steve68steve
Active Member
Have an exhaust valve seat that won't clean up and has a small dimple in it.
I can't see a seam around the seat and partsfish.com doesn't list a valve seat in the diagram for the head, suggesting it's just machined into the head itself. Can anyone confirm this?
I'm concerned about how much material would have to get removed to clean it up.
Also, wondering if the valve is potato chipped. I don't have the means to check in my garage, but my thinking is that even if the valve is crap it's constrained by the valve guide - so as long as I'm lapping by rotating the valve 360degrees instead of just wiggling back and forth, a bad valve should still clean up the seat.
...in fact, that might be the way to check the valve itself: if the seat cleans up fully, but the valve only cleans up in small section, that means the valve cone is no longer concentric to the guide.
Looking for a sanity check.
It's a 2014 non-esa, if that matters.
I can't see a seam around the seat and partsfish.com doesn't list a valve seat in the diagram for the head, suggesting it's just machined into the head itself. Can anyone confirm this?
I'm concerned about how much material would have to get removed to clean it up.
Also, wondering if the valve is potato chipped. I don't have the means to check in my garage, but my thinking is that even if the valve is crap it's constrained by the valve guide - so as long as I'm lapping by rotating the valve 360degrees instead of just wiggling back and forth, a bad valve should still clean up the seat.
...in fact, that might be the way to check the valve itself: if the seat cleans up fully, but the valve only cleans up in small section, that means the valve cone is no longer concentric to the guide.
Looking for a sanity check.
It's a 2014 non-esa, if that matters.