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Bad valve seats on my 4.0l


black_demon69

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Had to pull heads due to bad exhaust valve seats:bawling:
Good news is that I should have heads back from the machine shop Friday. Hopefully it will be done Saturday :icon_thumby:
 


RonD

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Not common on the 4.0l
3.0l did have that issue for a few years

If they were burnt there may be an underlying issue that caused it, lean mix, pinging, rocker/valve stem issue

Exhaust Valves must turn/spin when opened and closed so they don't get "hot spots" which causes a leak and then burnt valve/seat
 

black_demon69

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valves were not burnt just sucked..

machine shop said that sucked valves are common on the 4.0l because he believes that original seats are to soft.
 

RonD

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Never read of that before

"Tulipped" intake valves I have read about on other engines, 2.3l lima for example, learn something new everyday :)
 

black_demon69

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On the 4.0l the original Valve seats are cast not inserted and as I said guy @machine shop speculates that they are soft. He says that he sees exhaust valves on 4.0l like that all the time. Intake valves seem to be fine.
 

black_demon69

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Manual
2WD / 4WD
4WD
BTW truck purrs like a kitten now. :yahoo::yahoo::headbang:
 

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