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LouSWPA 
Orange Level Access
Joined: 11 Sep 2009
Location: Clinton, Pa
Points: 25073
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 Topic: compression WD
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
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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
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Albert
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Joined: 11 Sep 2009
Location: NW MO
Points: 410
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Posted: 21 Jul 2018 at 9:21pm |
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Take out all four plugs shut off fuel and open throttle wide open and retest again.
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LouSWPA
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Joined: 11 Sep 2009
Location: Clinton, Pa
Points: 25073
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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
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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
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DSeries4
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Joined: 12 Sep 2009
Location: Ontario, Canada
Points: 7495
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Posted: 22 Jul 2018 at 10:17am |
That seems very low in my opinion. My scrap yard D17 gets 150 lbs.
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'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
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HoughMade
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Joined: 22 Sep 2017
Location: Valparaiso, IN
Points: 707
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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.
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1951 B
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TramwayGuy
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Joined: 19 Jan 2010
Location: Northern NY
Points: 11742
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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.
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DougS
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Joined: 03 Nov 2011
Location: Iowa
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Posted: 22 Jul 2018 at 12:23pm |
 HoughMade wrote:
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. |
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.
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LouSWPA
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Joined: 11 Sep 2009
Location: Clinton, Pa
Points: 25073
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Posted: 22 Jul 2018 at 1:25pm |
HoughMade wrote:
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. |
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
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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
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