I have a 1988 mkIII whith the 7mgte that i just rebuilt 800 miles ago it has je pistons and total seal rings head was gone through and all seals were replaced everything machined and it was done right then the stock ct26 went and i replaced it with a aftermarket setup with the t4 60-1 and now im getting smoke out of the exhaust and its blue and only when i back down on the rpm band and under hard hard boost so im trying to figure out where its coming from so it can quit using oil. there is hardly any blowby and i put a brand new cometic headgasket on it custom 3mm with arp studs so im really having a hard time thinking that it is the headgasket beeing 800 miles on the motor and its never overheated once.
Yes, blue=oil. I have to think to start on the turbo. Perhaps the seals are going out, or you've over oiled it (too large a fitting). I'd also run the gambit on a dry, wet and leakdown compression test. Very few people have any luck with total seal rings on the 7M. Hate to mention that after you built it, but it's the reality of them.
well i just replaced the turbo with a upgraded 60-1 and i am running a 1/8 feed line and a 1/2 drain line to the pan. and what doesnt make any sense is before i did the turbo and everything it never smoked. so yea turbo sounds like a canidate. possibly over oiling it and pushing through the seal.
Your feed is smaller than most at 1/8, and your drain is close to the norm, which leads me away from over oiling as a culprit. Perhaps it's the seals. I would still do fulll once over on the engine unless you have a second known good turbo laying around. Far cheaper to test the compression and rule that out than toss in a new turbo.
i reduced my feed line down from 1/8 to a 1/16 line and it helped the smoking out a ton and i ran compression on the engine and im getting 125- on 5 cylinders and 118 on the 6th and leaked down is all between 20-25% which is low so i think from having the larger feed line it ruined the seals so i think im going to buy a seal kit for my t4 and rebuild and hope for the best. any other thoughts of any problems?
Nothing else I can think of for the moment, ouside of valve stem oil seals, but they wouldn't go away when you changed oil feeds, and you would get a puff of blue every time you started the car. The oil return line may also be a hair small, but while normally I wouldn't think it to be too much trouble, given how small your feed was, perhaps a little larger would help? Most I see use a -10, which would be 5/8 inch vs the 1/2 inch you are using.
well to do a bigger line is a little hard to do so im gonna buy the seals for the turbo and hope it fixes it. i cant see it being valve stem seals because the engine is so new so im gonnna pray it fixes it but and as far as rings and headgasket i cant see them being likely because everything was replaced with good parts. so i geuss all i can do is try it.
yea thats what im beleiving so im gonna buy a kit today and im wondering if its still alright to drive since its not smoking al lthe time as long as i keep an eye on the oil level.
shoudl be ok...its a daily for me so i dont havemuch choice
yea well im just gonna buy another turbo i tryed to take it apart today and the sht snapped off....i bought it from a place called ss auto chrome....peice of s*** and its the second one.
emailing them tonight about it and so yea im just fed up with it
well what i have found out is that my rings on number one cyclinder have basically gone and that its either that or my guides have worn so bad which doesnt make any sense so basically im after a whole nothing engine rebuild and im not to pleased with it and my machine shop is not backing up the work that theyt just did no more than a year ago and has just over a thousand miles on it i found this out becasue i tore the turbo completly off and smoke was still there so basically that told me right awayt
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