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Is All-fuel Manifold Different From Gas?

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TMAC

06-12-2002 10:39:39




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My I&T manual for JD50-70 states that the head must be removed when removing an all-fuel manifold because it is held on with studs. Does this mean an all-fuel head must be mated to an all-fuel manifold? My all-fuel manifold looks to be in good condition but if I ever need to replace it with a gas version will I also need to replace the head?




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Nathan(GA)

06-12-2002 13:57:19




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 Re: Is All-fuel Manifold Different From Gas? in reply to TMAC, 06-12-2002 10:39:39  
For what it's worth, I removed the all fuel manifold on my 620 without removing the head or much else.



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G-MAN

06-12-2002 12:03:09




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 Re: Is All-fuel Manifold Different From Gas? in reply to TMAC, 06-12-2002 10:39:39  
TMAC, there is a difference in the 50-70 all-fuel and gas manifolds. I believe all the gas tractors had duplex carburetion with individual intake ports for each cylinder, while the early all-fuel tractors maintained the single-barrel carb and intake passage. I believe the later all-fuel tractors used the duplex carburetion. The gas manifold is a two-piece affair with the intake and exhaust sections separated, while the all-fuel manifolds were one piece units. The duplex carbureted all-fuel serial number breaks are as follows: 50 - serial #5015951, 60 - serial #6013900, and it appears that all the 70 all-fuels were duplex carbureted, according to my parts source. I think the duplex cylinder heads are the same, regardless of them being all-fuel or gasoline, so it will depend on the age of your tractor if you have to change the head or not. My info probably isn't perfect here, as I looked this up pretty fast, but it should give you an idea.

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