How to rebuild an air relay

[@jeffrobbins9931]

Fred: You are not A Diesel mechanic you are a Diesel surgeon !

[@shadowbanned69]

Nice job Fred...I used to work at a marine shop and would get parts like raw water strainers or solenoid housings and damaged filter housings(bronze) and SS. But marine parts have some nassssty residue and man does it stink sometimes...I feel your pain...

[@epicfred]

That was 20 years of rust, water and neglect. I was surprised how good of shape everything was in. Now I think I have to get a new solenoid, it still doesn't want top open up all they way initially.

[@haysen8904]

Hellow How do i know it is not working properly? My D399 is not starting its an air starter

[@epicfred]

1-Make sure the main air valve is open. 2-Maks sure the starter isn't stuck, there are no broken vanes in it, broken bearings etc. Rotate it by hand to check. 2- check if the air solenoid is functioning. Disconnect the air output line from it and see if air comes out when you manually accurate it. 3- reconnect the line from the air solenoid and accurate it by hand to see if the starter runs. If the starter runs when you accurate the solenoid by hand then you have an electrical issue, a pre lube lockout or something like that. If the starter does not run when you accurate the solenoid then you have an issue with the air relay. You can bypass it with a 1 1/2 inch ball valve if you need to start the engine in a pinch.

[@haysen8904]

Thanks for your time i did replace the valve, i had one spare and the engine ran rigth away