compression WD
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=152289
Printed Date: 24 Aug 2025 at 10:29am
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Topic: compression WD
Posted By: LouSWPA
Subject: compression WD
Date Posted: 21 Jul 2018 at 1:03pm
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just out of curiosity, what should the compression be on a WD? I think it is the lower compression ratio, it has the kerosene manifold on it. I measure 40-45 PSI in all cylinders. It starts and runs fine ------------- I am still confident of this; I will see the goodness of the Lord in the land of the living. Wait for the Lord; be strong and take heart and wait for the Lord. Ps 27 |
Replies:
Posted By: Albert
Date Posted: 21 Jul 2018 at 9:21pm
| Take out all four plugs shut off fuel and open throttle wide open and retest again. |
Posted By: LouSWPA
Date Posted: 22 Jul 2018 at 8:56am
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that was with all four plugs out and throttle wide open. im thinking maybe compression gauge goofy. doesn't matter, tractor is running fine, so I think I'll let sleeping dogs alone ------------- I am still confident of this; I will see the goodness of the Lord in the land of the living. Wait for the Lord; be strong and take heart and wait for the Lord. Ps 27 |
Posted By: DSeries4
Date Posted: 22 Jul 2018 at 10:17am
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That seems very low in my opinion. My scrap yard D17 gets 150 lbs. ------------- '49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '63 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080 |
Posted By: HoughMade
Date Posted: 22 Jul 2018 at 10:37am
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A standard WD started life with 110#, a “low octane” WD with 80#. Tractors run fine with less than they had new all the time, but if it is running good with good power, I would think that 40-45# is not accurate. ------------- 1951 B |
Posted By: TramwayGuy
Date Posted: 22 Jul 2018 at 11:48am
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Lots of things can affect you he compression readings: Altitude; Ring wear; Timing; Valve lash; Design of the pressure guage; Cranking speed. If every cylinder is the same, I wouldn’t overthink it. You could also squirt a little oil in each cylinder and see if it goes up any. |
Posted By: DougS
Date Posted: 22 Jul 2018 at 12:23pm
Good power is the key here. What does it do for heavy work? As stated above, squirt some oil into one of the cylinders while all plugs are removed and the throttle is wide open. Check the valve lash too. |
HoughMade wrote:Posted By: LouSWPA
Date Posted: 22 Jul 2018 at 1:25pm
That's what I was looking for. I knew a 'low octane' would be lower compression ratio. therefor lower compression readings, I just didn't know how low. I do suspect the readings I am getting are not accurate, but this is more an exercise in curiosity because as I said, the tractor readily starts and runs fine. As for power, I really don't know because this is my lift tractor, I only use it for picking stuff up, so as long as it can get itself around and run the hydraulics it passes muster ------------- I am still confident of this; I will see the goodness of the Lord in the land of the living. Wait for the Lord; be strong and take heart and wait for the Lord. Ps 27 |