How to tell condition of 2nd hand t28?

~SlideWays~ · Post by **~SlideWays~** » Fri May 13, 2005 3:52 pm

Im thinking of buying a 2nd hand t28, apparently it has no shaft play. Would this be a good indicator of its condition (oil seals?)?

I there a way a mechanic/whatever can test a turbo with out pulling it apart?

Also does anyone know the specs of a t28 vs t25g?

Thanks in advance

mike simmonds · Post by **mike simmonds** » Fri May 13, 2005 8:03 pm

u dnt want any shaft play backwards and forwards, i dnt kw of anyway u could tell if the seals are fukt without running it. i would also look 4 cracks and see if exhaust wheel is chippd and if compressor wheel is fukt b4 buying

RS13 · Post by **RS13** » Sat May 14, 2005 7:41 pm

Yeah, look for cracks around where the wastegate flap shuts on the exhaust housing, some shaft play is normal, so thats' not a good indicator. It always pays to get any turbo rebuilt when you get it anyway, for piece of mind. New oil seals installed cost me $300, with a new exhaust housing, expect to pay a bit more at Turbo tech etc.

evil_si · Post by **evil_si** » Sat May 14, 2005 7:51 pm

check the eshaust housing and turbine wheel, if they are 'wet' looking or have a bit of build up of black carbon etc it is not a good sign,

the best way to tell if a rotary turbo is good, is the exhaust wheel will be a goldy brown
this also applies a lil to piston turbos, but it will not be as gold.
a black exhaust turbine in a rotary turbo indicates its oil seals are gone.

is it a roller bearing t28? or a bushed type, from what ive been told the roller bearing ones are not rebuildable