Turbo/intercooler servicing.

[Alacrity]

I am, during a quiet spell here, trying to find the cause of my poor fuel consumption (22.5 mpg max with steady driving) & have pulled off the inlet manifold, intercooler & all the pipework. The insides of everything is very very wet with engine oil, is this normal or have I got a turbo with shot seals? It doesn't seem correct to me.

If it is the blower anyone got a known good one or knows where I can get a repair kit for it? Do we know the make/model of it?

I will be blocking off the EGR on re-assembly.

[Northern Bongolow]

hi as the rocker breather recircs into this line at the back of the head,ive noted that the biggest factor in the gunk is the oil type and grade.
the egr is said to give problems in this area,but both of mine are relativly clean and are not blanked off.
i have found that the intercooler pipework must be in good condition and all clips tight to give a good pull through the system to the inlet manifold, if not the hot oil vapors cool and condense in the pipework.
this may be made worse by an engine that has poor rings, or valve seals, or the turbo is a little down. does it use much engine oil normally.

[missfixit70]

The rocker cover breather goes into the inlet side of the air intake pipework, could well be down to this? This issue is something I've mentioned a few times in the past. I did fit an oil trap jobby (can't remember the proper name) in the breather pipe, but in nearly a year of use it hasn't collected anythnig, but I don't know if tha's down to the new head being fitted last year? I haven't checked the intercooler/pipework since it was fitted either.

Too slow

[Northern Bongolow]

[quote="missfixit70"] I did fit an oil trap jobby (can't remember the proper name) in the breather pipe,

is it an oil vapour catch tank, it allows the oil vapours to cool and condense back to a liquid and be drained off later.

[alant54]

I did fit an oil trap jobby (can't remember the proper name) in the breather pipe,

is it an oil vapour catch tank, it allows the oil vapours to cool and condense back to a liquid and be drained off later.

I prefer the term...oil trap jobby....it's in a language I understand...technical terms are ok for the more technically minded...

It's like my current occupation as a hygiene maintenance technician....or in English...a cleaner.... .......could have been engineer but I don't have the NVQ's to qualify....

Alan

[jaylee]

I changed over the inter-cooler on mine a few months back after my run in with a fox damaged some of the fins...

This is the second air scoop i've fitted in 4 years too.. (Freak flooding ripped the first one off.) The first air-scoop came with the inter-cooler so it was sitting in my garage anyway..
A used inter cooler alone can go from between 35 to 55 quid..! That don't even include post..
I figure i got a pretty good deal back then, when the vendor wouldn't sell separate the air scoop after negotiation & decided on the two for 36 including the post & all the fitting bolts! An air scoop alone is can be about 30..


Anyway, thanks to Ady pointing out no coolant runs through the inter-cooler. I decided on reverse engineering & jumped in my inspection pit to change it over while i was doing the scoop... (It was surprisingly a cleaner job than some of the electrical work i've done.)

I did notice one tiny spot of oil in the inter-cooler i removed on the left hand side, bottom of the big bore pipe... The rest was really clean alloy? (A lot cleaner than the air intake to the cab i cleaned out.)

My van runs at about 25.5/26.5 mpg? & that was with a diesel pump seal leak... (Since fixed too, but haven't done Fuelly thing recently!)

[missfixit70]

I did fit an oil trap jobby (can't remember the proper name) in the breather pipe,

is it an oil vapour catch tank, it allows the oil vapours to cool and condense back to a liquid and be drained off later.

That's the kiddy, please excuse my brainfarts, getting old

[jaylee]

Wouldn't oil have to get pretty damn hot to vaporize??

[missfixit70]

Mist is probably more of an appropriate term

[jaylee]

Mist is probably more of an appropriate term

I'd like to be, but i got a shift to cover tonight!

Sorry.. I did a bit of looking up.. Slap my wrist! You know me i normally stay out of this sort of talk... But i do lurk...

[jaylee]

I'm gonna be a pain in the arse now... "misting" "121 degrees C depending on the type of oil"?? Does that indicate a previous or occurring over heat?

[Northern Bongolow]

Wouldn't oil have to get pretty damn hot to vaporize??

its the displaced air in the lower crankcase(under the pistons) and rocker top that is caught and as these areas contain very hot oil there is likely to be some in the air, this is pushed into the inlet system and burnt.
in the good old days this used to get pushed out of a pipe under the car,and out to atmosphere, but the greenies stopped that.

[jaylee]

Thanks for that Ady..! I thought i might have stumbled on another "symptom" to help boost paranoia...



I'll get my works jacket!

[Northern Bongolow]

[quote="Northern Bongolow"]hi as the rocker breather recircs into this line at the back of the head,ive noted that the biggest factor in the gunk is the oil type and grade.

it is all part of the same issue jamie,removing heat from the engine,and how it breathes.

[teenmal]

Hi Alacrity,

Do you have any back pressure/gassing when you take the oil cap of whilst the engine is running.

Cheers.