How To Repair/replace A Burnt Valve On A 1996 Ford Ranger 3.0 Engine
Which cylinder and was it one with a faulty injector?
Burnt valve means a hot spot in the cylinder.
Running besides lean causes hot spots, so a faulty injector could do that.
Blocked cooling passage well-nigh that valve can crusade a hot spot, hot tanking head volition usually clean it out but could be a casting flaw if head is low miles, nether 100k, probably not on an '86 
The exhaust valve runs at a higher temp than the intake because intake is cooled by incoming fuel/air, and so frazzle valve is most likely to get burnt simply they are also made of stronger compounds.
The valve seat for each exhaust valve is very of import, the valve seat is cooled by the coolant, the frazzle valve is then cooled past its contact with the seat, 75% of valve cooling is done past contact with the seat, if the valve and seat are not matched then full contact isn't possible, and so full cooling isn't possible.
Valve defects are know problems, 1 replacement valve manufacturer, claimed i on 5 OEM valves could be defective, not sure it would exist that high, lol, but I know information technology does happen.
Best thing you tin can do is to check all possible external reasons for that ane valve to fail and if nothing can be found then "defective valve" is what you are left with.
I would check with a few local auto shops and get pricing on valve chore + cleaning and surfacing, they can check and reseat valves not replace them all, although replacing all the exhaust valves might exist a adept idea.
Source: https://www.therangerstation.com/forums/index.php?threads/burnt-valve.138140/
Posted by: forbescousitony.blogspot.com
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