turbo tolerances ?

S

Steve Taylor

Guest

• Dec 6, 2004

• #1

In my 200 Tdi engine project's turbo,the radial play in the compressor
shaft is roughly 10 thou. Is this normal, and absorbed by temperature
changes/oil pressure, or does it need new bearings ?

Thanks.

Steve

 

A

Andy.Smalley

Guest

• Dec 7, 2004

• #2

"Steve Taylor" <[email protected]> wrote in message news:[email protected]...
> In my 200 Tdi engine project's turbo,the radial play in the compressor shaft is roughly 10 thou. Is this
> normal, and absorbed by temperature changes/oil pressure, or does it need new bearings ?
>
> Thanks.
>
> Steve

Still like new then
the shaft runs on a bed of oil in this gap
to change the bushes is not feasible as you have to split the turbine
and the compressor then rebuild and balance it bearing in mind they
can spin in excess of 100,000 rpm so any imbalance will show itself
dramatically

--
Andy

SWB Series 2a ( dressed as a 3) "Bruce"
It's big, it's mean it's really, really green

 

S

Steve Taylor

Guest

• Dec 7, 2004

• #3

Andy.Smalley wrote:
> "Steve Taylor" <[email protected]> wrote in message news:[email protected]...
>
>>In my 200 Tdi engine project's turbo,the radial play in the compressor shaft is roughly 10 thou. Is this
>>normal, and absorbed by temperature changes/oil pressure, or does it need new bearings ?
>>
>>Thanks.
>>
>>Steve
>
>
> Still like new then
> the shaft runs on a bed of oil in this gap
> to change the bushes is not feasible as you have to split the turbine
> and the compressor then rebuild and balance it bearing in mind they
> can spin in excess of 100,000 rpm so any imbalance will show itself
> dramatically
>
Thanks for that Andy,

I can get the bearings and seals repaired by AR Turbo systems in
Bradford for 125 quid, which I suppose must include rebalancing the
wheels.

10 thou play is usual ? Wow.

I have a nasty feeling the seals are goosed though because there was a
small pool of oil inside the compressor body when we removed all the hoses.

Steve

 

E

EMB

Guest

• Dec 7, 2004

• #4

Steve Taylor wrote:

> I have a nasty feeling the seals are goosed though because there was a
> small pool of oil inside the compressor body when we removed all the hoses.

The seals aren't a positive seal, they're just like a piston ring and
leak a bit. Try it first and see what happens - it sounds like it could
be fine.


--
EMB

 

N

Nige

Guest

• Dec 7, 2004

• #5

Steve Taylor wrote:

>
> I can get the bearings and seals repaired by AR Turbo systems in
> Bradford for 125 quid, which I suppose must include rebalancing the
> wheels.

Is that the lot on Killinghall road?

>
> 10 thou play is usual ? Wow.
>
> I have a nasty feeling the seals are goosed though because there was
> a small pool of oil inside the compressor body when we removed all
> the hoses.

Seen it before on my old R5 gt turbo, nowt wrong with it as i had it checked by a local turbo
specialists.

>
> Steve

--
Subaru WRX (The Bitch)

 

S

Steve Taylor

Guest

• Dec 7, 2004

• #6

EMB wrote:

>
> The seals aren't a positive seal, they're just like a piston ring and
> leak a bit. Try it first and see what happens - it sounds like it could
> be fine.
Hmm. Thanks for that too. The engine had 190,000 on it and the middle
two pistons had failed, with scoring from bits released from the top
edge of the pistons on the front walls of both pots.

My working thesis was that the engine had at some point runaway, from
the oil drawn in from the bearings, but I don't know what the working
tolerances are supposed to be.

Steve

 

S

Steve Taylor

Guest

• Dec 7, 2004

• #7

Nige wrote:

>>I can get the bearings and seals repaired by AR Turbo systems in
>>Bradford for 125 quid, which I suppose must include rebalancing the
>>wheels.
>
>
> Is that the lot on Killinghall road?

I think so.

>
>
>>10 thou play is usual ? Wow.
>>
>>I have a nasty feeling the seals are goosed though because there was
>>a small pool of oil inside the compressor body when we removed all
>>the hoses.
> +
>
> Seen it before on my old R5 gt turbo, nowt wrong with it as i had it checked by a local turbo
> specialists.

Sounds like I am worrying un-necessarily.

Steve