2004 discovery 2 td5 oil level rising

Kaijun · Jul 4, 2018

Today, I am going to do MOT for my landy. I found the engine oil level is about 15 mm above the full scale. I didn't see any change in coolant tank. I suspect if diesel is
leaking in the engine. I don't see or smell any thing unusual. How to detect diesel leaking? or other problem? How action do I need to take now? Thanks!

triggersbroom · Jul 4, 2018

Kaijun said:
Today, I am going to do MOT for my landy. I found the engine oil level is about 15 mm above the full scale. I didn't see any change in coolant tank. I suspect if diesel is
leaking in the engine. I don't see or smell any thing unusual. How to detect diesel leaking? or other problem? How action do I need to take now? Thanks!

Hello I'd try getting injector seals and washers done first and monitor oil level after

Kaijun · Jul 4, 2018

triggersbroom said:
Hello I'd try getting injector seals and washers done first and monitor oil level after

Thanks! How do I know which injector seal and washer are fault?

jamesmartin · Jul 4, 2018

Kaijun said:
Thanks! How do I know which injector seal and washer are fault?

just change all and use genuine,if it carries on raising the level on the stick you will need another head,which is what i had to do after o rings and washers didnt cure it

Kaijun · Jul 4, 2018

Are you sure it is faulty injector seal or wash? Any simple way to pinpoint the problem? I have looked at http://www.discovery2.co.uk/Injector Seals.html, I need to rotate engine to right position and no idea of how complicated.

triggersbroom · Jul 4, 2018

Unfortunately its one of two faults
seals and washers letting diesel past change the lot no special tools required
or its a crack in one of the injector towers which is a fresh cylinder head
some good write ups on changing seals and washers on here
Depends on your skill level it's not to taxing a job about 2 hours

Whistler · Jul 5, 2018

triggersbroom said:
Unfortunately its one of two faults
seals and washers letting diesel past change the lot no special tools required
or its a crack in one of the injector towers which is a fresh cylinder head
some good write ups on changing seals and washers on here
Depends on your skill level it's not to taxing a job about 2 hours

I can vouch for this, changing the seals is not too difficult but you will need the correct tool/s for removing the fan, and improvise something to CAREFULLY lever out the injectors. I tried the "half a pipe wrench" method but my pipe wrench was obviously the wrong shape. I eventually stripped an old adjustable wrench which fitted perfectly. The instruction to set the engine at TDC seemed a bit OTT - you are not messing with the valve timing, and removing the rocker shaft lets the valves retract into the head anyway. Then you have to rotate the crank as you remove each injector so the injectors clear the cam lobes (in some cases) anyway. I'm sure someone will correct me, but I could not see the point of setting TDC in the first place.
My 2004 TD5 was dragging air into the fuel system (prolonged screeching noise when you turned the ignition on as the pump passed the air) that I could initially purge but then came back immediately the engine was put under load. So mine would stall and not start again after about 1/4 mile driving. But I also noticed the oil level had risen 5mm or so over the high mark, hence I was pretty sure the seals were at fault. Seals replaced, oil changed and (fingers crossed) all seems OK again.

Kaijun · Jul 5, 2018

good advice! Any simple or non-professional tools to remove the injectors are available?

jamesmartin · Jul 5, 2018

Kaijun said:
good advice! Any simple or non-professional tools to remove the injectors are available?

a little heel bar is what i use

Kaijun · Jul 5, 2018

Out of the topic, My rear camshaft seal is leaking as well. On top of this work, how possible and difficult to do more to push the rear seal out from the inside of the engine?

jamesmartin · Jul 5, 2018

Kaijun said:
Out of the topic, My rear camshaft seal is leaking as well. On top of this work, how possible and difficult to do more to push the rear seal out from the inside of the engine?

you cant it bolts on the back of engine, its part of its own housing,often the oil coming from bottom of bell housing is from other sources ie rocker cover gasket

Kaijun · Jul 5, 2018

how far to reach the rear camshaft by undoing a part of the engine head? I attach a pic from somewhere else

Whistler · Jul 6, 2018

Are you absolutely sure its the rear camshaft oil seal ? Have you removed the engine cover and the smaller cover bolted to the back of the head ? Its the only way to check properly. Mine was dripping oil there but it turned out to be the rocker cover gasket, the half moon bit right at the back.

Kaijun · Jul 7, 2018

I changed the gasket 3 years ago. I feel the bottom of rear camshaft seal, there is a bit oil. The half moon seems okay.

Kaijun · Jul 10, 2018

I have removed the injector heads. They don't seem to have crack. If you got cracked head, please let me know where crack could be. I would like to check any potential or hidden cracks, Thanks!

jamesmartin · Jul 10, 2018

Kaijun said:
I have removed the injector heads. They don't seem to have crack. If you got cracked head, please let me know where crack could be. I would like to check any potential or hidden cracks, Thanks!

i couldnt find any evidence of cracks only symptoms still persisted after seal change so another head once fitted did cure it

Kaijun · Jul 10, 2018

you tried the injector heads one by one? or any quick way to identity fault injector?

jamesmartin · Jul 10, 2018

Kaijun said:
you tried the injector heads one by one? or any quick way to identity fault injector?

its not a faulty injector , a poor o ring will let diesel flow from cylinder head gallery to rocker box then to sump, a poor washer will let gasses into fuel gallery causing poor starting and eventual stalling once too bad, the head can crack letting fuel from the gallery reaching sump, i couldnt find the crack,but since o rings didnt cure it cylinder head was the only other cause left for rising oil level

Discodevon · Jul 10, 2018

Take off the rocker cover without touching anything else, and then do the purge procedure and keep a careful eye on each injectors and see if you can see diesel weeping somewhere

Kaijun · Jul 13, 2018

Unfortunately I damaged the adjuster by tightening screw of the second injector and left remaining part inside for test. After I start running the engine for 10 seconds, I found some liquid out from the green cap. I am not sure if this is caused by broken adjuster or faulty injector. I suppose the broken adjuster doesn't affect short test, I need to replace it later. I have sucked about one 1L engine oil so that the oil level is under full mark.

2004 discovery 2 td5 oil level rising

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