Valve stem seals hb sl 90

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Valve stem seals hb sl 90

Postby Martin » Sat Jun 06, 2020 2:05 pm

Can anyone help please . After taking engine out to change sump gasket I found rubber pieces in the sump which have come from the valve stem seals fitted to my engine. After taking the head off and removing the 1st two valves it seems these seals are incorrect and have been forced down over the valve guide. The seals are on all valves ,I ordered a new set of supposed correct seals but they are much too small. Can anyone help with some information about if there should even be seals because I’ve been told they may only be on inlets anyway many thanks
Martin
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Re: Valve stem seals hb sl 90

Postby hbr341 » Sat Jun 06, 2020 4:08 pm

Hi Martin
The seals should just be on the inlet valves they normally come with the headgasket kit.

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Re: Valve stem seals hb sl 90

Postby Martin » Sat Jun 06, 2020 5:48 pm

Thanks I was told inlet valves only but the ones in the head set only fit over the valve stem so they would move up and down with the valve they are not wide enough at the base to go over the guide
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Re: Valve stem seals hb sl 90

Postby hbr341 » Sun Jun 07, 2020 5:28 pm

Hi Martin
Some of the new gasket sets are not very good someone must have some of those seals kicking around have you tried the wanted section on here yet .I fitted a new gasket kit onto my OHV engine recently when I rebuilt the engine and the rear crank seal is leaking nightmare as it will be engine out again to sort it that was a new kit.

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Re: Valve stem seals hb sl 90

Postby ADRIAN » Sat Jun 13, 2020 4:41 pm

Remember that the early HB 1159cc engines did not have valve stem seals, and they cannot be fitted retrospectively. By early, I mean with 3/8th head bolts. Only heads with 7/16th head bolts have shoulders on the valve stems to fit seals. Perhaps yours is early 3/8ths and someone has fitted seals on the head incorrectly?
When you buy a head gasket set, 3/8th head sets do not have the 4 seals included in the packet, where 7/16th head gaskets sets do have them.
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Re: Valve stem seals hb sl 90

Postby rizzo » Sat Jun 13, 2020 7:45 pm

I seem to remember the early minis used to have just an O ring, cant really see it did alot but every little helps :D
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