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Allis Chalmers Discussion Forum
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D12 Timing

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Donald Gay

01-05-2008 18:01:56




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I need help timing my series III D12, I have just rebuilt the engine and I am having trouble getting the distributor timed.
The flywheel has 3 marks: "Fire", "-25" and "center".
The issue is when it is coming up on the compression stoke on the #1 cyl the "center" mark is no where near the inspection hole. Whenever I rotate the flywheel so I can see the "center" mark in the inspection hole the #1 cyl is in the down position.(what am i doing wrong? Also: I know the firing order is 1243 so I am guessing that the distributor needs to be set with the rotor button on the #1 wire?

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Donald Gay

01-06-2008 17:50:51




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 Re: D12 Timing in reply to Donald Gay, 01-05-2008 18:01:56  
What I meant by rebuilt is just that. I completly took the enigne apart, turned the crank, put the new rings and bearings. I did align the two marks on the crank shaft and the cam just as the manual stated. As for the proper loctaion of where I am looking. I am looking through the inspection hole on the left side of the tractor just below the fuel bowl on the gas tank.



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Dick L

01-07-2008 14:05:18




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 Re: D12 Timing in reply to Donald Gay, 01-06-2008 17:50:51  
OK, For now lets forget the flywheel. If you have the head on, take the plugs out if they are in. Make the front piston is at the top on compression stroke. Take the valve cover off if it is on. Are both valves closed on the front cylinder. If they are you can time it close enough to run where it sets by pointing the rotor to number one plug wire.



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Dick L

01-06-2008 13:22:07




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 Re: D12 Timing in reply to Donald Gay, 01-05-2008 18:01:56  
You better give what all you had apart/removed from the block in your rebuild. As I keep stating rebuild has so many different meanings. I would like to assume when I read (rebuilt the engine) that the crankshaft was removed and new Bearings and seals were installed. In doing what I assumed was done in a rebuild the location of the TDC or CENTER would be checked with the crankshaft and timing gear marks being in line up and the number one piston being at the top of its stroke. I would also assume that the person checking would know the number one piston was the one closest to the timing gear. The governor gear on that engine will not have a timing mark but the timing gear would have two marks on it. One being a line and the other being a dot. The dot is for timing a magneto and has no use when using a distributor. My hope for you would be that if you had the crankshaft and cam out that this is all old news to you and does not help you find your problem. The flywheel will only bolt fast with (all four bolts in) one way. The onlu other thing I could thik of is you are not looking in the right location for the TDC on the bellhousing/torque tube.

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