I thought I would share my experience of how quickly these turbos fail. I own a 2002 Laguna 2 1.9 DCI 120, its done 75k miles. About a fortnight ago it developed a louder than normal whistle on boost considering the fragile nature of these turbos I wanted to check it out sooner rather than later. I took the air box to turbo
pipe off and checked for play in the shaft, there was none more than expected. I checked for oil
leaks, none, finally I checked all the pipes to the intercooler a little oil
residue in there but concluded it was probably the intercooler on the way out or a hole in one of the pipes. As a precaution I ordered a turbo
from my engine supplier and associated oil
feed pipes from Renault.
On Friday I was driving home from work and noticed that the whistle became much louder not much longer after that I lost all power and covered all three lanes on both carriageways of the M69 in smoke. I pulled onto the hard shoulder and stalled the car sharpish. The following isn't relevant but I wanted to mention the exceptional service I received from the highways control centre who I spoke to on the motorway emergency phone and as soon as I had replaced the receiver back into the orange box and turned back to face my stricken vehicle the RAC man was already waiting to recover me home, he did a fantastic and super efficient job of it too!
Back to my tale of woe, I stripped off the air box to turbo
pipe with a sense of deja vu. This time it was clear that the turbo
bearings had collapsed. I removed the intercooler pipes draining a good measure of oil
out of the alloy pipe. At this time it is worth removing the sensor out of the black plastic pipe that goes from the intercooler to the inlet manifold. The remainder of the work to get the turbo
off was relatively easy the turbo
is secured by three nuts to the exhaust manifold and three nuts to the catalytic converter, I removed the bolt from the driver's side bracing bar from engine block to cat and two bolts from the passenger's side bracing plate to cat to allow the cat to move to aid removal of the turbo
, the oil
return pipe is a bit fiddly it is secured by two 10mm bolts I removed it working from above the engine it may be easier to get at it from underneath the car, the oil
feed pipe a piece of cake to remove with a spanner. using not much more than a 10mm socket, 10mm spanner, 13mm spanner, 17mm spanner and a 13mm socket, Ratchet and extension bar (and of course brute force and ignorance) the turbo
was off in an hour or so.
With the turbo
removed it was clear the shaft had snapped and the resulting movement had caused the blades on the impeller to crash against the turbo
housing you can also see the engine oil
that has been dragged through the trubo (see pics).
I then had to remove the intercooler to flush out another good measure of oil
. Removing the intercooler involves removal of radiator grille, front bumper (including disconnecting fog lamps and headlight washers), headlights, and front slam panel/cross member. Once you have gained access the air con radiator must be unclipped from the intercooler this is secured with two clips at the bottom and then 'hung' onto the intercooler. With the clips removed it’s just a case of lifting the air con rad off the intercooler. The same operation has to be carried out for the intercooler as it is mounted in the same way to the radiator at this time I also removed the remaining black rubber elbow from the driver's side of the intercooler and the black plastic pipe that goes from the passenger side of the intercooler to inlet manifold. About 2/3rds of the war down the radiator you need to pull out a 'R' clip on each side these hold the radiator into its rubber mountings there is no need to drain and remove the radiator the is enough room to lift it out of its mountings and manoeuvre the intercooler clear of the car (see pic you can see the air con rad, intercooler just behind it and all the work you need to do to get there!). The pool of oil
under the car is what drained out when I removed the alloy pipe.
I flushed out the intercooler using boiling hot soapy water and then ran warm water through it until it ran clear, I also cleaned out all of the other pipes. I did find four chunks of twisted metal in the air box to turbo
plastic pipe presuming these to be part of the impeller vanes. Replacement of all parts is the opposite of removal. Turbo
should arrive in the next day or two, hopeful that I have not done engine damage will keep you posted.