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Valve Seat Question

I'm getting a compressor by this weekend to get these changed. However, a couple of days ago, when I was trying to change the seals, I noticed the old ones were riding up on the valve stem. I'm curious what would cause them to ride up like that. Did they shrink or expand? Is that a common occurrence and also, I noticed the new ones don't have a means to "hold" or "tie" them down. What is the theory behind how the valve seals seat themselves properly and then remain in the proper position thereafter?

Thanks in advance,

Bill

Reply to
William Oliveri
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Reply to
L.W.(ßill)

All of mine are the same size. They are Fel-Pro Premium Quality NYLON the box says.

So the "umbrella" effect is that at the down position of the valve the seal rests on the head and at the up position the seal has enough depth or length to shield oil from getting in. Is that how it works?

When I looked at mine it seemed they were about half way up the stem. When I checked my plugs it looked like almost every one had a wet look around the base of the threaded part of the plug. Someone else mentioned that if an engine overheats it will ruin the valve seals. What happens to them that makes them not function properly any more? Does the heat cause them to shrink thus loosing the umbrella effect?

Thanks,

Bill

Reply to
William Oliveri

All the ones I have seen stayed in place on the head.

They are flexible enough to grab onto the rim at the head and the valve just slides up and down through them.

Heat causes them to go hard so they don't grab or seal to the valve stem any more.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

William Oliveri wrote:

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Mike Romain

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Steve G

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