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  #1  
Old 07-23-2021, 04:52 AM
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stonybrookpictures stonybrookpictures is offline
232 I6
 
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Location: ri
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Valve Stem Seal question.

79 Wagoneer, 401.
I believe I have leaking Valve Stem Seal on #8 Cylinder.
If the Head has Positive seals, which I read require some machining of the stem, can I switch to Umbrella type? Once I have the old seals out I will post a photo. Blue smoke and badly fouled plug on #8 ( Passenger side rear)
Good compression across all cylinders. 150Psi cold engine, 8 cranks, all plugs removed.
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  #2  
Old 07-23-2021, 06:39 AM
wiley-moeracing wiley-moeracing is offline
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sure, but why?
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  #3  
Old 07-24-2021, 06:04 AM
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stonybrookpictures stonybrookpictures is offline
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Turns out I have umbrella style

They look like Enginetech Premium. The spring at the top threw me off
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Old 07-24-2021, 07:03 AM
wiley-moeracing wiley-moeracing is offline
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replace with the same.
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  #5  
Old 07-25-2021, 06:45 AM
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stonybrookpictures stonybrookpictures is offline
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Hard to find.
Quote:
Originally Posted by wiley-moeracing
replace with the same.
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  #6  
Old 07-25-2021, 07:23 AM
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stonybrookpictures stonybrookpictures is offline
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Enginetech Part #

Catalog says Part# S288-20 ( 20 pack )
Cant seem tp find a source on-line
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  #7  
Old 07-25-2021, 11:02 AM
wiley-moeracing wiley-moeracing is offline
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Everything is hard to find right now, check your local engine machine shop and or napa.
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  #8  
Old 07-25-2021, 12:07 PM
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BINGO

https://proenginerebuilders.com/
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  #9  
Old 07-25-2021, 12:09 PM
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rang-a-stang rang-a-stang is offline
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The positive seals are MUCH better and last A lot longer. Also, when they fail, they do not send big chunks of rubber through your engine.

Search for Viton seals and you will find sets all over ebay and other sites for less than $50. Ask any local machine shop and they should have them on the shelf too.
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  #10  
Old 07-26-2021, 12:12 PM
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letank letank is offline
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Join Date: Jun 03, 2002
Location: San Francisco
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here we go:

http://www.ifsja.org/forums/vb/showthread.php?t=187035

the short version

Enginetech S2886 look like what the engine builder used on my engine.
Regardless, that's what I bought to replace the damaged one. Seems fine.

https://www.rockauto.com/en/moreinfo...27&jsn=7&jsn=7


last time (checked : it was 2013) I went to the local part outlet... and it was the white felpro


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74 wag, 349Kmiles on original ticker/trany, except for the rust. Will it make it to the next get together without a rebuilt? Status: needs a new body.
85 Gwag, 226 Kmiles. $250 FSJ test lab since 02, that refuses to give up but still leaks.

See Ouray 2013, Engine bits and Fuel and brake lines, and Body work

Last edited by letank : 07-26-2021 at 12:31 PM.
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  #11  
Old 08-07-2021, 01:37 AM
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FSJunkie FSJunkie is offline
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A leaking exhaust valve stem seal won't foul the spark plug. It'll smoke out the exhaust, but that's because the oil is burning in the hot exhaust. It's not actually burning in the cylinder.

Only the intake valve stem seal will burn oil in the cylinder.
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  #12  
Old 08-07-2021, 08:11 AM
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Curly5759 Curly5759 is offline
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This may be a bit late, but a bad vacuum modulator can cause the spark plug to foul. Quick and easy to fix.
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