D 15 engine compression
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=152273
Printed Date: 13 Dec 2025 at 2:38pm
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Topic: D 15 engine compression
Posted By: ACinSC
Subject: D 15 engine compression
Date Posted: 20 Jul 2018 at 7:25pm
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Back in Jan before my son and I got my D 15 (gas) running the comp on 3 cylinders was 60 - 70 . One was about 150-160 . Probably put maybe a couplehours on it since . I checked the comp today and all 4 cylinders are about 150 . Guess a little run time helped it out . My question is it still doesn't seem to have any power . I did a complete tune up and rebuilt the carb . What should I check next ? THANKS !!
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Replies:
Posted By: Jk chalmers
Date Posted: 20 Jul 2018 at 7:32pm
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Did you check your rpms at full throttle? If there low maybe Stretched out governor spring?
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Posted By: ACinSC
Date Posted: 20 Jul 2018 at 7:38pm
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Jk , I don't know the first thing about the governor . Gonna get my shop manual out and see if I can figure it out . THANKS !!
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Posted By: Jk chalmers
Date Posted: 20 Jul 2018 at 7:40pm
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High rpms between 2175 to 2225 is where it should be..
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Posted By: Jk chalmers
Date Posted: 20 Jul 2018 at 7:47pm
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Check the air filter and possible fuel bowl screen clogged are probably the most simple things. Another thing is sticking valves but if your compression is good I doubt that’s the case.
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Posted By: Glen S.C.
Date Posted: 20 Jul 2018 at 10:01pm
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I also have a D15 ser 2 and am located in Irmo . May be of some help if we are close.
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Posted By: ACinSC
Date Posted: 21 Jul 2018 at 7:49am
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Should have said this is a Series 1 . Also that I've already pulled the gas tank and cleaned it out , and I have a new sediment bowl and screen . Lastly I've tried running with the air filter hose off . Made no difference . Glen , I sent you a message . THANKS to all !!
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Posted By: Dick L
Date Posted: 21 Jul 2018 at 8:25am
With a compression of 150 all you need for horse power is a proper fuel air mix and spark at the proper time. The spark has to be at the proper time at the different engine speeds. After reading what you checked I would check the distributor advance for movement. You should be able to remover the distributor cam and feel the advance movement by twisting the rotor back and fourth feeling the spring pulling it back.
Setting up the carburetor would be to get the slow idle set to where it will slow idle and when taken to wide open quickly it does so smoothly. When the idle is set open the throttle wide open and adjust the power jet needle to the highest RPM possible the turn the needle back in until you detect a slight lower RPM. Then try it out.
I suspect a out of adjustment carburetor or a sticky or frozen advance.
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Posted By: Gary Burnett
Date Posted: 21 Jul 2018 at 9:01am
Do you have the firing order right?
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Posted By: ACinSC
Date Posted: 21 Jul 2018 at 6:15pm
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Pulled the sediment bowl today . Screen was clean , had some rust? in the glass bowl that I cleaned out . I have a timing light , not sure how to check the timing on this tractor . Done it a few times on old Chevys . I did recheck the firing order Gary . THANKS for all the advice
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Posted By: ACinSC
Date Posted: 21 Jul 2018 at 6:18pm
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Dick L , now I understand . Pull the dist cap and twist the rotor checking for tension . I'll give it a try . THANKS !!
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Posted By: ACinSC
Date Posted: 22 Jul 2018 at 10:53am
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Pulled the dist cap and have tension turning the rotor clockwise . None counterclockwise . Also hear a tapping noise . THANKS
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Posted By: Dick L
Date Posted: 22 Jul 2018 at 12:38pm
That would be about right. Not running the advance would be in TDC position if it is static timed at TDC. As the RPM's come up it will advance with the centrifugal force from the spinning.
I don't understand the tapping and where you talking about.
To use your timing light you can get the power from the battery direct with the other wire to number one plug. The light has to point to the timing marks. You can check static TDC by hand cranking the engine slowly.
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Posted By: ACinSC
Date Posted: 22 Jul 2018 at 1:03pm
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I hear a tapping noise when I twist the rotor back and forth . Like something is loose . THANKS
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