This is a older tractor. My question relates to the fuel system. The older fuel injectors don't have any external seals? All of them seat and 3 don't leak but one does.

I was looking for a seal but it didn't have any not even on the tip. So I'm wondering if they have a torque spec or how does it use a pressurized fuel system with no o-rings or gasket?

For those interested in specific application type: motor casting number # D5NN6015H

This places it in 75'

MODEL #LA254(6)(G)(C)(last digit maybe) Production #8H22B Serial # c580840

enter image description here


What you are seeing is the use of fit type to form a positive seal. Older vehicles used harder materials (not to be mistaken for toughness or strength) for most parts. As a result it was possible to use an interference fit or a transition fit to form a seal. Attached is an image explaining this. Essentially, the fit is literally to tight for any fluid to flow through.

enter image description here

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.