valve stem oil seal

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andy007
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valve stem oil seal

Post by andy007 » Mon May 11, 2015 11:33 am

Hi.
i have a bit of smoke from the exhaust and someone said try and change the valve stem oil seals, is this a hard job to diy?
I have done quite a bit on cars, but not had the head off, if it has to come off?
Also do you need special tools?
:?:



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Re: valve stem oil seal

Post by philhoward » Mon May 11, 2015 11:35 am

Welcome, Andy!

Which car? I'm guessing an Small Sports as you mention "head" singular. If it's a CVH then you can get a tool to do for about a tenner.


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Re: valve stem oil seal

Post by andy007 » Mon May 11, 2015 11:37 am

it is the ford v6



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Re: valve stem oil seal

Post by peter freeman » Mon May 11, 2015 11:44 am

Stem seal failure is normally seen a) by a bit of smoke when you first start the engine and b) when it is left idling for a while. Getting past the piston rings is normally when going down a hill you use the engine for braking and then it smokes when you accelerate. Quite often the stems seals fail on the near side first - possibly No6 cyl. You can change the seals without taking the heads off if you have a tool for the job or make a tool for the job - a simple bar to lever the springs down works well. Beware that there are oil drain holes in the head which you must cover because if you drop a collet down them and you don't have spares then ithe sump has to come off to get them back



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Re: valve stem oil seal

Post by philhoward » Mon May 11, 2015 11:45 am

Which model - and is it from both exhausts? Is it only at idle, or under load, trailing throttle..?


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Re: valve stem oil seal

Post by andy007 » Mon May 11, 2015 12:02 pm

mainly on idle, but a little when pulling off, going a constant speed it doesn't seem so bad, I done a compression test on all cylinders, most were 130 - 125 psi, one was down to 115driver side near bulkhead, no idea what nuber?



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Re: valve stem oil seal

Post by andy007 » Mon May 11, 2015 12:03 pm

I fitted the repair kit to the carb, put large jets in, seems a lot better, so it's not the carb end.



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Re: valve stem oil seal

Post by peter freeman » Mon May 11, 2015 12:05 pm

Near the bulkhead drivers side is No3



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Re: valve stem oil seal

Post by philhoward » Mon May 11, 2015 12:26 pm

Do the compressions get any better if you try a squirt oil oil down the plug hole before running the compression test? They sound a bit low.


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Re: valve stem oil seal

Post by andy007 » Mon May 11, 2015 12:37 pm

i didn't try that, wd40? or engine oil?



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Re: valve stem oil seal

Post by philhoward » Mon May 11, 2015 12:39 pm

Engine oil. The theory is if there is some bore wear, it provides a temporary seal so you get a slightly improved compression figure.


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Re: valve stem oil seal

Post by andy007 » Mon May 11, 2015 12:53 pm

ok, I will try that in the next day or two and come back with results, how much oil? about a table spoon or bigger? Then before I start it again, should I just turn it over without the ht leads on just to get it out of the exhaust? or just let it fire up?



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Re: valve stem oil seal

Post by philhoward » Mon May 11, 2015 1:00 pm

If you have an oil can, then one squirt ;) A teaspoon will be more than enough, in fact possibly a bit too much.

I'd spin it over for a second or two before refitting the plug (and a cloth over the hole) just to blow any oil that's left in there. Just don't be surprised when you get a cloud when you start it again ;)


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Re: valve stem oil seal

Post by andy007 » Mon May 11, 2015 1:07 pm

will let you know then, thanks



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Re: valve stem oil seal

Post by andy007 » Wed May 27, 2015 10:32 am

Still haven't done it, but before I do, would better oil help? What is the best oil?



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