THP (1.6L T) Engine Inlet Decoking/Walnut Blasting

Yep. Inlet manifold off, a very skinny scraper, a mirror, and the softening spray the peugeot dealers expensively supply. All day job.

Dealers have a tool to make it a little easier for them, but not for your pocket. A good ex-dealer like Continental at Punchbowl would have that gear too. They run as an independent workshop now.

I would guess that all of the independent Pug/Cit specialist mechanics in town have done it several times by now. Where in Sydney are you?

One tricky part is the location by feel alone of all the fixings and connections hidden back there.
 
I guess all this is caused by a lot of puddling in heavy traffic, short trips, never warming up properly
and using cheap fuel.....am I wrong?
Our new Renault Captur 1.2 ltr Turbo is a 'direct injected' engine so, I guess it's a good candidate
for this sort of problem down the track?
The use of good quality 95 ron fuel and a can of Nulon Complete Fuel System cleaner every couple of months
would help reduce this problem....or would this be ineffective with direct injected engines?
 
The problem is oil vapour burns on the hot inlet valves because there is no petrol stream to wash it away as the injectors are elsewhere. The black "ash" build-up is remarkably adhesive. The sources include engine blow-by and turbo bearings. You can ameliorate it with dissolving sprays and low ash lubricants, and even catch cans, but with enough time it will eventually get you. The partially blocked inlet leads to air/fuel ratio errors.

Your choice of petrol will not alter the conditions at the inlet ports.
 
Thanks seasink....just the sort of info I need to convince
my wife to give Renne an 'Italian Tuneup' occasionally ;o)=)
The car has been changed to Penrite HPR-5 full synthetic oil
which should do the job hopefully.
Petrol, we only use Caltex Vortex 95 at $1.73 a friggin' litre!
I'm going to have a discussion with the head tech at Buckby's
in Launceston on our next trip up (160klm east) to see what they
reckon is the best course of action to keep any problems to a minimum.
I have never seen such a rats nest of hoses and pipes that completely
obscure the motor in the Captur!
 
The Italian tune-up won't splash any more fuel on the valve inlet sides, so that won't work. It might even increase crankcase vapour venting.

PSA are now suggesting that owners of their 1.6 THP use very low ash ACEA C2 grade oil as recommended for diesels. Penrite HPR-5 is ACEA A3/B4 spec. Its sulphated ash content is 1.28%, compared to the Total diesel lubricant at about half that. I don't know if Renault has a similar idea.
 
seasink said:
Yep. Inlet manifold off, a very skinny scraper, a mirror, and the softening spray the peugeot dealers expensively supply. All day job.

Dealers have a tool to make it a little easier for them, but not for your pocket. A good ex-dealer like Continental at Punchbowl would have that gear too. They run as an independent workshop now.

I would guess that all of the independent Pug/Cit specialist mechanics in town have done it several times by now. Where in Sydney are you?
Click to expand...

I'm located near Hornsby, but happy to drive around the metro region of Sydney to get good service. I would prefer media blasting as I believe that will result in a more effective clean than someone scraping it by hand.
 
seasink said:
The Italian tune-up won't splash any more fuel on the valve inlet sides, so that won't work. It might even increase crankcase vapour venting.

PSA are now suggesting that owners of their 1.6 THP use very low ash ACEA C2 grade oil as recommended for diesels. Penrite HPR-5 is ACEA A3/B4 spec. Its sulphated ash content is 1.28%, compared to the Total diesel lubricant at about half that. I don't know if Renault has a similar idea.
Click to expand...

Very interesting....it seems I shall need to do more research and contact Penrite's tech dept.
Renault's vehicles arrive in Australia filled with Elf products.
If Penrite can't supply a compatible lubricant, it looks like I shall have to stay with Elf
much to my dislike as i want to continue using Penrite products as i have in all my vehicles for the last 25 years.
 
Penrite put out full synthetic Enviro+ C2 0w-30 with 0.8% ash. It may be worth looking into for suitability in the Renault. It complies with ACEA A5/B5
 
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