Show Posts

You can view here all posts made by this member. Note that you can only see posts made in areas to which you currently have access.


Messages - carrera

Pages: [1] 2 3 ... 74
1
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 27 March 2024, 11:20:32 PM »
Not so many in my neck of the woods, I must have most of them  ;D

2
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 27 March 2024, 07:24:11 PM »
Yeah, I understand the point, not much to be done if a dealer registers an AWD as not being an AWD alternative, but when it comes to trim level they should have a good idea and the engine / gearbox are important for CO2 based road tax, so should be of a decent quality

I had previously a look at the generic "Saab 9-5" listing, and while there are a few, none of them appear to be from the NG years. I think the engine size / model description generally helps there

Still, it's the best information we have, unless Saab GB have disclosed their information somewhere

3
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 27 March 2024, 06:33:45 PM »
Whisper... in which way

Suggesting I move this on, now it's fixed & I'm looking forward to the comparison with the Turbo4, or suggestion for another project to keep me busy & out of trouble  ;D

This is apparently an incrediby rare car, even before you consider the panoramic roof

How many left, or indeed How many registered. I had no idea.

4
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 26 March 2024, 08:51:15 PM »
Excellent - been following this with interest (and hope).

Thanks, I like to try to create a halfway interesting story, that may serve as a bit of a reference for the future.

MOT is booked for 5th April

I was hoping for Saturday or next Tuesday, but apparently they aren't working on Saturday & are busy because of something called Easter

Today I ordered a new cover for the DPF valve as there is still a (very) minor leak and an idler pulley for the drivebelt, taking a guess that it is this, rather than the tensioner which is making a little bit of noise when cold

5
New Saab 9-5 (2010 on) / Re: Another Ng 9-5 joins the forum
« on: 26 March 2024, 09:14:12 AM »
Little update:

The oil was on 3/4

Topped it up and on restarting the screeching at fast idle was gone, though it did return as a little boost was applied.

Perplexing as this indicates oil starvation to the turbo, but not the engine as there have been no oil pressure warnings. The sump is a different design to the TTiD as well, so not the same problem ???

6
New Saab 9-5 (2010 on) / Re: Another Ng 9-5 joins the forum
« on: 26 March 2024, 08:43:06 AM »
One step forward, one step back.

Having done the sump drop on the TTid, I set off for home.

There was a screeching from the car upon startup, which I rapidly discovered was turbo speed related.

Oil level is fine, strange that it appears to have failed so rapidly. Started the car this morning and its just the same, screwdriver as a stethoscope. I doubt the oil feed pipes are blocked

She was running so sweetly. Is she jealous of the TTid, or simply in a massive sulk because I visited a Vauxhall dealer yesterday  :-\

7
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 25 March 2024, 09:06:15 PM »
We have a runner !

My plan was to crank the engine a couple of turns to prime the pump, before going for a start.... but with push button start you don't really have that option. :(

Anyway, she started, the oil pressure red warning light didn't seem to appear and the important "Low Oil Pressure" dash warning didn't come on either, so I think that's that job done.

No leaks from the sump that I can see either. Ultimate test will be when I start her up again at the end of the week

8
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 25 March 2024, 06:11:45 PM »
I'm having a coffee break

That's the same conclusion I arrived at. Ironically, the GM genuine part from a Vauxhall main dealer was also made in Poland. The seal does operate by radial deflection.  :thumbsup:

I'm on my second sump fitting. The hard to access screw that secures the air separator connection went walkies when I was trying to fit it. It took me a while, but I finally figured out it had gone down the PCV hole into the sump  ::)  So remove, clean flange, replace making sure the two smaller Torx at the gearbox end don't fall out into the void in the bellhousing. There's a definite technique to making this job easy, Frank from MB Motors probably just whistles at the cars coming in by now.

From here-on in, it's just basic mechanical reassembly. Best remember to put some oil in

Thanks  :thumbsup:

9
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 25 March 2024, 03:07:54 PM »
From the earlier link https://www.alderleyautos.co.uk/blog/a20dth-engine/

Quote
The seal at the bottom where the oil pickup is starts to harden and then lets the oil drain back into the sump causing oil starvation and in the end, a goosed engine.

The seal goes hard, air is then sucked in which then causes oil starvation.

The first noticeable thing you’ll see is an “Oil Pressure Low – Stop Engine” error message every morning or when the car has been sat.

My way of thinking about this is that the tube, from the oil pump, which is above the sump just like on an OG, is effectively like a straw which was put vertically in water, with a finger over the end before the straw is withdrawn from the glass. The water stays in the straw due to air pressure on the bottom of the straw and a seal at the top. Remove the finger, air pressure is operating at both ends of the open column and so gravity takes over.

One the A20DTH engines etc, the oil pump is the finger and the poor seal allows the oil in the pick up tube to drain away, but very slowly as the warning light only starts to come on when cars have been left for 24 hours.

It has been suggested that as well as age, failed DPF regens allow diesel to enter the sump and the diesel attacks the seal in a way that engine oil does not and causes it to become hard

The lower sealing ring on the old one is definitely less flexible than the new one

Does that make sense ?

