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1

Omega General Help / Re: Mv6 3.0 oily water

« on: 01 February 2023, 11:17:25 »

Would a 3.2 cover work its magic? There are no 2.5 or 3.0 scrapped in Sweden.

2

Omega General Help / Re: Mv6 3.0 oily water

« on: 01 February 2023, 10:46:53 »

And intermittent coolant loss is far more likely to be HBV, and is easily checked visually.

But as you have to change the oil cooler anyway, you'd be radio rental not to change the cover plate.

Top tip when changing the oil cooler - do not bend the pipes.  Do it properly and undo the pipes near the oil filiter.  Bending them will stress them enough to cause them to leak at the oil filter end anyway, and also make them a complete arse to refit.  No need to ask how I know that, after I chose to ignore the good advice here

HBV is brand new (was spraying coolant like a mist), double-check and the engine watery just at the middle of the "v" when leaking.

Yeah Ove had my fair share of ruptured metal pipes.

3

Omega General Help / Re: Mv6 3.0 oily water

« on: 31 January 2023, 23:06:59 »

Binning it means simply put, connecting the two unions together in the middle of the v (or removing and plugging from where the pipes should have been)?

It allways have a purpose, but I also doubt its function on normal drive (also, its ridicolously tiny, wouldnt function as a preheater for wvo-diesel)). Will search to replace it though. Wouldnt be fine finding it overheat at a long road away from home. But first I want it freed from problem.

Great thanks for the replies all. Strangely enough looking forward for some more wrench-friendly weather (longer days, less snow/mud, more sun) so I can start...

Any takers if intermittent leak can be HG? Leak been present for +6 months (of course I realize it can be, but putting it on a counter of probability).

4

Omega General Help / Re: Mv6 3.0 oily water

« on: 31 January 2023, 22:37:52 »

You misunderstood.

1. Failure of the cooler = oil in the coolant

2. Failure of the cover plate = coolant loss
2a. Failure of the head gasket as described = coolant loss
2b. Failure of the HBV = coolant loss.

1 is fixed by replacing the oil cooler (and flushing the cooling system with dishwasher tablets about 26 times.

2. Is not fixed with sealant. But rather replacing the porous aluminium plate with a new one. And maintain it by renewing the correct coolant every four years.

So, yes. New plate and oil cooler. Thanks.

5

Omega General Help / Re: Mv6 3.0 oily water

« on: 31 January 2023, 21:19:43 »

So a cross in the water and chanting ave maria wont fix it? 

Wondering if the weeping water would be intermittent if its the HG (seem unlikely doesnt it?)? Idled for 30 min and took a 10min drive around 1500rpm today just to ... I dont really know. But no lower coolant...

Realise I still most likely have a oil cooler leakage though. Would that mean the heat-exhanger is leaking, or just the sealant leaking (resulting in oily coolant water), i.g. should I prepare to replace the cooler instead of just cleaning it up and replace sealant.

Questions, questions.

6

Omega General Help / Re: Mv6 3.0 oily water

« on: 30 January 2023, 16:07:01 »

You need to find the source of the coolant leak. A mirror on a tick so you can see the rear of the engine can be helpful. Or pressurise with compressed air is even better.
After that, you definitely need a new oil cooler. And then lots and lots of flushing of the cooling system to get rid of the oil from it.

Yes, my plan is to take the plenum+DIS-pack off (to see what's happening), then pressurise, let us pray.

7

Omega General Help / Re: Mv6 3.0 oily water

« on: 30 January 2023, 12:37:25 »

Oh yes

excellent, enough hope to start the process and find out the false hypostasis is a way to go.

8

Omega General Help / Re: Mv6 3.0 oily water

« on: 30 January 2023, 12:21:33 »

Allready changed thermostat, hbv, coils and dis-pack what else woild there be to consider changing?
Genuine VX-dealer gasket or £300 full set for rocker, head, intake with NN brand?

Its pretty much impossible for oil to get into the water via a failed headgasket, its usually the other way round (water in the oil) or water in the bores, or just water leaking.

The basics are that a headgasket has only one high pressure area for oil (to feed oil to the cam bearings and followers) and its very well protected by integrated rings and seals, to get oil into the water jacket would require this high pressure oil feed area to fail and get into the above atmospheric pressure coolant (which it is most of the time).

The one place oil can get into the coolant is the oil cooler 

Awesome answer. So there might be a chance in hell I'm on the wrong track and just need to seal the oil cooker.

