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Allis Chalmers Discussion Forum
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D-17 won't start

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Dyahn

07-11-2005 05:24:30




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I just put a new head gasket on my series III gas engine and I can't get it to start. I'm pretty sure that I didn't mix the spark plug wires but it sounds like it's not timed. When I pulled the rocker arm rail off and pushrods out I was careful to keep everything in the same order but I suspect that the problem is there. Is it possible to mess up the valve clearances by taking the rail off and on? I have the IT shop manual, just started trouble shooting the engine, and am having trouble getting the #1 cylinder to TDC. I assume that the cylinders are numbered 1 to 4 from the front to the back of the engine.

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Butch(OH)

07-11-2005 11:49:31




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 Re: D-17 won't start in reply to Dyahn, 07-11-2005 05:24:30  
It is good to keep the parts in order due to wear patterns but lots of people throw them in a bucket and don�t worry about it. Parts order is not your problem, you need to set your valves whether you kept the parts in order or not. What troubles are you having finding TDC #1? Yes it the cylinder closest to the radiator. The flywheel is marked "TDC". Center it in the timing hole and you have two possible situations. #1 is either at TDC of compression stroke (where it needs to be to set the valves) or at overlap between exhaust and intake. Watch the #1 rockers as you are turning the engine (the direction it runs) and getting close to the TDC. If the intake valve is closing and the exhaust just starts to move you are at overlap and need to turn the engine one turn to TDC of the compression stroke. As you approach TDC (about the last 1/4 turn) of the compression stroke, neither rocker should be moving. When you have the engine at TDC of the compression stroke for #1 set the valves per the book spec. If the settings are hot settings add .003 to the exhaust and .002 to the intake for cold setting. Since your D-17 firing order is 1-2-4-3 you then turn the engine 1/2 turn (again, in the direction it runs) and set the valves for #2. Then 1/2 turn to TDC again and set #4, � turn again and set 2. Finally turn it another 1/2 turn and you will have #1 at TDC of the compression stroke once more. Assuming you did not disturb the distributor timing pull the cap and put the #1 plug wire in the terminal that the rotor is pointed at. Proceeding around the cap clockwise install 2 then 4 then 3.

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Texas Denny

07-11-2005 20:13:03




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 Re: D-17 won't start in reply to Butch(OH), 07-11-2005 11:49:31  
Excellent explanation!



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Butch(OH)

07-11-2005 11:54:03




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 Re: D-17 won't start in reply to Butch(OH), 07-11-2005 11:49:31  
I should spend more time proof reading. After you set the valves for number 4 my post should say turn 1/2 turn to number 3.



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Dyahn

07-12-2005 04:03:35




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 Re: D-17 won't start in reply to Butch(OH), 07-11-2005 11:54:03  
Thanks for the explanation. The tractor is located about 90 miles away me so I won't be able to get to it until later this month. I can�t wait to try it. The book that I had identified half of the valves to be set with #1 at TDC and then the other half with #4 at TDC. Is there an easy way to bump the engine over without using the starter? The crankshaft bolt is pretty much blocked by the frame and radiator. Also, where is the timing hole? I know these are basic questions but I�m a newbe with tractor engines.

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Butch(OH)

07-12-2005 04:31:42




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 Re: D-17 won't start in reply to Dyahn, 07-12-2005 04:03:35  
To tell you the truth it has been 30 years since I tuned up a D-17 and can't remember where the timing hole is, all the older A-C had the mark on the flywheel and a hole on the side or bottom of the bellhousing to time. It may even have timing marks on the front pulley and a pointer on the cover. It seems to me that Dad's D-15 was that way, hopfully a '17 owner will chime in with the location. Several ways to turn the engine, if it has a belt pulley put it in gear and turn it with a socket and ratchet. A disgaureded PTO stub slipped over the PTO shaft and a bar or pipewrench will turn it also. If nothing else you can jack up one rear wheel, put the trans in 4th and the Power Director in high and turn it with the rear wheel. Take all the spark plugs out first and save yourself a lot of effort.

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Dyahn

08-09-2005 04:09:23




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 Re: D-17 won't start in reply to Butch(OH), 07-12-2005 04:31:42  
I finally was able to get back to the tractor last weekend. I jacked up the rear wheels and spun both wheels in either direction. The engine didn't turn over - a guy at work suggested that this might be a safety issue to prevent someone from doing a rolling start by popping the clutch. So, it looks like I'll try to turn the PTO instead next time I get some time. Now the question...Where is the timing hole? I did find a 1-inch open hole(no threads to screw in a plug) in the bell housing close to the starter and parallel to the axles. Lookig in it with a flashlight, I can see the side of the flywheel. While bump starting the engine, I see a scribe line on side of the flywheel but no other markings. I also didn't see any other holes or pipe plugs in the front of the the bell housing. I thought that the timing marks would be on the face of the flywheel and not on the side of it. If that's the case, there has to be some other hole in the bell housing. Any help would be greatly appreciated. Thanks!

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