Oil Leaks in 300TDi

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Originally Posted by Landy110

So if I take the hose off the tappet cover with the engine running there should not be much air movement from the tappet cover, I am assuming "blowby" relates to combustion gasses passing the valves and ending up in the rocker chamber, is this correct ?

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No, it's blowing past the rings and into the crankcase, then through the breather.

If you had a crook valve you lose combustion pressure either back through the intake or exhaust system, not into the crankcase.
If do a leakdown test you can isolate between ring and valve leakage very easily.

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Originally Posted by isuzurover

A certain filter manufacturer I work with - who made some of the OEM TD5 filters, referred to ALL the engines in the Provent field test as "schnickschanckmotoren". (the test included Tdi / TD5 / 3.9(T)Di). I will let you translate that.


[snip]

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Google translate only filled in the 'bells' and 'motor' bit for me :D

Ben says:

"The Provent won't allow crankcase pressure to get above 50 mBar"

AND

"Yes, correct. At idle/off boost there should be almost no measurable flow/mist coming out the breather."

I says "hells NO"!

Your Provent wont technically stop excessive blowby, it just pops a poopoop valve ;)
and/
A good hardy 300tdi that I know has so much blowby at idle that you can hardly put the oil cap back on... still runs good... still pulls hard and does its own oil changes without needing an oil recycling station. It simply returns the oil to the atmo which then falls to the ground from whence it came ;)

Steve

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Originally Posted by rick130

No, it's blowing past the rings and into the crankcase, then through the breather.

If you had a crook valve you lose combustion pressure either back through the intake or exhaust system, not into the crankcase.
If do a leakdown test you can isolate between ring and valve leakage very easily.

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Thanks for correcting that - I missed the valves part.

As for the translation
http://dict.leo.org/ende?lp=ende&lan...schnickschnack
This is one of those times when the translation doesn't work. The most appropriate would be "toy" or "insignificant"

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Originally Posted by roverrescue

Ben says:

"The Provent won't allow crankcase pressure to get above 50 mBar"

AND

"Yes, correct. At idle/off boost there should be almost no measurable flow/mist coming out the breather."

I says "hells NO"!

Your Provent wont technically stop excessive blowby, it just pops a poopoop valve ;)
and/
A good hardy 300tdi that I know has so much blowby at idle that you can hardly put the oil cap back on... still runs good... still pulls hard and does its own oil changes without needing an oil recycling station. It simply returns the oil to the atmo which then falls to the ground from whence it came ;)

Steve

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:D As mentioned before, your engine is an outlier...

Give the coke canister a bath overnight in kero and then in soapy hot water as it could be choked up causing the rocker cover to leak. Pat

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Originally Posted by Landy110

So the seperator is part of the oil filter assy? I have not pulled this apart so know nothing of it. So if you could give a bit more info I would appreciate it.

I didn't think I would get oil leaking around the injectors but was worried it might indicate a head gasket failure. I will try to better identify the fluid. ( I understand exactly what you are saying )

The gasket on the rocker cover is new and still leaks, I have put a gasket on it with a non-hardenning gasket sealer in the past and it still leaks.

I washed the engine down recently and have been watching it as close as I can hence these specific questions.

But read on as I theorise about something in a few posts from here!

Thanks
Steve

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•G03.055 ENGINE BREATHER (2.5L 300 TDI FROM (V)MA081992)
•SEPARATOR ASSEMBLY-CRANKCASE BREATHER OIL, (-) 12L 2.5 TDI MANUAL - GEMINI, (-) 200 TDI, ALSO SERVICED AS PART OF A KIT
•Part number: ERR1471

https://www.aulro.com/afvb/images/im...012/03/722.jpg

this bit Маслоотделитель (сепаратор) 300TDI X translates to Separator (separator) 300TDI X

I'll leave the theorising on vacuum pump failure to others.

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Originally Posted by PAT303

Give the coke canister a bath overnight in kero and then in soapy hot water as it could be choked up causing the rocker cover to leak. Pat

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Is this the part indcated by "8" in the diagram above ?

And this is all a bit new to me, please define "PROVENT"

This is becoming quite educational, thanks guys.

Steve

Yep,part 8.Also replace pipe part 6. Pat

Quote:

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Originally Posted by Landy110

Is this the part indcated by "8" in the diagram above ?

And this is all a bit new to me, please define "PROVENT"

This is becoming quite educational, thanks guys.

Steve

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this will get you started

PRO VENT 200 CRANKCASE BREATHER PROVENT 4WD | eBay
http://www.aulro.com/afvb/projects-t...-defender.html

Well this has been a very interesting excercise, thanks to all. The provent look quite interesting as I always have traces of oil at the induction hose joints post turbo.

Been a bit pre-occupied with the vacuum pump these last few days though, sounds like it dropped a valve the other day in Lithgow, made a hell of a ticking noise. new one fitted tonight, all good!