valve seals....again

MikeG

MikeG

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I'm getting ready to put new seals on my intake valves. The seals that Andover lists appear to be the standard viton seal with no choker springs. Kibblewhite's website shows 7 different types but again only one for the Norton, style 1.

Product Directories, Seals, Valve Guide | Kibblewhite Precision Machining, Inc

shop.kpmivalvetrain.com shop.kpmivalvetrain.com

I can't seem to find anything in style 4 with the same sizes as listed for the Commando. Its a stock 71 Commando built after they went to bronze guides according to serial number. Any suggestions?
 
I believe there is a GM application where aftermarket ones are available in style 4 that fit a Norton either directly or with a little work. You would need to do some measuring of the guide OD and room for height etc and do some digging.
 

Valve Guide Seal Mod (2016)

With reference to the recent posts on replacing valve guide seals. It is bloody annoying when a guide seal pops' off and it's still a pain changing one with the head in place. I've had an idea for a few years of how to prevent the seal from popping off but never needed to do anything about it...
www.accessnorton.com www.accessnorton.com

Valve Guide Seal Mod (2016)

With reference to the recent posts on replacing valve guide seals. It is bloody annoying when a guide seal pops' off and it's still a pain changing one with the head in place. I've had an idea for a few years of how to prevent the seal from popping off but never needed to do anything about it...
www.accessnorton.com www.accessnorton.com
 
Onder said:

Product Directories, Seals, Valve Guide, Norton®, 850 1973-1977 | Kibblewhite Precision Machining, Inc

shop.kpmivalvetrain.com shop.kpmivalvetrain.com

I have these. They seem fine. But then I am an untutored idiot.
Click to expand...

ditto, ditto and ditto

JS Motorsports stocks these banded versions, though I have no experience with them:

jsmotorsport.com

Four Banded, spring loaded Viton valve guide seals - install by hand.

These are the only available banded Viton guide seals for Nortons that press on by hand. Won’t dry up oil lubrication to the valve stems like Teflon seals can. The bands insure a tight seal top and…
jsmotorsport.com
 
I've had KW non-spring type, reddish orange colour, installed for past 8k miles and all fine on my 850. Originals just crumbled apart when replacing after oil puffs out the back.
 
Ordered a set of the non spring ones today. Thanks all for the replies.
 
Beware - not all viton seals are the same. The best ones are banded top and bottom. Most important is the relaxed ID measurement. They should not fall off a caliper at .287" If they fall off at .290" they are junk. I learned the hard way after building the 260 V8 small block ford in my Willys. It burned oil with brand new spring and banded seals that were too loose so I had to do the job all over again.

valve seals....again
 
I have purchased identical looking seals (except for color) from different manufactures with either tight or loose IDs. Both were designed for 5/16 stems and fit Nortons. The loose seals smoked.
 
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