Author Topic: Valve stem seals  (Read 2984 times)

Offline bushy123

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Valve stem seals
« on: 14 October 2012, 18:47 »
Hay guys this is my first post on hear, I bought my little 8v gti a few months back now and have only just had chance to drive it due to stupidly braking my back the day I got it, but that's a story for another day!
So back to the point I took her for a spin yesterday and got the standard belch of white smoke kicking out the back when giving it the beans on the A3, so got home and did a quick compression test, reading came back all fine, so I'm 99% sure it the valve steam sills? Any other views would be awesome.
So just to get it straight the smoke starts when your putting the hammer down and let off for a second ( normally to let some plonker with no mirrors or indicators cut you up) the put me foot down again and a massive cough of white smoke, let of again and it stops!!! Also I noticed some oil ha spurted out of the breather bit on the rocker cover????
Any help would be awesome also is there anywhere local to Guildford that would be able to fix it if that is the case? Thanks again Tom (bushy123)
« Last Edit: 14 October 2012, 19:25 by Lewy »

Offline tshirt2k

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Re: Valve stem sills
« Reply #1 on: 14 October 2012, 19:24 »
Sounds more like rings to me. Not valve stem seals.

Stem seals usually leak slower and give blue smoke.


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Offline bushy123

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Re: Valve stem seals
« Reply #2 on: 14 October 2012, 19:33 »
Happy days thanks dude, wouldn't that reflect in poor compression in the compression test? Also any ideas on cost if it is the rings? Thanks again

Offline tshirt2k

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Re: Valve stem seals
« Reply #3 on: 14 October 2012, 19:53 »
Depends. There are different rings.


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Offline Gambit

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Re: Valve stem seals
« Reply #4 on: 14 October 2012, 21:05 »
How many miles are on it? And what oil is in it?

Offline bushy123

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Re: Valve stem seals
« Reply #5 on: 14 October 2012, 22:06 »
58k genuine with all the paper work to prove it, but no idea about the oil??? Do you think I should drop it out and change filter? If so what oil should I be using and are there any tricks of the trade I should know with the oil change? Thanks for your input.

Offline Jimmyrallye

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Re: Valve stem seals
« Reply #6 on: 14 October 2012, 22:18 »
Give the car a good service some decent oil .. Mine used to smoke heavy on start up then clear but as said if you giveing it beans then smoke does sound like worn rings .. Does it use any oil ?

Offline tshirt2k

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Re: Valve stem seals
« Reply #7 on: 14 October 2012, 22:20 »
Proof that a low mileage car isn't necessarily the best choice.


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Offline Gambit

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Re: Valve stem seals
« Reply #8 on: 14 October 2012, 22:26 »
Drop the oil and stick a 10w40 semi synthetic oil plus genuine or bosch oil filter. When refilling dont fill to full mark, run it at halfway. Clean the breathers out also. And then see how it goes, it could also just have had a very easy life and be coked up. Couple of good scalps after the oil change will help clear it

what was the compression you were seeing?

Offline bushy123

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Re: Valve stem seals
« Reply #9 on: 14 October 2012, 22:43 »
Awesome thanks guys not to sure if its using a grate deal of oil as I've only driven it about 25 miles so far, guess it must be using some as the smell is defo that horrible burning oil smell! It will have to wate till next week now due work :angry:! Compression was running (12.7 - 12.7- 12.6 - 12.7) so only the 3rd chamber was running slightly low??? Or at least I think 12 is good as I'm a 2-stroke engineer and if a chain saw was running that kind of compression you would sure know it when you tried to start the bugger! Any ideas on what compression it should be running???