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Messages - sgould

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1
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 27 March 2024, 10:04:36 PM »
I found this, but it doesn't give any model split.  But it does show regional distribution.

https://www.autoinsider.co.uk/cars/saab/reports/regions

2
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 27 March 2024, 06:43:24 PM »
Looks to be very rare :D

But "How Many Left"  are in the hands of the original dealers who described the car on the original registration document.

3
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 27 March 2024, 05:26:53 PM »
Whisper...

There's a guy on the facebook page of the Saab Owners Club looking for a diesel NG 9-5 as his has just been written off...........  :)

4
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 25 March 2024, 09:32:41 PM »
That's great! :)

5
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 25 March 2024, 08:29:25 PM »
Good luck! :)

6
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 25 March 2024, 05:49:32 PM »
Looking at the options side by side, it does look as if the metal one is a bit thicker than it needs to be, but the idea is sound.

I think I would go for the new seal, bought from a reputable source, and add some sealant to fix it.  As long as the sealant doesn't degrade it.  If it does harden and let in air, it looks as if the air can only get in between the flange faces.  If so, and the sealing ring seals radially, and not by crushing, some sealant on the flange faces would work as the seal won't be relying on an absolute face to face touching.


7
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 25 March 2024, 02:08:18 PM »
Yes, "gluing" in the sealing ring would make sense.

A couple of further thoughts...

Is the problem of air ingress into suction pickup pipe allowing it to drain down and empty?  Or is it that the air through the seal is allowing air ingress for the pump to suck air? 


If it's air entering to allow the pipe to drain down, it would only drain down to the level of the oil in the sumo, so maybe not much in practice. But is it this that's allowing the air in?  Could it be a poorly seating pressure relief valve?  This could allow the system to drain down and empty the pump itself, which would be more serious.  In addition, could the same thing happen if there is a non-return valve in the oil filter?  On the old cars there was a cheap "paper" flap to stop the oil filter emptying.

If the air through the seal allows the pump to suck air, why would it not continue and leave the oil "unsucked up".

Maybe the hardening of the seal has been blamed in the past in error?

8
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 25 March 2024, 10:21:08 AM »
I’ve had another look at the pictures and it seems that the pick-up is fastened to the engine block with a bolted flange that is very similar to the way a carburettor is fixed.  Why isn’t a flat gasket used instead of an O ring type thing?  Would the best answer be to fit a new standard ring and put a very thin gasket on the flange?  Or just a wipe of Loctite anaerobic sealant?

9
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 25 March 2024, 10:11:19 AM »
The comment about Frank might be valid, but I’m not sure how he has measured the flow.  Or whether any failures are actually due to the Polish part.

I have never seen the insides of a GM diesel engine, so my suggestions may be wrong.  I’ve only just realised that your picture shows the pick-up pipe lying unfastened in the sump.  Is the seal just a squidgy bit of rubber pushed into the pick-up pipe?  Or is there a spigot on the pick-up that goes into bottom of the engine with the seal around it?

We used to analyse head (pressure) loss in a pipe using diameter and velocity only.  There is a table I have somewhere that converted head loss at step changes in diameter into “effective length of pipe”.  The effective length was measured in pipe diameters.




10
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 24 March 2024, 11:56:59 PM »
What you are really looking at is total head loss along the length of the pipe.  A short length of slightly reduced diameter is unlikely to generate a major head loss. 

You could look at the strainer as a lot of small orifices, then allow for a few to get blocked.  The head loss there could be the significant point.  In fact, if you think about it, it may be a slightly blocked strainer that increases the pressure drop in the following length of pipe towards the pump which is the reason the joint that you are replacing sucks air.

The comment you found about not using the Polish part as it reduces the diameter doesn't give any evidence that it actually causes a problem.  It sounds to me like it's been made by someone who doesn't understand fluid flow.

11
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 24 March 2024, 08:25:55 PM »
If the new connector is very short, you may need to calculate the flow as through an orifice rather than through a pipe.  But looking at the pick-up, the strainer might be a bigger restriction.  Short minor restrictions in a pipe are not usually an issue, think venturis, the fluid will speed up a bit through the restriction.  It might help to smooth the edges of any steps in the internals of the completed pipework.  Not only to improve the flow, but to remove anywhere for any "bits" to catch and build up.

In addition, if you have a new clean system, it should also be a plus point.  The original design would surely have a bit of a safety factor.

12
New tyres from Costco fitted.  A good price on a pair of Bridgestone WeatherControl tyres.

I will have to get around to fitting them back on the car at some point.  The 18 inch winter tyres seem to be holding up well at the moment.

13
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 17 March 2024, 05:24:31 PM »
Gloucestershire would be a lot of Cotswolds. With the higher ground there would be more salt on the ground.  We are just outside London, on a steep hill which is a bus route.  I can't remember the last time it was salted/gritted.

14
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 17 March 2024, 04:33:42 PM »
Is the black stuff on the end, glue?

But the close-up makes it look like very poor casting.  Casting aluminium needs careful temperature control of the liquid metal and the rate of cooling.

We used to buy stuff from a manufacturer in the Midlands who specialised in aluminium casting. He showed us around his factory and they were making sumps for Saabs.  But he also cast the engines for the first batch of Hillman Imp engines because the new Scottish foundry construction was delayed.  His engines were fine.  The Imp was well known for engine problems, and they were down to the casting of the later engines.

15
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 17 March 2024, 12:30:59 PM »
It looks as if the recessed holes have failed with a  fatigue/stress crack around the edge of the recess.  Would it be worth trying to ease the sharp corner of the recess to prevent another stress crack forming?

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