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Allis Chalmers Discussion Forum
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WC Question?

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Tim Tenn.

11-30-2005 14:27:19




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When I increase the throttle on my WC it pop's and backfires out the exhaust. Changing the timeing doesn't make a differance. Carb adjustment doesn't help. I checked the compression and it reads between 55 and 60 lbs on each cylinder. I suspect a burn't exhaust valve. It runs fairly smooth at idle, but when I rev it up it will shoot fire out of the exhaust and backfire. The Firing order is correct. I removed each plug wire while running and #4 cylinder doesn't change much.

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Tedder

12-02-2005 04:20:08




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 Re: WC Question? in reply to Tim Tenn., 11-30-2005 14:27:19  
I had a WD once with a recent overhaul and it acted like you describe. After alot of fooling around I pulled the head and found 2 scored cylinders. It turns out that the wrist pins were installed wrong. It only would run erratic when warmed up especially at high idle. I guess what was happening is the wrist pins would turn red hot and cause preignition and backfiring. Compression was about 75 pounds for all 4 cylinders even with 2 cylinders scored. Compression should be higher than that but it had wd45 pistons installed which are wrong.

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chalmersbob

12-01-2005 19:31:40




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 Re: WC Question? in reply to Tim Tenn., 11-30-2005 14:27:19  
try new plugs. #4 might be dead and only fires now and then causing backfire. bob



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LWD

12-01-2005 07:49:26




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 Re: WC Question? in reply to Tim Tenn., 11-30-2005 14:27:19  
give it more gas.



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steve from mo - dangit!

12-01-2005 06:55:09




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 Something else to check. in reply to Tim Tenn., 11-30-2005 14:27:19  
Check the point setting at each lobe of the rotor. You might have a flat one. You may still have a valve set wrong or burned/chipped/broken.



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J.C. IN AZ.

12-01-2005 06:25:42




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 Re: WC Question? in reply to Tim Tenn., 11-30-2005 14:27:19  
My guess is that your valve to Lifter Spacing is too close. Run the valves at idle,then back off each lifter until it clicks and then close it down till the click just about disappears then tighten set screw.Valve lifter all set, then check timeing . To much advance will allow a smooth idle but a high RPM that is errratic.Don't think your Carb. is at fault.This would be my procedure for a solution to a problem such as you have. John

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Tim Tenn.

12-01-2005 05:23:13




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 Re: WC Question? in reply to Tim Tenn., 11-30-2005 14:27:19  
Thank you all for your responses. To answer some of your questions, the engine was at full operating temp. I did install new points cond. cap roter. This tractor was rebuilt with 4 1/8 pistons. It has been sitting for a long time maybe 15 yrs, but the engine was not stuck and fired up very easy. I have good oil pressure. I do remeber that it never ran right after it was rebuilt. It wasn't used very much after the rebuild because the transmission went out. I will try your suggetions and see what happens.

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gene (missouri)

11-30-2005 20:18:23




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 Re: WC Question? in reply to Tim Tenn., 11-30-2005 14:27:19  
With the compression even - try the compression test again. Once dry and again wet (add a couple of tablespoons oil to each cylinder - roll the engine over a couple of times - then test). The compression should come up a bit on the wet test. If you have a bad valve the cylinder with the bad valve will not increase or increase as much as the other cylinders.

Depending on which set of pistons you have and if you are hand cranking - 55 lbs psi would not be a bad reading - perhaps about 10 psi low from a new engine.

The answer could be the valves, carburation, or ignition.

Good luck,

Gene

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BushogPapa

11-30-2005 19:34:50




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 Re: WC Question? in reply to Tim Tenn., 11-30-2005 14:27:19  
Are you talking about "Cold" or after it is FULLY warmed up..???

Maybe you should open the power screw 1/4 turn, too....

Those old AC's are cold-blooded...!!

Ron..



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old

11-30-2005 16:35:56




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 Re: WC Question? in reply to Tim Tenn., 11-30-2005 14:27:19  
Your compression is low, may be bad valse of stuck rings. I'd put about 1/4 cup of tranny fluid in each cylinder and let it sit for 24 hours and then see if it runs better.



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Leon in Mn.

11-30-2005 16:23:41




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 Re: WC Question? in reply to Tim Tenn., 11-30-2005 14:27:19  
Tim, check your points. It sounds to me like they could be too close together. Make sure they are good and clean, not pitted. Measure and adjust the correct gap between them when they are at the high spot of the cam lobe, when open all the way. Also valve adjustment? Maybe the valves for that #4 cylinder (or all of them) could use adjustment. Hope this helps you. Good luck!



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