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WD 45 compression

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11-17-1999 10:08:45

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I have just done a compression test on a unrestored WD45. The compression is about 95lbs on each of the four cylinders. The tractor seems to not have the same power that it use to have and it leaks alot of oil. Otherwise it is in very good condition. What is the proper compression on this tractor, and if I need a rebuld kit who makes a good one?

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Phil Auten

11-17-1999 11:58:19

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 Re: WD 45 compression in reply to waffle, 11-17-1999 10:08:45  
95 PSI is a little low, probably should be a bit closer to 100-105 PSI per cylinder. Try squirting about 2 Tablespoons of oil in each cylinder and repeat the test. If the pressure rises more than 5 PSI suspect rings. If the pressure doesen't change suspect valves. You may only need to have a valve job done to restore the lost power.

Good luck,

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11-17-1999 11:24:33

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 Re: WD 45 compression in reply to waffle, 11-17-1999 10:08:45  
I'm not sure of the right compression numbers, but for a kit, you are hard pressed to beat the AGCO kit. I got one for my WC and while I don't have it together yet, if somethign is wrong in the kit, good luck getting a mail order palce to help. Dealers have shops that can and will offer free advice, especially if you buy over their counter.

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Brian G

11-18-1999 06:55:51

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 Re: Re: WD 45 compression in reply to Aaron, 11-17-1999 11:24:33  
Some engine mfgs. say the difference between the readings on the lowest and highest cylinders should not be more than 10%, others say the difference should be no more than 10-15 lbs. Most of the A-C tractor manuals don't list the Compression pressure, The WD-45 Manual states: "Compression Pressure: 125# @ 500 RPM". Follow Phil's advice for determining if the problem is valves or rings. I would guess the rings are worn since all cylinders read uniformly low. Brian G.

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