Jun 2015 at 7:14am
| Is it gas smoke or oil smoke. If it is oil smoke read your spark plugs to tell which cylinder. If it is gas smoke check the needle valve settings, carberator float valve, float level. |
Posted By: Hubnut
Date Posted: 28 Jun 2015 at 7:26am
| Definitely oil smoke! |
Posted By: Steve in NJ
Date Posted: 28 Jun 2015 at 10:11am
|
Pulling each Spark Plug can give you an pretty good indication on what's taking place inside the engine. If 3 out of the four plugs are just sooty or clean and one is oily, which ever cylinder that oily plug came out of is your problem child. Could be a valve guide, or could be a ring issue in that hole. If there's oil seeping out around the manifold area, the problem hole is probably that one. The problem with taking a chance on doing the top end is, you don't know how good the bottom end is to hold compression. That's a 50/50 chance there. If its pretty dirty or murky in the top of the engine, and the oil is pretty dirty, chances are that engine wasn't taken care of well and could be pretty worn both top and bottom. You mentioned the smoke disappears when you work it, and smokes when idling. That to me sounds like the guides are worn like your thinking. Tough call on that one.... Steve@B&B ------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife |
Posted By: Hubnut
Date Posted: 28 Jun 2015 at 12:13pm
| Thanks Steve. I pulled the plugs and they are all oily. I'm thinking a rebuild is due. Too bad. The oil is currently diluted with the zmax stuff, so I plan to run her daily for 10 minutes or so for about a week. Then I will change the oil to 40 wt. and try her out. The oil in her is really thin. I also plan to do a compression test this afternoon dry and wet to see what happens. |
Posted By: Orange4ever
Date Posted: 28 Jun 2015 at 1:13pm
|
My dad says check your valve clearance, you can also get a air hold and take the intake and put new valve guide seals in it. First you set the valves and run it hard. You can also take the air cleaner off and make sure there's no mud dobbers in it. After doing all this and you still have smoke take the air cleaner off it, get you some Bon amme and run that through your hands and let it get sucked into the engine. Sometimes when engines idle a lot they get a glaze on the cylinder walls and rings will not seat, causing blowby and oil consumption. The Bon amme is a soap product, will score the cylinder walls, and cause the rings to seat again. This only works on engines with out turbo. It has worked for us, mainly on caterpillar dieasles. ------------- If you want a man to be a successful farmer, give him a Allis Chalmers tractor. If you want him to be a successful mechanic, give him a John Deere |
Posted By: Hubnut
Date Posted: 28 Jun 2015 at 4:08pm
|
Thanks orange4ever. I set the valves again. All were pretty close. I also ran a compression test. Here are the dry and (wet) numbers: Number 1: 120 (120); Number 2: 120 (128); Number 3: 115 (125); Number 4: 115 (125); I don't know what normal is supposed to be, but the increases with oil strongly suggest bad rings. Dang it! I really didn't want to have to rebuild this engine. |
Posted By: Orange4ever
Date Posted: 28 Jun 2015 at 7:54pm
|
Bon ami( mis-spelled it in the first post) will fix that and you won't need to go through the engine. Put it in the intake when the motor is running at half throttle, right at the carbuator, not the air cleaner. It is a soap product, will cause the rings to seat, and stop the oil consumption if the cylinder is glazed, and it will not harm the motor. I've done this to caterpillar D7- 3ts and it has cured them. It will save u a tear down. But there is a big difference between a B and a D7-3t on rebuild price. ------------- If you want a man to be a successful farmer, give him a Allis Chalmers tractor. If you want him to be a successful mechanic, give him a John Deere |
Posted By: Dick L
Date Posted: 28 Jun 2015 at 8:32pm
Ten hours a day would be better if your using ten anything. (:^D Ten minutes will not solve anything. It takes time to dissolve carbon gum crud. |
Hubnut wrote:Posted By: Hubnut
Date Posted: 28 Jun 2015 at 8:34pm
| Thanks Dick. I was hoping you'd chime in. I'll keep at it. |
Posted By: Dick L
Date Posted: 28 Jun 2015 at 9:00pm
| With that kind of compression you would have plenty of power. My guess is still stuck oil rings and the Z max will work its way into the stuff making the rings stick and dissolve it in time. It will work best when the engine is kept warm for an extended time. Normally bad valve guides that cause smoke well past warm up time will not let you have high compression readings. The valve wallows out the seat when the guide is that sloppy and causes burning of the valve. A lot of good running B's and C's with compression readings in the 80's that don't smoke. |
Posted By: Hubnut
Date Posted: 29 Jun 2015 at 5:28am
| Thanks Dick. That sounds like good news. I'll be patient and let the zmax do it's job. I'll keep you updated. |
Posted By: Bill Long
Date Posted: 29 Jun 2015 at 6:18am
|
Hubnut, Thanks for taking such good care of my favorite. Hope it works out without a lot of extra work. To me it has been a long time, but the compression test seems to be OK. I have to admit I have never heard of some of the remedies listed above. However, they come from excellent mechanics so listen closely. Let us know how it goes. Thanks again for taking such good care of my favorite. Good Luck! Bill Long |
Posted By: wekracer
Date Posted: 29 Jun 2015 at 8:22am
| Dad has talked about Bon Ami but I have never tried it. He says it works. But your compression is good and oil pressure is good. It's not uncommon for engines to smoke after they have been sitting for a while I would keep running it. Run sea foam in the gas and oil treatment and I bet it will clear up. Best thing to do is put it on a brush hog or something that will get it warm and work it. |
Posted By: Dick L
Date Posted: 29 Jun 2015 at 8:27am
| The quickest way would be to pull the pistons out and clean up the oil rings but I have never been successful in removing all the stuck rings without breaking at least one. When I get a couple of the rings off I seem to think if I pry just a little more the ring will come and pop I have two or more pieces. Two kinds of oil rings in all that I have taken out on these engines. The ones that do not have the steel scraper rings seems to break easy when stuck. With that high of compression I would also guess that it has not run all that many hours since it had new parts. Oil in the cylinders will bring up the compression some in a new engine. |