Valve stem seals
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Mountain Pass
Joined: Oct 2002
Posts: 205
Likes: 0
From: Jaqcksonville
Valve stem seals
97 4.0 starting to puff some blue smoke after just moving off. I've replaced the pass head over time but still on the original drivers head. Has anyone changed the stem seals using compressed air with engine in the van drivers side only
Lead Driver
Joined: Sep 2003
Posts: 7,013
Likes: 205
From: SoCal
The trick is to install an air adapter in the spark plug hole and pressurize it to keep the springs from falling in. But you're right; you'd be hard pressed to get any valve spring compressors to fit in the engine compartment.
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
Faster and easier to pull the head. Also gives an opportunity to examine valves, valve seats and heads for any cracks and measure valve stems/valve guides for wear.
With the head off, good time to pull and examine roller lifters for wear or damage.
With the head off, good time to pull and examine roller lifters for wear or damage.
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