V70 D5 Just cleaned out my EGR mixer pipe - jesus!!

[Speedy]

By blocking off the EGR though aren't you just moving the potential sludge elsewhere?, where perhaps you can't clean it out.

[Bernard333]

With the EGR blanked off everything should go out the exhaust as it will mainly be a hot gas and there will be no sludge , whats happening in the plennum is some of the gas condensing due to the cold surface and the carbon particles binding with water and engine oil vapour making the sludge . I think most of the sludge is being made during warm up stage and when the valve is open due to hard driving or heavy load on the engine , at a steady 50 mph it should stay closed most of the time , thats my theory for today , anybody know for sure whats really happening in there ? Would be interesting to see inside a duff catalytic convertor from a D5 after 100k miles .

[Dynosaur]

Yes, crankcase oil vapour's sucked into the induction tract and on reaching the junction of the EGR cooler, mixes with soot from the recirc'd exhaust gases to form carcinogenic sludge (not to be confused with marmite).
No water required, it just sticks to the sidewalls and slides back down to the cooler outlet.

Blanking off only stops exhaust gas (and so, soot) from re-entering the induction tract.
Your EGR cooler will stay as clean or as dirty as it was when it was blanked off.

[waal70]

After all these posts, curiousity dictates an inspection on my 2002 D5. I'll be sure to prepare some gloves...
However, while not wanting to sound like an environment-fanboi, how did you lot dispose of all the soot and the oily remnants?
Is it something I can use the kitchen sink for, or will that get me into troubles - with either the wife or the city council (after I've clogged up the system with my D5-soot)?

Cheers

[Dynosaur]

Originally Posted by waal70

After all these posts, curiousity dictates an inspection on my 2002 D5. I'll be sure to prepare some gloves...
However, while not wanting to sound like an environment-fanboi, how did you lot dispose of all the soot and the oily remnants?
Is it something I can use the kitchen sink for, or will that get me into troubles - with either the wife or the city council (after I've clogged up the system with my D5-soot)?

Cheers

Go to Yell.com and type in "EGR sludge-disposal specialists"

[Bernard333]

We have a coal fire , I am not suggesting burning it but the sludge does resemble coal tar and I wonder which is the most carcinogenic as coal burning can produce some really nasty gases at the right temperature , there was a privately run incinerator near a place I lived in Scotland once which turned the local cows bright yellow and orange with dioxin poisoning because they didnt have the knob on the correct setting .

[chieftiff]

Dave,

In answer to your question about the fuel pipes. Don't start the job straight after driving and put a rag around the area as you loosen each pipe. You don't get much fuel out. On re-connecting just make sure the pipes are seated nicely by hand tightening and wiggling each one before final tightening. You need some instant gasket when replacing the plenumn. The Haynes manual is good. As I said I did mine 60k ago and had no fuel leaks or black sludge since.

Dave

[waal70]

Did the search on yell.com. It came back with no results found - try feeding it to a dinosaur

[dave_s13]

Originally Posted by waal70

After all these posts, curiousity dictates an inspection on my 2002 D5. I'll be sure to prepare some gloves...
However, while not wanting to sound like an environment-fanboi, how did you lot dispose of all the soot and the oily remnants?
Is it something I can use the kitchen sink for, or will that get me into troubles - with either the wife or the city council (after I've clogged up the system with my D5-soot)?

Cheers

Given there is a damaged oil pipeline somewhere in the atlantic ocean threatening to kill off the coastal area of Louisiana at a rate of 5k barrels a day (or something???) I wouldn't really worry about a bit of sludgy stuff

FFS though, if you value your life/wife don't use the kitchen sink!!

A whole roll of kitchen roll, carb cleaner, rubber gloves. Clean it all out over a wheelie bin and dump in there as you go along.

[Andy]

Originally Posted by dave_s13

A whole roll of kitchen roll, carb cleaner, rubber gloves. Clean it all out over a wheelie bin and dump in there as you go along.

My 'I did it in the kitchen sink' was partially true but once I'd started I did move outside to do the exact above procedure- unfortunately the bin and wall are now splattered with black gunk. I can't win.

And this is definitely a 'double' latex glove procedure as the carb cleaner/oily gunk did a good job of eating my hands.