When we did an emergency head job out in the field we used to put the new valve in the new seat and hit it real hard with a brass hammer to seat it . Never had one come back .
Is he lapping or polishing?
Looks like an air pressure test for making sure the valve and seat don’t have any gaps.
Where I work there was a mechanic that take a brand new valve and use a weird grinding set up to change the pitch of the valve where it would hit the seat when they were rebuilding heads for large Ingersoll nat gas fired engines (16 inch pistons). Only person that did it and never got an explanation why he did it. Did not do anything to the seat.
Probably undercutting the valve face right under where it was sealing to increase flow.
When we did an emergency head job out in the field we used to put the new valve in the new seat and hit it real hard with a brass hammer to seat it . Never had one come back .
Is he lapping or polishing?
Looks like an air pressure test for making sure the valve and seat don’t have any gaps.
Where I work there was a mechanic that take a brand new valve and use a weird grinding set up to change the pitch of the valve where it would hit the seat when they were rebuilding heads for large Ingersoll nat gas fired engines (16 inch pistons). Only person that did it and never got an explanation why he did it. Did not do anything to the seat.
Probably undercutting the valve face right under where it was sealing to increase flow.
I bet his wife loves him in the bedroom. LOL