where to get 8MM valve stem seals
#2418629
12/14/17 07:55 PM
12/14/17 07:55 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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std black neoprene ones, that will fit inside some narrow inner springs. thank you for your time.
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Re: where to get 8MM valve stem seals
[Re: Cab_Burge]
#2419816
12/17/17 12:57 PM
12/17/17 12:57 PM
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Posts: 36,041 Lincoln Nebraska
RapidRobert
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Cab I see a "2 ring rubber" and a "teflon" & a "teflon & rubber" on page 39 & the listing says a machining tool is needed for all of the three. I'd like to avoid another trip to the machinist if possible. EDIT Oh is that tool just to get the OD correct for the seal & it will stay put? The tool does not machine any special grooves or something trick to grab the seal & keep it in place? If so, the guide nub OD might be OK as is.
Last edited by RapidRobert; 12/17/17 01:07 PM.
live every 24 hour block of time like it's your last day on earth
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Re: where to get 8MM valve stem seals
[Re: RapidRobert]
#2419922
12/17/17 05:20 PM
12/17/17 05:20 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
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The “common” two sizes for the guide OD when using aftermarket seals are .500 or .530.
If your guide tops are not either of those sizes I think you’ll have a hard time finding seals.
The “tool” can be used in a hand drill.
You’ll need the appropriate pilot as well.
5/16 and 8mm are only a few thou apart, so 5/16 seals will work fine.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: where to get 8MM valve stem seals
[Re: fast68plymouth]
#2420016
12/17/17 09:03 PM
12/17/17 09:03 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Thanks Dwayne, let me go measure some more on what I got.
live every 24 hour block of time like it's your last day on earth
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Re: where to get 8MM valve stem seals
[Re: RapidRobert]
#2420314
12/18/17 01:56 PM
12/18/17 01:56 PM
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Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
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master
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Syracuse,NY
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Like Dwyane said, 5/16 will be fine on 8mm. if you totally run out of options, you can grab some from AFR, as mostly everything they do is 8mm.
RIP Monte Smith
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WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: where to get 8MM valve stem seals
[Re: RapidRobert]
#2420410
12/18/17 04:50 PM
12/18/17 04:50 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
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You need to tell use one thing: What is the largest OD of valve stem seal you can tolerate?
Then you get the ID of the sleeve part of the seal. If you are lucky your guide OD will be 0.500 or 0.530 and you can use stock Magnum motor seals.
If you need to machine the valve guides so the valve stem seals will fit on, you can do it yourself. You need an electric drill, valve guide cutter and pilot.
Attach the pilot to the cutter, chuck the cutter into the drill, lube the pilot and cut down the valve guide. It's that simple. On my '86 318 the valve guide was 0.625, and the stem seals were for 0.625. But the guides stuck up too high if my valve lift exceeded 0.474". So I bought the same cutter and a 3/8" pilot and 15 minutes later I had all my guides OD sized and made cylindrical, and the guides about 0.2" shorter.
One tip: The cutters in the tools are carbide and don't take kindly to shock. I was careless and now I get to hand finish the tops of the guides I cut down.
Total cost less than $100.
Study carefully before you buy. There are cutters for valve seats, cutters for valve guide OD, and cutters for valve guide height. Generally they are two out of the three, for example spring seat and valve guide OD, or valve guide OD and height.
R.
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Re: where to get 8MM valve stem seals
[Re: dogdays]
#2420413
12/18/17 05:00 PM
12/18/17 05:00 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Good info Dog, I will get out there & measure & there's an inner spring that will be in there after breakin so yes dimentions will be critical. EDIT the inner spring ID is .690" and the metal nub OD is .534"
Last edited by RapidRobert; 12/18/17 06:25 PM.
live every 24 hour block of time like it's your last day on earth
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