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Allis Chalmers Discussion Forum

D-17 Series III Burning Oil

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Dave P.

05-16-2004 20:04:02

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Long time site fan, first time post. Have a 1963 series III D17 (gas) purchased about three years ago. Overall for an ancient machine it runs pretty good. Tractor was broken in half and motor and clutch rebuilt shortly before I purchased. However, cylinder head and valves were apparently not rebuilt. The thing burns quite a bit of oil and has since purchased (a quart every couple of hours). Besides bluish/whitish exhaust, some appears to be dripping down the exterior of the motor from one of the four exhaust manifold outlets. It may be coming out elsewhere since occasional drips show up at the bottom of clutch housing area, but these seem minimal compared to overall amount of oil consumed. Sounds like a valve job to me but thought I would solicit any other thoughts. What are the chances that the cylinder head will be worn beyond repair also? What tools are beyond the typical garage shop mechanic but needed for this job (i.e., what will I need to take to a real shop to have machined, ground, etc.)? And finally, will the valve kits sold (I think on this site?) contain all the parts I need? Thanks for any advice.

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05-20-2004 14:03:24

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 Re: D-17 Series III Burning Oil in reply to Dave P., 05-16-2004 20:04:02  
Dave; It sounds like to me you're problem could one of several, First, A wrist pin may have come undone and scored a cylinder. Pull the head and check cylinders for scoring.. Second check head gasket, a blown gasket can let oil into one or more cylenders with out water in crankcase or exhaust. third, Check head for cracks, worn valve guides and/or seats. Be sure and have head face checked for warpage. And fourth, Probably should have been first, check block for build up of gunk in oil drain back passages, plugged passages can restrict crankcase ventilation and the pressure will force oil past the rings and valve seals. Oh yeah, check valve seals as well, bad seals will cause oil burning too. Hope this helps, John

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05-18-2004 23:11:47

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 Re: D-17 Series III Burning Oil in reply to Dave P., 05-16-2004 20:04:02  
I would bet there is a good chance the piston pin has done some damage to the cyl. walls.
I have found this before when buying problem tractors.

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05-18-2004 04:07:52

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 Re: D-17 Series III Burning Oil in reply to Dave P., 05-16-2004 20:04:02  
Assuming the engine rebuild was done correctly, it probably is your head (even if it isn't, it should probably be done anyways since the rest of the motor was rebuilt). I would probably take the head off and take it to a (good) machine shop. Most shops can rebuild/refurbish the head for a pretty reasonable fee (anywhere from $75 -$300, depending on what is needed/done). That's the route I ended up taking.

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05-17-2004 04:50:30

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 Re: D-17 Series III Burning Oil in reply to Dave P., 05-16-2004 20:04:02  
If the cylinder walls are damaged, you can buy replacements sleeves, pistons, and rings for around $300. You can als get a valve kit from them. You should also think about looking at the gaskets (head gasket). If you do the work yourself, you would probably need something to pull the sleeves (sleeve puller) as well as some tools to remove the valves (valve spring compressor/valve guide puller, a valve guide retainer, and a puller) Try this link:

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Dave P.

05-17-2004 20:02:18

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 Re: Re: D-17 Series III Burning Oil in reply to Jordan, 05-17-2004 04:50:30  
Thanks for the advice. I did not clarify that the cylinders/pistons/rings/rods, etc. were rebuilt already. Again, think the only job I am facing is pulling the head/valve assembly and rebuilding. Thanks again for the info.

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05-17-2004 04:51:54

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 Re: Re: D-17 Series III Burning Oil in reply to Jordan, 05-17-2004 04:50:30  
Oh - if you take the pistons out you will need a ring compressor to get them back in. There are probably some more tools I am forgetting, but you can borrow/rent most of them.

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