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taazzukcb

Member Since: 30 Aug 2013
Location: Derbyshire
Posts: 663

2004 Defender 110 Td5 DCPU Stornoway Grey

TD5 Crank Pressure

Hi All ...

Been having a few gaskety issues lately. Front Cam seal blew out, now the rocker cover half moon has gone again (3rd or 4th gasket in 15 months).

I run an Allard Oil Catch can and filter, then directed to the normal PCV valve.

I get a constant mist through the outlet for the PCV, or if I take the filler cap off, I also get a mist.

There's enough pressure to 'pop' the filler cap off if I unscrew very slowely! I put a vent to atmosphere filter on the rocker cover outlet and went for a short run, got back and whilst there was no visible drip, there was plenty of mist!

I did a compression test on all 5 cylinders before the refurb injectors and VNT went on and all seemed reasonably ok, but I've had this concern for a while.

Are there any TD5 crankcase pressure figures if I made up a pressure gauge?

21st Feb 2015 2:28pm

taazzukcb

Member Since: 30 Aug 2013
Location: Derbyshire
Posts: 663

Also to note, the PCV is new. I have no rising oil level to signify injector seals. Just seals popping and my general concern. Just worried if the pressure is in the sump to, I might start popping crank seals.

Also to add, it's had a recent, VNT, IC and strong Map.

21st Feb 2015 2:32pm

GREENI

Member Since: 22 Aug 2010
Location: staffs
Posts: 10383

No luck?

22nd Feb 2015 10:26pm

Steve B

Member Since: 22 May 2009
Location: Warwickshire
Posts: 587

You can measure crankcase pressure but don't blank the hole off, maybe make a 'T' directly after the cam cover exit this should give you an indication of maximum pressure whilst under driving conditions. Maximum load should do it.

Blowby should be measured as a flow rate to determine engine condition, eg; Litres/min plenty of info. on the web how to measure this.

Could your catch can have introduced a restriction creating higher than normal pressures in the engine?

Diesel engines do have higher blowby than petrol and undoubtedly this has increased with the extra tuning you have done.

25th Feb 2015 1:00pm

taazzukcb

Member Since: 30 Aug 2013
Location: Derbyshire
Posts: 663

Fully understand about not blocking it. That would result in major works! I have a couple of various 'T' sections I've used for testing various things so should be able to make something up.

The catch can isn't causing any issues as the same pressure is there with the catch can off and just the cover flowing straight out to atmosphere. Out of the catch can, it goes to the normal (new) PCV, and the pressure coming through the PCV is the same/similar as before the can (and Turbo as they went on together).

Also fully understand that diesels are heavy breathers (this is just more than expected, though I haven't 'felt' another TD5 to gauge the difference). With regards to the tuning, I dont think that would have caused any extra pressure whilst sitting at idle. Could possibly understand it at load however, but not a major difference.

25th Feb 2015 1:52pm

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