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John Deere Tractors Discussion Forum

two cylinder compression

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Keith

06-19-2004 03:18:01

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How much compression should each cylinder have on a john deere B 1946?

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Russ

06-19-2004 17:30:02

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Re: two cylinder compression in reply to Keith, 06-19-2004 03:18:01

1946 JD B: 174.9CID,COMP. RATIO 4.7:1 x 14.7 PSI/ATM EQUALS 69 PSI FOR EACH CYLINDER ON THIS OLD WILDA BEAST. NOT SURE WERE ONE OTHER FIGURE OF 110 PSI IS DERIVED FROM. IF THIS OLD BIRD IS WITHIN 5 PSI COMPARING CYLINDERS AND CAN TUG A SINGLE BOTTOM PLOW ALL DAY YOU HAVE CHOSEN WELL.

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buickanddeere

06-20-2004 11:38:16

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Re: Re: two cylinder compression in reply to Russ , 06-19-2004 17:30:02

If there was no cam overlap, cylinderwall/piston or valve leakage and no pressure increase due to heating during compression ( Universal Gas Law) then 14.7 psi at sea level times mechanical compression ratio would work. 88psi when cranked with the starter/throttle and choke wide open and the other spark plug removed would be ideal.

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keith

06-20-2004 06:48:42

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Re: Re: two cylinder compression in reply to Russ , 06-19-2004 17:30:02

Thanks for the help

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HINKLE

10-11-2004 20:07:07

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Re: Re: Re: two cylinder compression in reply to keith, 06-20-2004 06:48:42

I AM WORKING ON A JOHN DEERE H AND HAVE BEEN HAVING TROUBLE GETTING IT TO START CONSISTANTLY AT AN IDLE IT RUNS ONLY ON THE LEFT CYLINDER IS THIS COMMON? ALSO WHAT IS A GOOD COMPRESSION READING FOR THIS ENGINE.

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John T

06-19-2004 16:50:26

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Re: two cylinder compression in reply to Keith, 06-19-2004 03:18:01

Keith, the good gentlemen below have given you specifications you requested, so I will only add that as far as reasonable performance is concerned and if youre gonna use the tractor for light duty, the fact that BOTH cylinders are fairly close in compression is almost as important as that they be in like new condition. If you have the cylinder where both valves are closed and use a spark plug hole adapter to pressurize the cylinders using an air compressor, you can listen and observe if shes a bad leaker out the exhaust (exh valve) or carb (intake valve) or crankcase (rings). It also makes a difference in reading the compression dry versus wet with the rings well oiled. If she dont start well and has low dry compression but if you squirt some oil in the cylinders via the plug holes and then the compression picks up and she starts better, that can mean worn rings. Also, if she has excess crankcase blow by or throws a lot of blue smoke out the stack, you can again have worn or stuck rings and possibly excess valve guide wear. If the rings are stuck and carboned up causing lower compression, Ive had some luck changing the oil and adding Rislone and auto tranny fluid and a good light weight high detergent oil and running her hot n hard which may clean and free things up.

Best wishes n God Bless

John T

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keith

06-20-2004 06:51:15

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Re: Re: two cylinder compression in reply to John T, 06-19-2004 16:50:26

thanks for the help
and God Bless

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Earl S

06-19-2004 14:48:45

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Re: two cylinder compression in reply to Keith, 06-19-2004 03:18:01

All fuel is 70 PSI. (201000 and up) serial # Gasoline is 110 PSI.Earl In Illinois

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keith

06-20-2004 06:52:59

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Re: Re: two cylinder compression in reply to Earl S, 06-19-2004 14:48:45

thanks for the help

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BUTCH ( PA )

06-19-2004 10:42:35

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Re: two cylinder compression in reply to Keith, 06-19-2004 03:18:01

KEITH,
ACCORDING TO MY SHOP MANUAL THE COMPRESSION RATIO FOR THE "B" ALL FUEL IS 4.71:1
FOR THE GAS IS 5.87:1
HOPE THIS HELPS

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keith

06-20-2004 06:53:49

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Re: Re: two cylinder compression in reply to BUTCH ( PA ), 06-19-2004 10:42:35

thanks for the help

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