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2003 Discovery 2 SE7
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Discussion Starter · #1 ·
My D2 lost all oil pressure after I started it warm last week (made around 20 psi for a second or so, and then went right to 0. Dash light came on a half second later). Towed it into the garage, and drained the oil. There were no metal sparkles or sludge. I then cut the oil filter open, and it was clean, again with no metal or sludge.
I then dropped the oil pan, and it was also sludge free. The pickup tube was tightly installed, and the screen was completely clear.
I then pulled the front cover, expecting the oil pump to be in pieces (which I thought was strange, given that I put a new one in around 2,000 miles ago), but the oil pump looks basically brand new. I’m at a loss - what else could cause a sudden and complete lack of oil pressure on these engines? Pictures attached in case one of you sees something I don’t.
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I am sure that someone who knows more about this than me will respond - but it sounds more like a problem with the sending unit than an actual oil pressure problem. Will be interested to see how this is resolved. Good luck.
 

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2003 Discovery 2 SE7
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Discussion Starter · #3 ·
It’s an actual oil pressure problem I’m pretty sure. I have a mechanical gauge for that very reason - I don’t trust the idiot light on the dash. My actual gauge dropped to zero, and the dash light came on. In my mind that’s confirmation of an actual problem.
 

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Discussion Starter · #5 ·
That’s basically the only thing I can think of too - I read that there’s a pressure relief valve in there so it doesn’t exceed 50 psi. I’ve read that if it fails it can result in the condition I’m experiencing. I’ll strip the cover completely and have a closer look at it
 

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Discussion Starter · #7 ·
What about a clog at the inlet for the mechanical guage?
I thought the same for about a half second, until the dash light lit up. It’s on a totally different port, meaning my mechanical gauge is fine. I inspected everything to the sure, and sure enough, all of the ports in the front cover are clear and free of debris.
 

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Discussion Starter · #8 ·
Stripped the cover today. It looks fine. The spring is intact, and the ports aren’t clogged. Only thing I can think of is that spring, which feels kinda soft when I pry at it with a screwdriver, but isn’t broken. I’m not sure how tight it’s supposed to be if course.
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2003 Discovery 2 SE7
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Discussion Starter · #9 ·
Ok, I give up. I ordered up a whole new front cover (with the oil pump and pressure valve) as well as a new pickup tube o ring and all necessary gaskets. If all that stuff doesn’t fix it I don’t know what I’m going to do.
 

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2003 Discovery 2 SE7
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Discussion Starter · #10 ·
Installed my new front cover, and the oil pressure is back. Sounds great.
Question - my new cover didn’t come with the oil filter angle adapter, but do I need it? It seems like an oil pressure bottleneck, and the threads on the front cover are the same. I put the filter right on the front cover, and it leaks a little, but the threads and mounting surfaces are the same.
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Discussion Starter · #11 ·
Put the angle adapter on. Oil pressure is the same as far as I can tell. Still leaks. Guess i got a bad filter o ring. I’ll get a new filter and the should take care of it. At least it runs again!
 

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Discussion Starter · #12 ·
The saga continues unfortunately. It did the same thing again - lost oil pressure at idle while hot. Gauge at 0, dash light on. I gave it some gas and it came back up, and then idle pressure settled around 8 psi. Less that it usually makes but something. Revved it again and it came back to the usual 12 or so psi. Slowly dropped to around 8 after a few minutes of idle. If I bring it up to 2k it makes like 42. I don’t get it. Everything is new. Literally everything. I’m at a loss.
 

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Discussion Starter · #13 ·
I was planning on driving it half way across the country tomorrow so any advice is greatly appreciated. Just don’t want to get stranded
 

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Discussion Starter · #14 ·
It made the 900-ish mile drive today, so I guess it’s fine? I have no idea what’s going on with this thing
 

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Discussion Starter · #17 ·
Haha yep. LR ownership is an experience that’s for sure. Sometimes you love it, sometimes you want to jump it into a lake. Right now, things are going quite well (knock on the single piece of “wood” in the entire interior lol)
 

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Discussion Starter · #18 ·
Ok, so it doesn’t like idling. Every time I idle it (hot or cold, doesn’t matter) the oil pressure slowly drops to 0. It then makes crap oil pressure (like 20 at 2k cold) until I get to higher RPM, and then it jumps back up to normal
 
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