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Renault laguna 2.2 dci 52 reg - Smoky diesel - maintenanceman
I have a renualt Laguna estate, 2.2 dci diesel on a 52 plate.
£ weeks ago i put about a gallon of petrol into a half full tank of diesel. I did';t start the car and it was pushed round to a garage who emptied the tank by removing the pump from the tank.
£ weeks on from that it has started with a light puff of smoke. Now, suddenly, it plumes out masses of smoke. I mean it will fill the street. Yesterday I was looking at it with my brother who suggested keeping at arounfd1500 revs for a bit. Suddenly the revs took off, I took my foot off immediately, revs still climbing to about 3500 so stopped the engine with the on/off button. Lots of soot on the floor at the exhaust. the EGR valve was changed a 3 months ago and oil checked about 3 weeks ago. Any ideas as to what it could be?
Renault laguna 2.2 dci 52 reg - Smoky diesel - Peter.N.
What olour is the smoke?
Renault laguna 2.2 dci 52 reg - Smoky diesel - maintenanceman
It's a blue smoke.

Edited by maintenanceman on 21/07/2012 at 22:06

Renault laguna 2.2 dci 52 reg - Smoky diesel - maintenanceman
It's blue smoke.
Renault laguna 2.2 dci 52 reg - Smoky diesel - unthrottled

Sounds like it is running on its engine oil. I could be wrong, but I think that engine has a problem with the intake manifold that can crack and allow oil to work its way into the cylinders.

Renault laguna 2.2 dci 52 reg - Smoky diesel - Fernando P

More research on what you have reported, will lead you on to turbo charger "bearing" wear problems caused, generally, by an insufficient flow of oil to them. In the case of the above engine, by not using the right type of oil and leaving it in for too long until it becomes too thick. You need to use synthetic 5w/40 (diesel use) oil in this engine and change it <9k mls/1 year period. If you have done otherwise then beware! But if you look after the 2.2Dci as I have described, it will run efficiently for a big mileage. As unthrottled points out, the plastic inlet manifold can also warp causing intake and running problems but consider the TC bearing wear problem first. BTW, do not be tempted to run the engine until you have examined things carefully, as this could wreck it!

Renault laguna 2.2 dci 52 reg - Smoky diesel - maintenanceman

yep most of the research I have done does report the thr Turbo charger. I have also read that there is a mechanical actuator that can stick. Is that a possibility? I havn't run the engine since the last episode. Thanks

Renault laguna 2.2 dci 52 reg - Smoky diesel - Fernando P

The "wastegate" that I believe you are referring to, limits boost pressure by diverting the exhaust gas away from the turbine wheel and is "informed" by a pressure sensitive actuator. There is a metal pipe with a rubber L shaped connector at the rear of the TC and you need to ensure that the rubber connector is intact. But from what you have described, I don't believe that this is the problem area. A test you can do is to remove the large plastic air flow pipe between the bottom of the intercooler and the inlet manifold to check the amount of oil in it. It is normal for the inside to be slightly oily, as the TC shaft bearings float in a spray of oil. But if much oil is found, it means that the TC bearings have worn excessively for the reasons I have described in my last post. You have not set out what mileage the engine has done. If it is high, ie>200k, the bearings could be excessively worn because of the amount of use. Finally, you have not informed us if the engine oil level has been checked and gone down materially.

Renault laguna 2.2 dci 52 reg - Smoky diesel - maintenanceman

The mileage is 139,000. The problem with checking the oil level is that on back of the dipstick it shows full, on the front (face up as when it is removed), it shows at lowest level- on the bottom mark.

Renault laguna 2.2 dci 52 reg - Smoky diesel - Fernando P

The TC should be good at the above mileage, providing the engine has been lubricated/serviced as I have described, which you have not confirmed. The oil level is at "full" when it is at the top of the hatched mark on the bottom side of the dipstick (when extracted), as you have reported. The full level should equate to ~ 5mm down from the top of the mark on t'other side of the dipstick and should be confirmed by 5 circles when the oil level comes on the screen.

Renault laguna 2.2 dci 52 reg - Smoky diesel - maintenanceman
a link that night explain what I mean. Video taken after dipstick has been wiped, by the roadside and after the car has stood for a couple of days.
youtu.be/j-PkgNYSl68. You might not be able to see it but it shows half full on one side, but full on the back side.
Renault laguna 2.2 dci 52 reg - Smoky diesel - Fernando P

I have seen the link where it shows full at the top and t'other side is ~5mm down on the scale but not down to half full. Looks ok to me. You have still not confirmed if the full level appears on the screen when the oil check is requested after the start card has been inserted. As an aside, it seems to me that you can't have checked your oil in the past if you are only working out how to do it now! Could you also have only told part of the story here I wonder?

Renault laguna 2.2 dci 52 reg - Smoky diesel - maintenanceman

There has never been an oli level check light on on startup.In other words on startup the oil level has indicated Ok , on every start. I have relied on the oil check uo being ok. I only doubt the oil dipstick as I am confounded as to why the vehicle is behaving this way now. It has eerted a doubt that I maybe at fault.In the past the oil was checked by the service mechanic. The last oil change was 32 months ago and when I last checked the oil level it read the same on both sides. i belive the extraction of the dipstick draws latent oil which is held inthe dipstick tube as you drag it outand gives a false reading. I belive that the upper face is the true reading.. Another reason why renualts are idiosyncratic and so crap that a basic oil level reading is confusing by design and I wish I never bought this piece of crap.

