FloridaEdd wrote:
Stakeing the valve seat is ur best bet I think.
CO " Canadianoddysey " is the one who will have a,solution. Suprised he hasn't chimed in yet.
I haven't chimed in yet because I just got outa bed a couple hrs ago LOL. It's west coast time here.
Anyways with regards to this issue above I see no easy solution here.
There is no way that seat should have fallen out in the first place. It tells me there was a factory issue. Either the seat is under sized or the head is over sized.
The question is how much interference fit is required ?? We have two different metals here and the expansion rates will be different. So how much is needed in this instance ?? In most cases with similar metals the interference fit is .001-.003 and .004-.005 is considered excessive and .006-.008 is considered extreme.
In my opinion dimpling the head may work, but after the valve slaps the hell out of it for a bit, any hold that it had will be gone. You would need to measure the head and the valve seat to see what the difference is. The problem is getting at the head with the caliper to measure it. Not sure if you can get your caliper in that angle. This is not a back yard hack n whack job. If you get it wrong you can cause catastrophic damage to that Engine. That's my issue with dimpling the head.
Solutions: 1) You could dimple the head but no guarantee on that. 2) Get a machine shop to make a new seat with a correct amount of interference fit out of stainless. But how much is required ?? Probably be expensive unless you have your own lathe. 3) Get a new head
On a side note here I have to say that I have never done a valve seat -- on anything. So I may be talking out of my azz. Also the "mechanic" that worked on that
Engine with an impact gun and stripped a bunch of stuff, needs to be shot with his own poo. The problem is that we don't have or have very very few mechanics with a good skill set. The big companies don't want to train anyone and the younger people don't want to get dirty anymore. Why be a tradesman when you can be a truck driver and make the same money. No respect or compensation for real trades people anymore. There is no fn way a truck driver or machine operator should make as much money as a tradesman. Every trade guy I know has now said F it, if the boss opens his yap I'm gone. Also some of these "tradesmen" have dubious skill sets. I wouldn't hire them to fix my wheel barrow. It's bad out there.