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| Valve stem seals/o-rings https://ausmini.com/forums/viewtopic.php?f=2&t=96620 |
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| Author: | hpal [ Sat Jan 13, 2018 12:29 pm ] |
| Post subject: | Valve stem seals/o-rings |
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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| Author: | hpal [ Sat Jan 13, 2018 12:38 pm ] |
| Post subject: | Re: Valve stem seals/o-rings |
Photo |
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| Author: | minimanic [ Sat Jan 13, 2018 1:27 pm ] |
| Post subject: | Re: Valve stem seals/o-rings |
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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| Author: | Scoop [ Sat Jan 13, 2018 1:44 pm ] |
| Post subject: | Re: Valve stem seals/o-rings |
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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| Author: | peterb [ Sun Jan 14, 2018 6:33 am ] |
| Post subject: | Re: Valve stem seals/o-rings |
Don't the O rings only fit early mini's with the long collet groove? |
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| Author: | drmini in aust [ Sun Jan 14, 2018 7:12 am ] |
| Post subject: | Re: Valve stem seals/o-rings |
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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| Author: | hpal [ Sun Jan 14, 2018 7:56 am ] |
| Post subject: | Re: Valve stem seals/o-rings |
Are the 1275 seals different? Where exactly do the o-rings fit? cheers |
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| Author: | peterb [ Sun Jan 14, 2018 9:10 am ] |
| Post subject: | Re: Valve stem seals/o-rings |
You fit them in collet....sort of. |
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| Author: | winabbey [ Sun Jan 14, 2018 9:38 am ] |
| Post subject: | Re: Valve stem seals/o-rings |
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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| Author: | drmini in aust [ Sun Jan 14, 2018 10:31 am ] |
| Post subject: | Re: Valve stem seals/o-rings |
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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| Author: | hpal [ Sun Jan 14, 2018 10:53 am ] |
| Post subject: | Re: Valve stem seals/o-rings |
Thanks guys |
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| Author: | hpal [ Sat Jan 27, 2018 1:39 pm ] |
| Post subject: | Re: Valve stem seals/o-rings |
Copper side up? |
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| Author: | drmini in aust [ Sat Jan 27, 2018 4:53 pm ] |
| Post subject: | Re: Valve stem seals/o-rings |
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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| Author: | hpal [ Sat Jan 27, 2018 6:40 pm ] |
| Post subject: | Re: Valve stem seals/o-rings |
thanks mate, I have another gasket (looks like a black and silver one) perhaps I should just fit that? |
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| Author: | drmini in aust [ Sat Jan 27, 2018 6:49 pm ] |
| Post subject: | Re: Valve stem seals/o-rings |
Try it. |
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