13 replies to this topic

[Club man]

Hi, ive started stripping the head for my 1098 engine its a 12g202, I've looked in some of the other builds and topics but can't find a great deal other than how or should I replace ones fitted

What I was wondering is, should this head have them fitted at all it hasn't at the moment and there are no smoke issues, has somone neglected to fit these in the past?
I do have some with a spring collar and wondered if I should fit these as the valves go back in, they seem a bit of a stretch to fit over the guide

Sorry if its silly but it's my first engine

Thanks for reading

[Fast Ivan]

valves that are well lapped probably won't need them as they seal well. however, for the cost and effort I would fit them, they wont do any harm.

[absx2]

The valve stem seals are fitted on the inlet valve guides to help stop your engines oil from being drawn down the guide by the piston on its inlet stroke so it doesn`t matter how good your valves are lapped in, its about sealing the guide.
Use ljq101160 for a trouble free life and not the old "o" ring type. Rover minis had seals on all 8 stems but the inlets are the ones that matter.

[Club man]

Ok makes sense, would my head, had them fitted or am I retro fitting these?
The only groove I have is near the top for the collet to fit into, so can I still fit them?

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Edited by Club man, 06 December 2012 - 09:21 PM.

[Club man]

One without the spring

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[Club man]

Ahhh man i thought this stem had to have a groove, no my actual valve guides havent got a groove in

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And i have some of these already

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So that means my head never had these then, and i guess i can't unless i get new guides

But if I'm not smoking I'm fine without you all think?

Edited by Club man, 06 December 2012 - 10:11 PM.

[Guess-Works.com]

once you replace the guides you should also get the seats re-cut.

[Club man]

Right, understand now and take it new valves as well with new guides?

Thanks

[ACDodd]

This is one of the reasons that valve seat cutting is neccessary after guide changes, more prone to later heads;



The OE guides are not centred when machined, consequently changeing them for a new item will mean the seat will not be concentric with the valve. Result no seal. If anybody contemplates changing the guides without seat cutting they MUST CHECK THE SEAL using parrafin or similar after the work is complete.




about 80% of the heads I work on need seats cutting after guide work.

AC

Edited by ACDodd, 07 December 2012 - 11:03 AM.

[Club man]

Ok thanks, its still a leaded head so may make sense to get the valve seats done anyway

Thanks for helping me out everyone

Edited by Club man, 07 December 2012 - 11:05 AM.

[ACDodd]

To Answer the original question it is easy to retro fit the later cup type seal on the older guides. Simply cut off the lip at the bottom of the new seal and then superglue/loctite onto the guide.

AC

[ACDodd]

These are factory fit items!

AC

[Club man]

To Answer the original question it is easy to retro fit the later cup type seal on the older guides. Simply cut off the lip at the bottom of the new seal and then superglue/loctite onto the guide.

AC

Had a look today, when i said they look a bit stretched its those little lips on the bottom pushing them outwards because theres no groove for them to sit in, i might try this just to get it all back together, and have the head all done properly later

Thanks again guys

Edited by Club man, 07 December 2012 - 07:04 PM.

[Club man]

Righto, suppose if its worth doing its worth doing right, i did keep thinking about them comming off. Ive only got pound shop glue anyway