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Allis Chalmers Discussion Forum
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Smoking D-10

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Scott in SC

11-21-2003 03:48:13




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Bought the D-10 referenced in "D-10 Again" below. Smokes like crazy. Checked the compression. Was 130-140 on all cyl. Isn't that plenty? Where is the oil coming from? Thanks, Scott




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Chris in N.Y.

11-22-2003 20:20:05




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 Re: Smoking D-10 in reply to Scott in SC, 11-21-2003 03:48:13  
If you act quick there are a set of allis chalmers name tags for the hood on EBAY right now , they fit a D10 or D12.



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steve

11-21-2003 17:27:38




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 Re: Smoking D-10 in reply to Scott in SC, 11-21-2003 03:48:13  
"new" the valves have .0025 to .004 clearance. book says they are "bad" when it gets to .008... i have heard of some guys putting valve seals on the older motors when the guides are marginal. you appear to have good piston bores (no ridge) was the motor rebuilt?. maybe the did not do the head. if guides are not too far out of spec, i would guess they broke the oil rings on a piston or two during installation. compression rings can be o.k. normally oil leaking past valve guides will show burnt buildup in the intake port above the valve seat. bad rings dont show this. exhaust port will have burnt oil with valve or bad rings.

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TJ

11-21-2003 07:24:28




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 Re: Smoking D-10 in reply to Scott in SC, 11-21-2003 03:48:13  
Scott I work for CAT as service tech. If your engine is burning oil it could be coming down the valve guides. I restore allis tractors and have worked on many D-10 engines. Also I have had engines with good compresion and still had bad rings. A compresion test is not always acurate. Did you do it with a hot engine? Where all the plugs out? was the throttle open. Look at it this way if you have to put some money into it thats fine you will have a nice trator when your done. I have a D-12 III that I'll have probaly $6800 in by the time I get it done but I'll have a (brand new) D-12. Take $6800 down to your deere dealer and try to buy a 33hp tractor good luck! For me its a hobby not out for money that takes the fun out of it. Check your valve guides. You can buy new guides, valves, and springs for around $125. The machine work at NAPA would probaly be that again. If you have low oil PSI put new CAM rod and mains bearigs in make sure the crank is good. You could even hone the cylinders and ring and knurl the pistons unless they are super bad. If you aren't real mechanical thats fine, I am sure you can find some one to come over thats a mechanic and help you good learning for you to. Remeber always have a manual. And don't be afriad to get help I fix alot of stuff that people try to fix there self and in the long run it would have been cheaper to have someone do it. Good luck I hope you get it restored like new. If you need any engine specs or questions just put a post up.

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Scott in SC

11-21-2003 08:05:42




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 Re: Re: Smoking D-10 in reply to TJ, 11-21-2003 07:24:28  
Didn't buy this one to sell. My dad used to sell Allis-Chalmers in the 60s. I remember driving them around the lot with him at about 6 yrs. old. Have several: two Gs, a 160, and this one.Check out what I posted below and give me your opinion. Thanks again, Scott



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MapleStone

11-21-2003 07:23:51




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 Re: Smoking D-10 in reply to Scott in SC, 11-21-2003 03:48:13  
CONGRATS!!!

Glad to hear you bought it!

Give some details as to when you checked the compression. Warm/cold, just ran etc.

Other than rings you could have valve guide problems.

I have heard of rings getting stuck to pistons andnot doing their job right as well. Don't know what that would do to compression.

To unstick rings I have heard that if you put oil in the cylinders and let it soak for a few days then work the snot out of the engine (either real work like plowing or on a dyno) you might free the rings.

Just my thoughts anyway.

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Scott in SC

11-21-2003 07:54:03




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 Re: Re: Smoking D-10 in reply to MapleStone, 11-21-2003 07:23:51  
I checked the compression with the engine cold, throttle wide open.The pressure jumped to 120+ by the second stroke.Maxed at 130-140. I pulled the head.I'm not a mechanic, so bear with me.There is no "lip" on the cyl. wall at the top of the piston stroke. There seems to be very little if any wear. The tops of all the pistons were covered in oil.I pushed down on the valves one at a time and tried to move them back and forth. There is considerable "wiggle" in all of them. Local NAPA man seems to think its valve guides.What do you think? Oil pressure is good. The only thing that this tractor needs is the metal nameplate for one side of the hood, and the right hand cover below the fuel tank. Also, I found the ser#. Wasn't looking close enough.It is 10 7647. Thanks for your help.Looks like I may have done okay. Scott

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