Turbo bearings
Turbo Mini Forums

Im currently rebuilding an 1987, 65k turbo engine.

I now have the turbo off but im slightly concerned that i can feel play in the turbo bearings when i wobble one end on the shaft. This cant be normal, or is it due to no oil running through the housing?

Secondly if it is nackered:
-What will happen if i use it anyway?
-Is it repairable, ive heard of bearing kits. Or would i have to give it to a turbo repair company?
-How much is a new one?
-Finally, I know its a garret, but T? ?

Thanks

Yes, Im getting there.....

www.itsmuckingfagic.com

which way does it wobble?

in and out is the direction that is BAD!

There will always be a little side to side movement as the bearings "float" on oil.

If you use it and its knackered you won't get any boost.

Its repairable, but the more damaged it is, the more dificult it is to fix and the more new parts will be needed. DIY is an option but its only "so" sucessful, and you need to know what you are doing.

A new one from turbo technics is about ?305.00 + vat + carriage.

Its a garrett T3.

Alex

AlexF

i do the kits for ?50inc post

Up to you if you think you have the ability to do it though

It wobbles side to side (feels fine in and out), There feels like more play in the inlet side than exhuast. Im guessing about 0.5mm of play the inlet side and about half that the exhuast end.

Yes, Im getting there.....

www.itsmuckingfagic.com

get a metro haynes manual. describes exactly how to measure it all up in the supplement

They will wobble side to side slightly. But like someone else said it is in and out that is more of a problem.

Out of interest, those of you that have rebuilt your own turbo, how have you re-balanced the assembly afterwards? As with the speeds that the shaft spins at this is important that it is right?

most people mark up and put back together as they came apart...

then they hope.

alex

AlexF

arr right......

braver people than me then!!!

aye and me...

no point rebuilding a turbo to risk the balance and then let it wruin your hard work and possibly the engine!

alex

AlexF

Especially given the configuration of an a series......

I have spent what seems like a small fortune on s/c gearbox and drops, modified block and head etc etc, if the turbo failed I know the whole lot would probably be scrap.......

A word of note to anyone considering doing this, I was lucky to have a mate that worked at TT in Northampton for a time, so he rebuilt and balanced my turbo for me. I think he said that they balance the turbos to something like 100,000rpm, and to within 0.1 grams. (That is from memory). Worth thinking about how much a slight inbalance on a compressor wheel is magnified into a centrifugal force when spun round at 100,000rpm....as centrifugal force due to inbalance increases by the square of speed......or have I got that the wrong way round....anyway you know what I mean....monday morning and brain is asleep......

centrifugal or centripital ?? lol

well centripetal acceleration he means of course!

alex

AlexF

well of course centrifugal force doesnt actually exist........ its a negative centripetal acceleration
ahem.. lol

negative centripetal acceleration ?????

WAUW, I will think of such words in a minute or two, do they actually have to mean something?

Iain what kits do you do for T3.

Timewarp!

Congrats on using the search function to its full effect. :)

However this thread is about 6 years old. I would suggest that if you need a T3 rebuild kit you jump on ebay for one. These can be found farily cheaply on there.

Welcome to TM by the way.

If something is worth doing, it's worth doing half of.

I was under the impression that the turbine and the compressor are balanced "alone". This means that is doesn't really matter how you bolt it back together. This is Schwitzer and Garret ones.

Edited by Vegard on 9th Nov, 2010.

I,ll let you know, as I,m rebuilding the GT17 and will take a chance on it, just like Robert.

interesting,


http://www.youtube.com/watch?v=TMA5RFpGRbg

Thanks for the welcome ,didn't cop the date on the thread. Surprised to find so little info on turbo bearings on the site.
My question is ,is it best to stick with genuine Garret seals or maybe these
http://cgi.ebay.com/ebaymotors/T3-T4-Turbo...=item19b4cec9fd
and what do yous think of this
http://cgi.ebay.com/ebaymotors/T3-T4-Super...=item19c0bb543c

After been told by several suppliers that the kit for the metro turbo was no longer available I found a supplier that stocks them in the UK. RADesigns www.TurboRebuild.co.uk
The full kit is 707897-0001 and contains all seals bearings bolts and clamps. The kit contains a paper gasket instead of an O ring for the compressor housing but they can supply that seperatly.

How much do you think one of those is??!

Do you think they'll do a group buy discount??!

£84 + vat + delivery.

i have rebuilt all my turbo's (and a few mates) in the good ol' mark, disassemble, re-assemble way, and never had an issue.

when the rotational assembly of a turbo is balanced it is done out of the core, once balanced it is all marked up, dismantled and reassembled in the core, lining up the marks.

Vegard, afraid that cant be the case as the nut used to hold the compressor sometimes has balance cuts on it, the whole lot is done as an assembly.

All that said, my next turbo needs a new compressor (ingested a nut) and im going to risk it with a new wheel off ebay and just bolt it on, for my curiosity more than anything else, as if it works it meens i can start to experiment with DIY hybrids. if it doesnt, it was a £30 ebay turbo.. worth it for the knowledge.

EDIT, obviously i dont expect it to last 100,000 miles...

Edited by evolotion on 23rd Mar, 2011.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.