I am now with the engine... and have all options available. £17.50 from Vauxhall dealer, £43 from ex Saab dealer, £10 delivered from Neos. You can see just how much the lower part of the seal is deflected upon fitting. The red bit is the special tool for fitting, placed just above the feed tube


10
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 25 March 2024, 11:27:08 AM »
I'm not with the car, so can't take pictures, but the listing for the Polish seller has good pictures, numbers 2 & 8 are perhaps the best

11
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 25 March 2024, 10:55:48 AM »
Maybe this will help

https://www.ebay.co.uk/itm/285603835464?

The pick up pipe, which is a plastic assembly, is bolted to the sump in 3 places, two at the top and below the baffle. Those bolts are just for securing the position of the pipe.

The OE part (black bit) is a push fit onto the oil pump, the serrated bit reduces distortion as it pushed onto the outside of the gallery. The red bit is just for protection

The seal compresses against the flat plate, making an airtight seal, when new.

Then there's this suggestion to coat the  base of the OE seal in RTV to provide both bonding and chemical protection against future deterioration (point 2)

https://insignia-drivers.uk/forum/insignia-ownership-technical-workshop/engine-drive-train-transmission/362123-a20dtr-biturbo-tuning-guide-260ps-517nm-my-experience-with-dyno-print

Now I have the sump stripped the above post makes more sense to me than it did when I read it "cold"

Same as ZD19 / B207 apparently ?

12
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 25 March 2024, 07:10:30 AM »
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.

All the above understood & agreed

On the specific point, I'm sure that person doesn't understand fluid flow. But then there's another post about Frank from MB Motors in Keighley. Seems to have a good reputation, lots of people go to him to have this job done, from a long way away. He won't fit the modified part because at high speed, commented 80-90 mph = ~3000 rpm they do restrict oil flow. Same thread linked earlier, post number 38.

So, does he have the experience to know this, or, given that he will likely end up on the warranty hook if there is a failure, why would he take the risk ?

I don't feel as though I have enough information to attempt any proper calculations & am having a proper argument with myself this morning  ::)

13
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 24 March 2024, 10:07:09 PM »
Ok, so I realise i can't do a 3 year engineering degree in 30 minutes  :)

I looked at this https://engineerexcel.com/venturi-meter-and-orifice-meter-difference/ and considering your note above it seems I should look at putting some sort of taper on the underside of the aluminium component to reduce turbulence & effect on flow

With walls of 1.5mm I was also thinking of thinning those out, but then decided I didn't really have the right equipment

On other engines, I am used to there being an excess of capacity, such that the relief valve operates when the engine is cold and revs are moderate. As the oil heats up and becomes less viscous, the relief valve drops out of the equation and low pressure on hot idle is your early warning sign

Indeed, I did an engine once after a long drive at high engine speeds. Somebody pulled out which resulted in a need to drop speed, as soon as the revs came off one of the big ends started to knock & run the bearing. I had to pull over, let it cool down and then drove very modestly to get home

I too hope that the original design does have a bit of a safety factor. Todays engineers are often focussed on value engineering though. Interesting comment on the pickup though  :thumbsup:

I think I'll go for it, and see how it goes. After all, removing the sump isn't such a difficult or expensive job 


14
New Saab 9-5 (2010 on) / Re: Another Ng 9-5 joins the forum
« on: 24 March 2024, 04:17:20 PM »
So, 500 trouble free and full boost miles this week. It seems that MPG may be a little better than before too.

I had a present waiting for me when I got home. Oldish tech, because I understand how they work, not so sure about the newer digital type ones.

Then I tested it on the battery that was on this car. It was still holding voltage, but under load (allow a 10 second short through the heating element), the voltage dropped to 8 volts, which is officially declared as bad

I have another battery coming, but not quite of the same rating as the Bosch. 70Ah and 680CCA, which is what is on all the other 9-5's and agrees with the spec in WIS

For now, I'll leave the current battery in situ and the new spare will sit on the shelf. You never know when you will need one

The Bosch will probably be fine for starting a car in good health, so it may sit around for a while until my next weigh in.

15
New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project
« on: 24 March 2024, 11:39:17 AM »
The sump has been cleaned & is ready for reassembly

The best news is that there was no sign of metal in the sump, so I'm not going to bother disturbing the bearing caps

Compared to the OG 9-5 the oil pickup is tiny, nothing blocking that either, apart from a small amount of sealant residue. That remained flexible, in line with the comments in WIS, so I'll probably use the RTV I bought as a backup alternative yesterday.

I found an onine calculator and a comment that a normal flow rate is 8-11 gall/minute https://bobistheoilguy.com/forums/threads/oil-pump-flow-rates.118392/ and https://goodcalculators.com/flow-rate-calculator/

With an assumed flow rate of 2 m/s (no idea whether that is a realistic estimate), the OE spec would be 11.1 gall/min whilst the engineered part would be 8.2 gall/min. At least I have a scaling factor to consider. I'm unable to find anything on flow rates online, so the ultimate question is how much excess capacity does the standard pickup tube have.

I'm confident that there will not be a problem at idle, as the demand for oil is much lower, it's going to be at the higher rev range where the requirement is higher. I have something else to do now so I'll reassemble the sump and then have a ponder. Ultimately, if I go the engineered route, I can always see if I can measure the oil pressure with a gauge, but I'll need to find any potential measurement point, connection type and get the connection union fixed first as it leaks  ::)


Pages: [1] 2 3 ... 74