when people refer to a worn turbo seal - is it the bit that sits inside the main turbo that the fluid bearings sit in that hold the turbine shaft?

 

or is it a seal somewhere else :)

when people refer to a worn turbo seal - is it the bit that sits inside the main turbo that the fluid bearings sit in that hold the turbine shaft?

 

or is it a seal somewhere else :)

:D

so that will mean the blade should wobble a tad if seals are going. Is there another seal or is that the only one mate?

Is that where the bearings would sit as I cant see how its sealed for the high speeds and temp?

 

Ta

Sorry but getting right into this turbo malarkey :)

 

red - turbine end bearing

green - oil feed to bearing and holes in bearing

yellow - turbine end seal

 

so that will mean the blade should wobble a tad if seals are going.

no, the bearings hold and align the shaft.

 

Is there another seal or is that the only one mate?

there is one at the compressor end too, around the oil slinger.

there will also be an o-ring and oil seal plate at the comp end

 

I cant see how its sealed for the high speeds and temp?

the seals are there to stop oil leakage at all times (especiallay at idle/low turbo speed) and also to reduce blow by at high speed

Bloody good question mate. These turbo seals were once described to me as "a £6 part which needs a £1,000 labour to replace". However, no-one has ever come up with a part no for the seal.

 

http://www.300zx.lv/catalog/?gr=A&sec=144&pic=B01

 

So, and given that a bearing at that rpm and temperature must be a b*gger (clearly it's not a rubber o-ring seal hehe) I am wondering whether "seal" in this case just means the tolerance between the moving bit and the surface against which it is bearing. So not a real part at all - just how it fits.

 

And therefore, if you've got old / knackered turbos, those surfaces no longer mate correctly and oil leaks past to give us the old plue smoke.

 

Anyhoo this is just my non-mechanical stab-in-the-dark - anyone know for sure?

Aha - beaten to the "post" :D

 

Ya5een - is that the Z32 turbos or just a generic cutaway?

 

And is it feasible to just replace the seal or if the seal is u/s then the whole unit is probably knackered so you might as well refurb?

 

So, and given that a bearing at that rpm and temperature must be a b*gger (clearly it's not a rubber o-ring seal hehe) I am wondering whether "seal" in this case just means the tolerance between the moving bit and the surface against which it is bearing. So not a real part at all - just how it fits.

 

 

the oil seals at each end of the shaft are basically minature piston rings

there is a seal, I know a member on here has rebuilt them for £22 with uprated seals from a garret maintenance pack. He has a faq ready to be posted in a few days with details on how to rebuild your own turbos

Aha - beaten to the "post" :D

 

Ya5een - is that the Z32 turbos or just a generic cutaway?

 

And is it feasible to just replace the seal or if the seal is u/s then the whole unit is probably knackered so you might as well refurb?

 

its a generic cutaway, had to root through a few work presentations to find it. i wish i had one for the Z32! it would be very difficult to get hold of a drawing unless you know someone who works at garrett that dsnt mind taking the risk

 

it really depends on how long the seal has been knackered and if the resultant cooking of oil has travelled down the shaft far enough to the bearing

there is a seal, I know a member on here has rebuilt them for £22 with uprated seals from a garret maintenance pack. He has a faq ready to be posted in a few days with details on how to rebuild your own turbos

 

Yep :D the stock seal is about 3-4 quid and a 'step gap' ring is about 11 quid.

 

 

Stock on left, Step Gap on the right

 

 

And the Turbo kit :D

At long last - it's taken me 5 years to find this out. :D Sticky this immediately! Ya5een :bow: for knowing the answer and Jay for asking :bow: and mtl for the pics :bow:

At long last - it's taken me 5 years to find this out. :D Sticky this immediately! Ya5een :bow: for knowing the answer and Jay for asking :bow: and mtl for the pics :bow:

 

LOL, wait to you see the write up on it, lots more High res pics ;)

Gio I agree. This thread alone is worth this years membership imho.

 

Thanks Yaseen & MTL for data.

Check it out boys and girls

 

http://www.300zx.co.uk/forums/showpost.php?p=385091&postcount=1

the T25 is the same as in the 200sx (s13) isnt it. and as you can bolt a T28 straight on the s13 Im presuming you could bolt 2 T28's straight on the zed. Im guessing then the larger injectors, IC's etc . . . .

Also... this is what I read earlier

 

http://auto.howstuffworks.com/turbo.htm

 

just for the newbies that want a basic understanding of turbo works :)

(I didnt realise as air heated up molecules became larger thus a larger intercooler allows for cooler air whic means more air molecules for bigger bang!!! :) )

Good write up MTL, best I have read so far. One question, where do you get it balanced? And how much? Thanks.

Good write up MTL, best I have read so far. One question, where do you get it balanced? And how much? Thanks.

 

Well anywhere that rebuilds turbos will have the tools, but they may get funny as they did not do the work. There is also a few companys on the net that will balance them. I think the cost was about £50 for mine.

(I didnt realise as air heated up molecules became larger thus a larger intercooler allows for cooler air whic means more air molecules for bigger bang!!! :) )

Just to be pedantic, the molecules themselves will only become very very slightly larger. The main effect is that hot air becomes less dense as the energy of the molecules mean they zap around a lot more. The colder something is, the less the molecules move and the gas gets more dense. More dense = more molecules in a given volume which does what you said :D

Are you saying that a dodgy turbo can be overhauled this easy, I always understood that it required balancing afterwards etc, my last turbos overhaul was £600 which is supposed to be comparatively cheap! - you mean I could have done it myself for a few quid?

 

Forget it just read the thread properly.

Are you saying that a dodgy turbo can be overhauled this easy, I always understood that it required balancing afterwards etc, my last turbos overhaul was £600 which is supposed to be comparatively cheap! - you mean I could have done it myself for a few quid?

 

Forget it just read the thread properly.

 

Err, yep! Cost me a little under £90 for the parts and 2 step gap uprated seals too. Then a few quid to a company to balence the turbos.

OK, thanks, is that £50, a pair? Only asking so Im know what is a good price etc. And with reard to 360 thrust washers, do these just replace the standard ones? And if you dont mind, when fitting roller bearings do you need to machine anything or are they a straight swap? Thanks.

OK, thanks, is that £50, a pair? Only asking so Im know what is a good price etc. And with reard to 360 thrust washers, do these just replace the standard ones? And if you dont mind, when fitting roller bearings do you need to machine anything or are they a straight swap? Thanks.

 

I think it was £50 each, but I could be wrong. Took ages to find a place to do it though.

 

360 Thrust is simply a case of changing the thrust plate and collar, its usualy a direct replacement.

 

As for roller bearings, this requiers machining of the CHRA and as of yet have not round anyone that can supply the bearings. Also I would not recomend fitting them yourself.

Thanks....