Turbos & spndle play

[tuttle]

Hi all, I have a new (hybrid) turbo to play with I'm a bit concerned at the amount of play at the spindle- tiny amount laterally & prob 0.5mm up & down. The latter can be tightened down but I'm unsure howmuch to torque down on to the bearings here.Any general advice from the PH collective greatly appreciated, many thanks in advance.

[eliot]

Not an XS-Power / SSautocrome ebay turbo by any chance??

[Boosted Ls1]

When you guage the radial play make sure you use both hands moving together in the same direction otherwise you will get a truly exagerated measurement.

Boosted.

[tuttle]

eliot said:

Not an XS-Power / SSautocrome ebay turbo by any chance??

got it from a tuner in Japan. TD05/6 sh18g came with a Trust elbow,braided oil lines & all the bits.

[stevieturbo]

What do you mean you can tighten it down to reduce play ?

I'd be very surprised if that was in fact possible.

[Boosted Ls1]

stevieturbo said:

What do you mean you can tighten it down to reduce play ? I'd be very surprised if that was in fact possible.

And if you do try to tighten it down expect the nuts to be out of balance afterwards. I imagine they will have been machined for balancing purposes. Axial play should be minimal.

Boosted.

[stevieturbo]

The nut etc should tighten against a dead stop ?

As far as I am aware, you dont tighten the nut until axial play is within spec, and leave it like that ?

[Boosted Ls1]

stevieturbo said:

The nut etc should tighten against a dead stop ? As far as I am aware, you dont tighten the nut until axial play is within spec, and leave it like that ?

Agreed as the nut wouldn't be stretching it's threads ie, it won't be tight? It has to stretch in order to be tight.

Boosted.

[stevieturbo]

Therefore you cannot tighten it to reduce axial or other play.

Tolerances are built in, and not easily messed with as far as I know.

If its a new genuine unit, I wouldnt worry too much. Mitsi TD0 range are robust turbos, and Greddy's reputation is for quality product.

[tuttle]

Boosted Ls1 said:

stevieturbo said: The nut etc should tighten against a dead stop ? As far as I am aware, you dont tighten the nut until axial play is within spec, and leave it like that ? Agreed as the nut wouldn't be stretching it's threads ie, it won't be tight? It has to stretch in order to be tight. Boosted.

Thanks, that makes perfect sense, phew!. I haven't fiddled at all with the unit.Sorry if I did'nt explain very well.
p.s Can anyone suggest any good reading (not too heavy please) on turbo systems.

>> Edited by tuttle on Friday 16th December 09:38

[eliot]

"Maximum Boost" Corky Bell.