Hello everyone,
I'm having a problem with my Defender 2006 TD5 and I thought you can help me.
I've been noticing some black smoke when hard accelerating. black smoke is more before the turbo kicks in. Thought it might be a boost leak in the pipes, but after testing each part one by one, no luck finding any leak on the intake. it's holding up the pressure nicely. (from turbo to intake manifold) Then I decided to put pressure (5psi) on the whole system including the engine.
there is a noticeable hissing sound, seemingly originating from the rocker cover. To confirm this, I removed the oil cap and the sound became more apparent, I removed the rocker cover and I found the hissing sound coming from the 4th or 5th pistons (maybe both).
Worth to mention:
There are no signs of oil and water mixing, and no blue or white smoke. The oil and water remain clean.
I have blanked the EGR to eliminate any related potential issues.
I have attached a video, you can see it is louder around 4th and 5th.
Does anyone have any idea about where the problem is, and potential solutions?
Thanks.
IMG_4285 (2).mp4
