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It recently had a new, genuine, oil pump fitted by a local Land Rover Specialist. Cutting a long story short, when they put it back together, their mechanic left off the oil cooler adapter (apparently he thought it was part of the old pump), so the oil filter was attached directly to the pump and the oil cooler was disconnected. When the car was started from cold the oil light went out immediately, happy days, or so we thought! When the error was discovered, the Land Rover Specialist found the adapter and re fitted it with apologies. However, with the oil cooler re connected, the oil light now takes 15 - 20 seconds to go out on start up.
It’s been suggested that the cooler pipes have been connected ‘the wrong way round’, changing the direction of flow and that the oil is draining back out of the cooler, but I can’t find any diagrams online showing the correct connections, both at the adapter and oil cooler, or the direction of oil flow.
I’ve contacted JLR, but they tell me my vehicle is too old to be on their system, and everywhere else, including the local Land Rover Specialist, appears to be shut down due to Covid 19.
If anyone has any diagrams / photographs / images / charts / suggestions, I would be most grateful for any assistance.
I don't have any direct experience with your engine however it's typically difficult to reconnect lines like these the wrong way round. Under most circumstances they will only reach to be fitted one way, and one way only. I'm also of the opinion that simply not having a cooler wouldn't impact your oil pressure after reconnecting it. Having low pressure with it now would not necessarily mean that something went wrong when it was disconnected, if that was your angle. The obvious suggestion is to remove the adapter and run the filter straight up against the cover again the check the behavior of the light for a quick analysis. I assume there are no leaks or other issues with this setup and you're simply eliminating the lines and cooler. However, you really need to hook up an oil pressure gauge so you can measure what's going on and get to a definitive conclusion of the problem. What caused you to have the pump changed? Were you experiencing low pressure previously? Perhaps your cooler is compromised and your mechanic inadvertently did you a favor by discovering that for you!
Thank you for your response.
It would appear that at least one of the pipes currently fitted is the wrong one, see image below.
In the workshop manual, it advises that, when removing the adapter ring, you should mark its position, the implication being that its position is important, but it doesn’t tell you what that position should be, or why.
I was also advised that the oil flow direction (see image) should be to the top of the oil cooler, not the bottom, which would explain why the oil filter has a non return valve to stop the oil draining back into the sump. If the feed were to the bottom, as the diagram suggests, the filter could not act as a non return?
My apologies if I’m missing something here, or the advice I’ve previously been given is wrong, but as I said in the original post, I can’t find any diagram showing the oil flow direction.
I did say, ‘cutting a long story short’!!
Flow direction advice - that the feed to the cooler should go to the top, not the bottom Current configuration, with the wrong pipes
Grateful for the diagram OverRover, but I have a question if you don’t mind?
I’m told that there is a ‘non return’ valve / function in the oil filter to stop the oil draining back into the sump. If that is the case, and the return is from the top oil cooler connection to the oil filter, then the only oil that could drain back would be whatever was in the top pipe, is that correct?
It would seem to make more sense if the pipes were connected the other way, with the filter return from the bottom.
Can I make that 2 questions? There are 2 Oil cooler adapter rings listed for the Range Rover under part numbers ERC8501 & ERR2490. I believe the latter is the correct one for a 1994 but is not longer available’. From the images I’ve seen, I cannot see any difference, but I don’t know which one is fitted to my vehicle. If I have the wrong one, could this be causing or contributing to the issue at hand?
Oil Light
