crane operator
Senior Member
Early 80's big cam. Truck won't shut off with the key, manual screw works. So I replaced the solenoid, and if you have the manual shut off screw in juuusssttt the right spot, it will shut off with the key. Sometimes.
So I'm thinking I've either got a electrical issue not giving enough voltage to the solenoid- but if I screw the manual shut off it pushes it to "almost closed" and then it works. Or- I've got problems inside the shut off valve, and its got gunk on the spool, or the spool portion is leaking?
I've never been inside the shut off of a big cam, but I'm thinking my first/next is to get a good 12v coming to the shut off solenoid, and see if that changes things. If not I guess I'll have to dive into the shut off valve itself.
So I'm thinking I've either got a electrical issue not giving enough voltage to the solenoid- but if I screw the manual shut off it pushes it to "almost closed" and then it works. Or- I've got problems inside the shut off valve, and its got gunk on the spool, or the spool portion is leaking?
I've never been inside the shut off of a big cam, but I'm thinking my first/next is to get a good 12v coming to the shut off solenoid, and see if that changes things. If not I guess I'll have to dive into the shut off valve itself.