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The mkiv Supra Owners Club

Stem Seal replacement


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The leakdown and compression check will tell you. If the results are low, there is some trick where you add some oil to the cylinder via the spark plug hole and retest - if the compression goes back up, you've got worn rings/bore and the oil is helping seal it. (If it doesn't go up it's a valve leak)

 

Ok Ian thanks allot for your help and info. Should I be driving it at the moment?

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Ok Ian thanks allot for your help and info. Should I be driving it at the moment?

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You need to get a leakdown test done NOT a compression test, if the test shows wear then whoever is doing it should be able to narrow down where its leaking, if you hear a hiss from the inlet manifold it is an inlet valve, if it hisses out the exhaust pipe it is an exhaust valve and if its out the dipstick or oil filler it is rings, none of this will tell you if the oil control rings are worn, BUT if all else seems fine then that is the logical fault.

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You need to get a leakdown test done NOT a compression test, if the test shows wear then whoever is doing it should be able to narrow down where its leaking, if you hear a hiss from the inlet manifold it is an inlet valve, if it hisses out the exhaust pipe it is an exhaust valve and if its out the dipstick or oil filler it is rings, none of this will tell you if the oil control rings are worn, BUT if all else seems fine then that is the logical fault.

 

Thanks dude appreciate your help, if it was rings that needed changing etc what sort of cost is it?

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  • 3 weeks later...

Just an update on this, spoke to ryan the other day and im gonna drop it to him and hes gonna see if the seals are leaking by starting the car, running it for a while then leaving over night and using some kind of uber small camera to see if oil is on the pistons.... cheers

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ITRO £1000 if you are paying someone to do it.

 

I'll do it for £500 :D

 

just as a idea i went into mr t in peterborough there labour working of book without parts its £1634 +vat the stem seals (24 seals) are £154 inc vat so £500 sounds a bargin tbh

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  • 1 year later...

Sorry to pull this out the wood work but as the car is still playing up, this is a pic of the spark plug. All of the them are the same.Soorya bout quality.

As you can see the rim is extremely burnt and it stinks of fuel and oil.

photo.jpg

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