3020 PROPANE ENGINE

[LBS]

The gas and propane engine both have 4.25 X 4 displacement for 227 cu in. However, the gas engine has a 7.5 compression ratio and the propane engine has a 9.0 ratio. The engines use different pistons, but can anyone tell me if there is anything else that is different. Are the blocks and heads the same?

When overhauling a propane tractor I found what I believe are gas pistons in what is probably a gas engine. With new propane pistons installed there is interference between the piston and the head.

All recommendations on how to proceed would be appreciated.

 

[David G]

I would use the propane pistons if they fit, the 9.0 will really light the tractor up.

 

[buickanddeere]

The free parts book on the JD web site shows the differences . The service manual from 1-800-522-7448.

 

[DONMYEIL]

That's how the high compression was achieved . The block and head are the same as a gas engine . The manifolds are different unless this is not a factory LP .The head gasket will hold the head clearance , unless you are putting something non DEERE in . Lay a straight edge across the piston and sleeve. Any chance you have high altitude pistons ?, they fit right up there . I wonder if this is a gas conversion when you say it has gas pistons . Did you check the pistons for part nos. ?

 

[Kent Petersen]

I Think some body milled the head the get more compression you need the mike it and compare to factory specs.

 

[LBS]

Thank you everyone for your ideas. Not sure what I'll do yet, but some day I'll let you know what was tried and how it worked out. When buying a used tractor you never know what has been installed to make it work.