Engine (usually) run great, recently it misses a sparks at idle quite random, as said, no watery oil.
Smokey exhaust (humidity 77% & 1°C outside, lovely weather), was way worse when 1st cyl was dead due to DIS-pack died cause corrosion.
Smokey oilcap when hot, dipstick. Not excessive or pressurising. Might be smelly, no idea.
Yeah, and ... draining water quicker than a drunk.

Makes me think of HG, but might just be valve-related and oil cooler being bust, riiight...

Would I be able to spot the leak on HG through pressure-test?

9

Omega General Help / Re: Mv6 3.0 oily water

« on: 29 January 2023, 23:26:56 »

MarkDTM did a pretty detailed post regarding the V6 HG failure.

Basically, when it fails on the Omega it does so in such a way that coolant leaks out of the gasket rather than mixing with oil. When the HG failure gets worse, the failure point allows water into the #6 cylinder but not the oil passages because where the gasket fails first is between the water passage and the back of the engine and, then secondly, between the water passage and the cyinder. This means that it leaks coolant externally as the mode of failure and in to the cylinder only when the engine is running and at no point do the water and oil passages become connected.

This is in contrast to the oil cooler fail which sees the oil pump force oil into the cooler without allowing coolant into the oil, even though this is often misdiagnosed as HG failure.

Once the head comes off, the point of failure will be immediately obvious, at on the back left corner.

You're a champ for the recap, thank you very much. Dreading to pull it apart in a parking lot though, but what can one do...

10

Omega General Help / Re: Mv6 3.0 oily water

« on: 29 January 2023, 20:34:45 »

Got to find another cap for the expansiontank, going to put in a bicycle-valve in it, low budget pressure-tester. Then pull the plenum off, have my doubts it's the HG, but you never know, to be continued... baw

11

Omega General Help / Re: Mv6 3.0 oily water

« on: 29 January 2023, 02:53:44 »

Thanks for the reinforcement of confidence!

Gotta locate the leak for starters.
Went out to the car just now, only to find that it had barfed out the complete expansion tank (above the lower hose) of coolant under itself (within matter of hours while coldstart -> ran for 30 sec), nothing new.
Makes me wonder though, Holds water while just standing, apperantly loses 1L at just turning over. No contamination of water in oil as i've seen.

12

Omega General Help / Re: Mv6 3.0 oily water

« on: 29 January 2023, 00:51:12 »

In which case there's some good news and some bad news.

The good news is that you know what the problem is

The bad news?

Well, you know what the problem is...

Double up the bad news, only got outside parking. On a crossroad, either i fix it (dyi) or I put it aside and wait for a time to place another engine in. Lovely machine except the engine at this moment.

Cant be 100% right now it's the HG though, as I havn't pulled the plenum off, is it wishful thinking?    Hit the jackpot, that's for sure.

Wish I had a workshop, turboboosted saab engine+omega body is win.

13

Omega General Help / Re: Mv6 3.0 oily water

« on: 28 January 2023, 22:51:59 »

Oil cooler failure is typically seen by oil in the coolant[but not the other way round]swapping one is not a particularly difficult job and I believe there's a guide on here in the maintenance section on how to do it.
I understand that some cars[about 1998?] had a problem with head gaskets leaking to the outside of the head/block towards the rear but others would know better about this than me.

Said to the one having a 98 mv6 with leakage at pressure behind the head/block. BAH 

Panic not, that's usually a weep. 

When the HBV fails it will dump coolant as fast as the waterpump can supply it. As you've recently discovered.

Third time's a charm, it's most likely not the HBV as I've allready changed the piece. Checked all hoses and non is wet, while there were liquid around the block/head. Running down the left side of the gearbox.

Started the bastard today and talking about weeps, more smoke than I'm comfortable with was pushing its way out of the exhaust-pipe. Gotta pull the plenum off and have a look before doing any more time with engine on. Anxiety-triggering car right now..

14

Omega General Help / Re: Mv6 3.0 oily water

« on: 28 January 2023, 14:10:12 »

Oil cooler failure is typically seen by oil in the coolant[but not the other way round]swapping one is not a particularly difficult job and I believe there's a guide on here in the maintenance section on how to do it.
I understand that some cars[about 1998?] had a problem with head gaskets leaking to the outside of the head/block towards the rear but others would know better about this than me.

Said to the one having a 98 mv6 with leakage at pressure behind the head/block. BAH 

15

Newbie Welcome Area / Re: Hi from Sweden! Newbie member - longtime owner

« on: 28 January 2023, 00:10:30 »

We live in the same county, three omegas in the next door kommun, kul.