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Gtir Motorsport club » Tech room » Help and Advice » Valve stem seals

Valve stem seals

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1 Valve stem seals on 16th November 2014, 4:16 pm

PartyPete

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the one star club
the one star club
I think i need to change my valve stem seals as its using oil and smoking, any way, is there a link some where or video of how to do them on the pulsar? I want to do it with the head still on and the best way to do the timing etc! Any help or advise would be great. Cheers

2 Re: Valve stem seals on 16th November 2014, 4:27 pm

johnny gtir

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What makes you think its them over the turbo mate ?

3 Re: Valve stem seals on 16th November 2014, 5:17 pm

PartyPete

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the one star club
the one star club
It was smoking before I put this 3071 on which was like new with no play in the shaft, so I think its something else

4 Re: Valve stem seals on 16th November 2014, 6:51 pm

GTI-R US

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Management
Management
Compression test it first as could be a ring or ringland
I say that as it takes a fair amount of time to do the stem seals with the head in place which could well be a waste of time and money if it's piston related


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5 Re: Valve stem seals on 16th November 2014, 7:04 pm

PartyPete

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It had an engine health check a month ago, compression was very good and there was no cylinder leaks

6 Re: Valve stem seals on 16th November 2014, 7:10 pm

GTI-R US

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So does it smoke on boost or what?


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7 Re: Valve stem seals on 16th November 2014, 7:31 pm

GTIR James


Do a leak down test over a compression test. If stem sills were that bad you would have oil coming down the stem onto the valve seat which in time will contaminate the valve sill causing low compression.

8 Re: Valve stem seals on 16th November 2014, 8:03 pm

PartyPete

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Yea it smokes on boost, never heard of a leak down test?

9 Re: Valve stem seals on 16th November 2014, 8:46 pm

Bones

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We use to do these on other cars by connecting a drilled out spark plug to an air hose to hold up the valve and just replace the stem seals without removing the head. Is it possible to do this on the R?

10 Re: Valve stem seals on 16th November 2014, 9:25 pm

PartyPete

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the one star club
I saw some one put a load of rope down into the the cylinder until it was full?!

11 Re: Valve stem seals on 16th November 2014, 10:01 pm

Gostek

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@PartyPete wrote:I saw some one put a load of rope down into the the cylinder until it was full?!

I've done it like that lol! You just need special spring compressor and load of patience

12 Re: Valve stem seals on 16th November 2014, 10:13 pm

PartyPete

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I don't have much patience lol! Really want to stop it using oil though

13 Re: Valve stem seals on 16th November 2014, 11:12 pm

Bones

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We use to fill the cylinder with compressed air then put a socket over the spring and hit it with a hammer till the collets came out. Change the seal then had two screw driver or something like that that we used to use as a lever to compress the spring while we put collets back. Did it on mini's back in the day and it worked a treat

14 Re: Valve stem seals on 16th November 2014, 11:19 pm

GTI-R US

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Management
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Yeah nylon rope down the plug hole works fine or air compressor but ropes easier unless you have a spring compressor it's not an easy job on the R getting the collets back in especially as they are double springs.

I still doubt it being those though
What were the comp readings?
check them yourself as sometimes too higher reading is as bad as too low. I've seen rings stick on Pistons (especially forge) when they get overly carboned which then can give you a high but false reading where oil still bypasses the control rings


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15 Re: Valve stem seals on 17th November 2014, 3:07 am

Gaz GTiR

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Rule of thumb is: If its BLUE smoke!

Smoke on idle = Valve stems/Turbo seals
Smoke on boost = Rings
Smoke on overun = Turbo

That's usualy a dummys guide at what to look for, but to be honest it could be any 1 of the above as Forced inducted engines can have a mind of there own!

But as Bob says, Doubtfull its Stem Seals if it only smokes on boost :/

I used to own Renault 5 turbo's a few years back & they was renouned for blowing the valve stem seals of the head & just moved freely up & down the valve... Hence why a lot of people don't use valve stem seals atall on 5 turbos anymore!

But as said, they only smoked at idle on 5s, or on cold start up

16 Re: Valve stem seals on 17th November 2014, 8:16 am

PartyPete

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the one star club
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I'm not sure what the readings were, he just said it was a very good engine, with good readings! I'll try and get one done soon and let you know, hope it's not oil control rings Sad

17 Re: Valve stem seals on 17th November 2014, 12:19 pm

GTI-R US

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Management
Management
just buy one pete from halfrauds there not expensive

as said though some garages see a high compression reading on these and mistake that for being good when in fact its far from it

iirc mark (buckym) on here bought his car to us some years back which was putting out lots of blue smoke on boost and compressions came out between 180 and 210psi on respective cylinders which threw me at the time but when we pulled the lump apart the control rings were seized solid with lots of carbon behind them and scraper rings also and this was letting by oil which then turns to more carbon and problem gradually gets worse

hope that's not the case with yours so need those readings really to scrub that out


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18 Re: Valve stem seals on 17th November 2014, 12:24 pm

PartyPete

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Right I'll get a compression tester asap and let you know the results

19 Re: Valve stem seals on 17th November 2014, 9:33 pm

PartyPete

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the one star club
the one star club
Ok the results, this is taking the plugs out 1 by 1
Cylinder 1
155psi
Cylinder 2
152 psi
Cylinder 3
155 psi
Cylinder 4
162 psi
And now with all the plugs out at once
Cylinder 1
155 psi
Cylinder 2
158 psi
Cylinder 3
155 psi
Cylinder 4
162 psi
So what do you guys reckon?

20 Re: Valve stem seals on 17th November 2014, 9:40 pm

GTI-R US

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Management
Management
Well that's pretty much spot on tbh which is a good thing

So that can only really leave the stem seals so give it a go with those but don't get patent ones use the genuine nissan ones as the others are not a good fit and tend to go brittle after a bit


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21 Re: Valve stem seals on 17th November 2014, 9:47 pm

PartyPete

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That's what I thought tbh! So we're going with that then bob?

22 Re: Valve stem seals on 17th November 2014, 10:12 pm

Gostek

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Events Organiser
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hijacked what about cometic or supertech stem seals?? Are they any good??


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23 Re: Valve stem seals on 17th November 2014, 11:00 pm

GTI-R US

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Management
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Never used the super tech ones so can't answer with regard to those but the cosmetic ones are not good

I've used 2 pattern makes in past and wasn't happy with the fit so now will just pay extra for the genuine nissan ones, just not worth the agg tbh


Yeah do them pete at least you have narrowed it down now with your own test

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24 Re: Valve stem seals on 18th November 2014, 6:15 am

PartyPete

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Ok, cheers bob, back to my original question of any links or how to videos etc?

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