Alan Cole

My 9k developed a coolant leak recently, which took me a while to track
down. I eventually traced it to the point where the crankcase breather
connects to the air intake (just before the turbo).

Right next to it, there is a small rubber pipe apparently going into the
intake. The other end connects to a thin metal pipe which went off
around the block somewhere.

Anyone know what on earth this is for? Some primative form of water
injection maybe? ) It's the last place I was expecting to find
coolant! Or is it a vacuum pipe and something else is leaking into the pipe?

Regards,
Alan

P.S. a similar thin metal pipe goes into the turbo and out the other
side - are they water cooled? I thought they were oil cooled?

Grunff

Alan Cole wrote:

> P.S. a similar thin metal pipe goes into the turbo and out the other
> side - are they water cooled? I thought they were oil cooled?

The turbo is oil luvricated - the brearing is an oil-film bearing. The
oil also carries some heat away from the turbo, so you could say it's
oil cooled. But in addition, it has a coolant sleeve surrounding the
bearing housing. So it's water cooled.

Turbos on most C900s do not have the water cooling (the later ones do).
But all 9000Ts are water cooled.

--
Grunff

Richard Sutherland-Smith

In message <2g7k8dF5gtvbU1@uni-berlin.de>
Grunff <grunff@ixxa.com> wrote:

> Alan Cole wrote:
>
> > P.S. a similar thin metal pipe goes into the turbo and out the other
> > side - are they water cooled? I thought they were oil cooled?
>
> The turbo is oil luvricated - the brearing is an oil-film bearing. The
> oil also carries some heat away from the turbo, so you could say it's
> oil cooled. But in addition, it has a coolant sleeve surrounding the
> bearing housing. So it's water cooled.
>
> Turbos on most C900s do not have the water cooling (the later ones do).
> But all 9000Ts are water cooled.
>
> --
> Grunff

Oh no no no...........
The 9000 gained water cooling in 1987 and the 900 a year later!!!
--

Richard & Mary Sutherland-Smith
19 Webb Road, Wanganui
New Zealand

Grunff

Richard Sutherland-Smith wrote:

> The 9000 gained water cooling in 1987

Oh, ok - didn't know that there were 9ks in the first 2 years which were
non-water-cooled.


> and the 900 a year later!!!

Yes, ergo _most_ C900 turbos were not water cooled!

--
Grunff

Jean Paul

Hello Allen,
Let me take a stab at this. Its to late tonight to go down back to look at
my 89 9000 2.0L, but I think its similar to my 94 9000 2.3L. The pipe
enclosed in rubber that goes from the large plastic inlet pipe to the turbo.
Is a crankcase breather pipe hooked to the valve cover. Saab for what ever
reason ( maybe to heat the air being sucked into the intake, to cut down on
moisture in the engine) put a small heater hose,(if you would call it that)
that splits off and goes to the front side of the throttle body, and heats
it so that it does not freeze in the winter.The other side of the throttle
body the small hose is the return side I think and hooks to the pipe that
goes around the back side of the motor to the RH. side to the water pump.
The small three inch hose you talked about I had to replace on mine. I this
case water and air should not mix, just live in the same hose.
Jean Paul
89 9000s
89 9000t
94 9000cset




"Alan Cole" <a.cole@ntlworld.NOSPAM.com> wrote in message
newsRwnc.223$D%1.194@newsfe1-win...
> My 9k developed a coolant leak recently, which took me a while to track
> down. I eventually traced it to the point where the crankcase breather
> connects to the air intake (just before the turbo).
>
> Right next to it, there is a small rubber pipe apparently going into the
> intake. The other end connects to a thin metal pipe which went off
> around the block somewhere.
>
> Anyone know what on earth this is for? Some primative form of water
> injection maybe? ) It's the last place I was expecting to find
> coolant! Or is it a vacuum pipe and something else is leaking into the
pipe?
>
> Regards,
> Alan
>
> P.S. a similar thin metal pipe goes into the turbo and out the other
> side - are they water cooled? I thought they were oil cooled?

Alan Cole

Jean Paul, I just changed the hose this evening, and now it all suddenly
makes sense. The change from metal pipe to rubber pipe confused me,
plus I thought it was a vacuum hose going into the throttle body. Then I
thought maybe the engine was sucking up coolant?!? What a strange design!

BTW, the old rubber hose had started breaking up, and just fell apart in
my hands when I took it off. I replaced it with some reinforced fuel
line pipe which should last a lot better.

Thank you,
Alan

Jean Paul wrote:
> Hello Allen,
> Let me take a stab at this. Its to late tonight to go down back to look at
> my 89 9000 2.0L, but I think its similar to my 94 9000 2.3L. The pipe
> enclosed in rubber that goes from the large plastic inlet pipe to the turbo.
> Is a crankcase breather pipe hooked to the valve cover. Saab for what ever
> reason ( maybe to heat the air being sucked into the intake, to cut down on
> moisture in the engine) put a small heater hose,(if you would call it that)
> that splits off and goes to the front side of the throttle body, and heats
> it so that it does not freeze in the winter.The other side of the throttle
> body the small hose is the return side I think and hooks to the pipe that
> goes around the back side of the motor to the RH. side to the water pump.
> The small three inch hose you talked about I had to replace on mine. I this
> case water and air should not mix, just live in the same hose.
> Jean Paul
> 89 9000s
> 89 9000t
> 94 9000cset
>
>
>
>
> "Alan Cole" <a.cole@ntlworld.NOSPAM.com> wrote in message
> newsRwnc.223$D%1.194@newsfe1-win...
>
>>My 9k developed a coolant leak recently, which took me a while to track
>>down. I eventually traced it to the point where the crankcase breather
>>connects to the air intake (just before the turbo).
>>
>>Right next to it, there is a small rubber pipe apparently going into the
>>intake. The other end connects to a thin metal pipe which went off
>>around the block somewhere.
>>
>>Anyone know what on earth this is for? Some primative form of water
>>injection maybe? ) It's the last place I was expecting to find
>>coolant! Or is it a vacuum pipe and something else is leaking into the
>
> pipe?
>
>>Regards,
>>Alan
>>
>>P.S. a similar thin metal pipe goes into the turbo and out the other
>>side - are they water cooled? I thought they were oil cooled?
>
>
>