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The mkiv Supra Owners Club

Stem Seal replacement


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Morning all

Since having the single put on the car I've been having a ploom of blue smoke out the back on start up (not at any other time) ecu was changed as it was thought to be fuel starvation, but it smells like oil and is getting worse, and I think it must be the stem seal. So my question is what sort of price is it to get these done?

Chees

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Bloody hell really!! Is it an easy job to do yourself?

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It depends what you class as easy. It's a relatively straight forward job but you need to be competent with a socket set and have all the appropriate tools for torquing the cams/head etc.

 

There are also 2 ways you can go about the job, one involves taking the head off (gasket kit required) and the other involves the head on (rope trick). The latter can be a little bit uneasy at times due to the fact that if you drop anything you need to strip the head.

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It depends what you class as easy. It's a relatively straight forward job but you need to be competent with a socket set and have all the appropriate tools for torquing the cams/head etc.

 

There are also 2 ways you can go about the job, one involves taking the head off (gasket kit required) and the other involves the head on (rope trick). The latter can be a little bit uneasy at times due to the fact that if you drop anything you need to strip the head.

 

Ok mate, by the sounds of it it's out of my league :)

Thanks for info Scott.

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Just thinking if I had a leaky injector would that cause blue smoke and lumping idle? or would it be black smoke? Afr's very massively, from 14's down to 11's on start up.

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Cold start should be 11s, warm start should be 13s creeping into 14s.

 

As already said I think black smoke would point to the injectors (overfueling).

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Ok pal thanks. That's what I thought. Is it wise to get the stem seals done ASAP? I'm worried it's gonna cause det when in in boost.....

 

Not sure how much of a concern it is with a single turbo, but I know it isn't cause for alarm when running BPU etc. I can't really see it causing much of an issue to be honest but wait for more experienced replies just in case :)

 

I would definitely get it seen to, but I wouldn't be in a major hurry personally.

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It wont cause det, you only get smoke because a bit of oil has settled in the chamber. It doesnt take a lot of oil to make a lot of smoke.

 

Ok mate I understand. So the oil will be leaking into chamber therefor on the piston correct? If so surely itsgonna cause damage to face of the piston? Or am I completely wrong?

Cheers

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Not sure how much of a concern it is with a single turbo, but I know it isn't cause for alarm when running BPU etc. I can't really see it causing much of an issue to be honest but wait for more experienced replies just in case :)

 

I would definitely get it seen to, but I wouldn't be in a major hurry personally.

 

Ok matey cheers, it's pretty embarrassing when you start it up and it takes a good 3-5 seconds to start then a ploom of smoke :)

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Ok mate I understand. So the oil will be leaking into chamber therefor on the piston correct? If so surely itsgonna cause damage to face of the piston? Or am I completely wrong?

Cheers

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Wont cause any damage at all, it may coke up over time but wont cause any damage

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Just been thinking the car regardless of how long it's left for hesitates to start and always throws blue smoke out the back, so the sals must be in pretty bad condition if they are leaking when warm!

 

Is it definitely blue smoke? If so then it sounds like they are well and truely gone and dropping a fair bit of oil into the chamber(s). The fact that you can turn it off and start it up to see yet more smoke would lead me to believe it's leaking pretty badly. Being warm or cold doesn't really matter, it's a time thing with regards to how much oil drops into the chamber. if left for an hour or so you could imagine a few drops getting in there. If it's happening with you after a few minutes then that would suggest them leaking quite badly.

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Is it definitely blue smoke? If so then it sounds like they are well and truely gone and dropping a fair bit of oil into the chamber(s). The fact that you can turn it off and start it up to see yet more smoke would lead me to believe it's leaking pretty badly. Being warm or cold doesn't really matter, it's a time thing with regards to how much oil drops into the chamber. if left for an hour or so you could imagine a few drops getting in there. If it's happening with you after a few minutes then that would suggest them leaking quite badly.

 

If left for an hour you get hesitant start and blue smoke as you would if left over night. But if left for a few mins it's just a bit of a bitch to start no smoke.

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