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hank



Member Since: 12 Sep 2016
Location: South Wales
Posts: 2300
Wales 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Engine Experts - Advice
Long story short, my 2.4 TDCi has a history of excess crankcase pressure and passing oil via the PCV valve

Over the years I've replaced the injector seals god knows how many times and am pretty confident they're sealing well after cleaning up the head seats but still passing oil out of the PCV valve.

I pulled the inlet manifold and glow plugs to perform a compression test and seem to be getting good compression so I believe the valvetrain and rings to be ok.
1. 370psi
2. 380psi
3. 390psi
4. 390psi

Where else can I look for the source of crankcase pressure? Are there any other breathers that could be blocked? Be it internal or external

I am going to do cylinder 1 and 2 injector seals again then retest compression, but then I'm at a bit of a loss > 110 XS Double Cab
Post #913640 22nd Jul 2021 7:44pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3414
Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
Valve seals perhaps. The intake is at quite a pressure under full boost. The exhaust is also at some pressure, even higher if the cat is a bit blocked.

The valve seals will not be detected neither by a compression test nor by a leak down test. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #913641 22nd Jul 2021 7:51pm
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hank



Member Since: 12 Sep 2016
Location: South Wales
Posts: 2300
Wales 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Ok thanks, I will do some research. Can they be done with the head in situ on this engine? > 110 XS Double Cab
Post #913716 23rd Jul 2021 8:27am
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3414
Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
I do not know for the TDCI, but I have replaced valve seals on other engines with the head in situ. Just make sure that the valves you are working on has the piston at Top Dead Center as once you remove the seal, the valve wants to drop in the cylinder.
You would need a special tool to compress the valve springs... actually nothing very special about these tools as they can be home made from a piece of flat bar. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #913719 23rd Jul 2021 8:34am
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