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hpal
 Post subject: Valve stem seals/o-rings
PostPosted: Sat Jan 13, 2018 12:29 pm 
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Rebuilding the 202 head and have put new valve guides in with a groove to take conventional valve stem seals. What do the small o-rings which came in my gasket set do? Do I need them when I run the other seals? Thanks

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hpal
PostPosted: Sat Jan 13, 2018 12:38 pm 
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minimanic
PostPosted: Sat Jan 13, 2018 1:27 pm 
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The O ring seals don't get used when fitting the S type (on the right of pic).
You can chuck the o rings if you want, they don't work very well, the S type is the way to go.
Always check the caps don't hit them if you are using long collet valves and high lift cam.

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Scoop
PostPosted: Sat Jan 13, 2018 1:44 pm 
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And also make sure the groove fits the seal. I have had to machine off part of the guide to allow the seal to fit before.

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peterb
PostPosted: Sun Jan 14, 2018 6:33 am 
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Don't the O rings only fit early mini's with the long collet groove?
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drmini in aust
PostPosted: Sun Jan 14, 2018 7:12 am 
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peterb wrote:
Don't the O rings only fit early mini's with the long collet groove?

Yes. I would fit them in, they help stabilize the early collets.
I have used the 1275 seals on plain smallbore guides by smearing some 262 Loctite on the guides.

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hpal
PostPosted: Sun Jan 14, 2018 7:56 am 
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Are the 1275 seals different?
Where exactly do the o-rings fit? cheers

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peterb
PostPosted: Sun Jan 14, 2018 9:10 am 
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You fit them in collet....sort of.
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winabbey
PostPosted: Sun Jan 14, 2018 9:38 am 
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peterb wrote:
You fit them in collet....sort of.

Part 19 in this exploded diagram of a 998 head.

Attachment:
PUB1011 AB06-1 L.jpg

Attachment:
PUB1011 AB06-1 R.jpg


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drmini in aust
PostPosted: Sun Jan 14, 2018 10:31 am 
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You fit the O ring into the valve stem groove when spring is compressed, then fit both collets on top of it.
Only used on early valves with the wide collet groove.

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hpal
PostPosted: Sun Jan 14, 2018 10:53 am 
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Thanks guys

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hpal
PostPosted: Sat Jan 27, 2018 1:39 pm 
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Copper side up?


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drmini in aust
PostPosted: Sat Jan 27, 2018 4:53 pm 
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Generally yes.
Copper gaskets aren't as good as in the old days, if you get water leakage fit a BK450 composition one instead.

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hpal
PostPosted: Sat Jan 27, 2018 6:40 pm 
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thanks mate, I have another gasket (looks like a black and silver one) perhaps I should just fit that?

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drmini in aust
PostPosted: Sat Jan 27, 2018 6:49 pm 
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Try it.

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