Renault laguna 2.2 dci 52 reg - Smoky diesel - Fernando P

No oil check "light" comes on but, as you know, an indication of the level ( >5 roundels) comes up on the screen start sequence and when you press the button on the stalk to go through the cycle. The oil level is easy to check and the dipstick is like any other if you understand which side shows the full level, which l can confirm is on the bottom side. I don't recognise your description of Renaults. The engines are actually very good evidenced by the fact that they can keep going for so long without even an annual oil change! But, as I have explained above, they must be lubricated and serviced properly, like any other engine, which is also set out in the handbook. I am afraid that yours appears to be a classic case of excessive TC bearing wear caused by lack of proper lubrication. Best of luck!

Renault laguna 2.2 dci 52 reg - Smoky diesel - madf

The last oil change was 32 months ago

And you wonder why your engine is failing?

Neglecrt.

Renault laguna 2.2 dci 52 reg - Smoky diesel - skidpan
You call yourself maintenanceman and admit not changing the oil for 32 months. No wonder you have a problem, this is way beyond any limit even for modern oils and specially for a turbo diesel where the oil gets highly stressed.

Suggest you stop wasting everyones time and accept has failed through lack of maintenance and that now you need to pay out and fix it or scrap it.
Renault laguna 2.2 dci 52 reg - Smoky diesel - unthrottled

Why is it that little details like 32 month oil change intervals never appear in the OP? Well, that's that little problem cleared up.

Renault laguna 2.2 dci 52 reg - Smoky diesel - glowplug

Beyond belief. Is this how forums fill up with horror stories?

Steve.

Renault laguna 2.2 dci 52 reg - Smoky diesel - maintenanceman

The last oil change was 32 months ago

And you wonder why your engine is failing?

Neglecrt.

No sorry that was a typo.It was meant to say 3 months ago and checked around 3/4 weeks ago. No cheap oil has been used. I think the last lot cost over £60,(1 x 5L and 1x 1 L) just for the oil. Sorry about the rant, I was just upset that now it's scrap.

Edited by maintenanceman on 24/07/2012 at 21:43

Renault laguna 2.2 dci 52 reg - Smoky diesel - spanner dave

Hmm? Blue smoke "knackered engine"?? Petrol mixed with diesel and through natural combustion will mimick that of oil being burnt ie: blue smoke. Diesel on it's own and under normal combustion normally blows out a bit of black and white smoke, it's the natural characteristic of diesels. Unless you've struggled to drive the car a distance and the mileage isn't starship? you should be ok.

If you ever make that mistake again just have a litre of engine oil handy and pop it in the tank. This will dilute the petr/oil mix and keep everything pump wise lubricated. Don't know why everyone knocks the DCI engine? its no worse than Fords TDCi unit, which we see a lot more of in our workshop thesedays. Its all down to using correct oils and reducing the changes to 6k no more. Our works Laguna has done 167k miles on it's original turbo and dmf. Our Traffic van 1.9DCI 134k with no issues at all. 6k changes, and correct grades of oil with the occasional engine flush additive works wonders. Then after 40 years of being a diesel engineer, what do I know.

Renault laguna 2.2 dci 52 reg - Smoky diesel - sam46rossi

hi.just read some of your comments and just joined site.u seem to know your renaults.i have just bought a laguna 2.2 dci estate 2004 with my wifes bingo winnings.1000£.it runs great but has recenty been losing oil thru big seal on cam cover.motorhome seller who sold me car said he had a mechanic put the seal in.anyway after a run to work i find oil dumped on customers drive.i get it over to a garage across road he finds old seal in engine bay but orders new one from renault and silicones that one in.they just tap in he says.anyway that seal pops out on way home leaking oil again so i push it back in.oil is on side of car and back window. and local renault garage says its contaminated brakes.cam belt.etc and say it will be nearly a grand to fix.there is pools of oil around injectors too.no way can afford this so want to try do myself or use a local mechanic.seems like the inlet manifold gasket can cause oil leaks and pressure to blow the seal out?perhaps you can help please.sam in chester.07585507139

Renault laguna 2.2 dci 52 reg - Smoky diesel - Fernando P

You need to ensure that the engine breather pipe, which is push fitted to the top of the inner rocker cover, is not blocked.

Renault laguna 2.2 dci 52 reg - Smoky diesel - sam46rossi

had diesel specialist check my laguna 2.2dci and they said there is major engine work needed like oil gettin past rings to explain oil blow out.but how come it drives so well.twice now when accelerating to motorway speeds injection fault is displayed then lose bit of power.but on normal a roads up to 60 its fine.turbo seems to kick in and acceration ok.i have a rocker gasket and 2nd hand inlet manifold to try as its top of engine where oil leaks.people on here have had gasket go and manifold warp or crack.just worried that injectors have to come out and they can get stuck in head.anyone have tool to borrow or advice please?sam in chester.

 

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