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Allis Chalmers Discussion Forum
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AC G burns oil

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msheaffer

11-18-2006 14:17:56




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I have a real nice AC G that has been our main seeding and cultivating tractor for 5 years now. Lately it will burn oil until it drops to a certain point then the engine sounds better and stops blowing smoke. However, according to the dipstick I should be adding oil to the crank case. I've put spacers in three of the plugs without any benefit seen. Any advice would be helpful. Thanks.




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noncompos

11-20-2006 21:11:25




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 Re: AC G burns oil in reply to msheaffer, 11-18-2006 14:17:56  
Well, you did say any advice:
1:You didn't say how low your oil got before it stopped smoking, but in my youth there were someone's engines( I think Chry Cptn L-hds) that had habit of using up the first quart of oil quickly, then not using any more to speak of. We just ran them a quart low, BUT they were 5qt (6 with filter) engines, so there were still 4 qts to circulate.
2: :"Burns oil...to certain point...then sounds better...stops blowing smoke" (Fascinating!!) Unless it's an idiosyncrasy of that model engine,if rings, valve guides etc bad, generally doesn't stop smoking when oil level drops 'cuz the oil is still being pumped to everything...is there any system on that engine that could suck oil into the combustion chambers only until a certain crankcase level is reached?? (especially if the "running better" sounds like it's getting just gas instead of a mixture of gas and oil). Good luck.

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Plant Doctor

11-20-2006 04:27:51




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 Re: AC G burns oil in reply to msheaffer, 11-18-2006 14:17:56  
Msheaffer: We farm vegetables in the Southern part of NJ and on sandy ground. Between myself and my two neighbors we have six "G" for cultivating and they all end up in my shop for repairs. Our sand here produces a lot of dust and in the past we have had some problems keeping the "G" engine together do to dirt which I believe gets into the engine through the small oil bath air filter. It has been our experience that when they start burning oil as you described yours is doing, rings alone isn't the answer. That engine, the N62, only has two main bearings and we have found that when the rings are worn to the point of needing replacing, it's also time to replace the bearings. The pistons are removed from the bottom. Remove the pan and the head, remove the rod caps and see if you can push the piston up and out of the cylinder so the rings can be removed. There may be a problem doing this if there is a ridge in the top of the cylinder do to engine ware. If this is the case you can remove the ridge with a ridge reamer or try to get the pistons out through the bottom which is a pain in the &^&*$. But, I suggest if there is enough ridge in the top of the cylinders to prevent the pistons from coming out the top, then the cylinders are worn to the point where they should be bored out and new pistons installed. We have installed paper air filters before the oil bath filters and we now change the oil weekly when we work them hard. This has almost stopped our engine repairs on the "G". These are great little tractors, but old, they need all the TLC you can give them if you work them hard. I hope this helps and good luck with yours.

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Dick L

11-18-2006 15:02:21




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 Re: AC G burns oil in reply to msheaffer, 11-18-2006 14:17:56  
If you dont run it low on oil to many times you probly can get by with a set of rings. They are not hard to do in the G. You just drop the pan and pull the pistons out the bottom. If you let them over heat the tension leaves the rings and they start to burn oil. The engine could need an overhaul but from what you stated I would guess a set of rings and a pan gasket would get you back where you would not burn oil.

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oldcraneguy

11-19-2006 07:26:15




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 Re: AC G burns oil in reply to Dick L, 11-18-2006 15:02:21  
Dick, Can you really get the pistons out the bottom without dropping the crank? Im not familar with the G but I understand its a small Cont. and Im wondering if you can get em back in with a ring compressor and all..sounds like it would be kind tight... meanwhile if I was in that deep Id wanna replace mains and rod bearings unless they were pretty much like new...just my opinion



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Dick L

11-19-2006 09:21:20




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 Yes You Can in reply to oldcraneguy, 11-19-2006 07:26:15  
You have to turn the crank back and forth. You can not take the pistons out the top anyway. The rods will not fit thru the holes. I like to push the piston up as high as it will go and put the rings on but I have big stiff hands. It really in not that bad getting the rings in the cylinders from the bottom. The first one may give you a fit or two but after that you will have it figured out. If you have not figured it out you might not should have started it without a little help. LOL!
It is always easier on a rotating engine stand but not necessary.

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