So...When my car gets to normal running temperature. The oil pressure light comes on. It only comes on when idiling...Just changed the oil, been checking it regularly and it is full. I read that sometimes the o-ring on the oil-pressure switch goes out, so I ordered a new one that I'll be installing this weekend. Does this sound about right, or should I look into the oil-pump?

i have seen oil pressure relief valves get stuck open before, the other thing to look at is the big end and main bearings, also make sure the pressure is down and its not just the switch playing up

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S3 2.1/4 doosel runnin vegoil just to piss off the anti 4X4 freaks

Where is the oil pressure relief valve exactly? Its on a 4.0

all in the same place lol, its part of the pump housing on the from of the timing cover, my cousins bobtail disco used to stick open if you gave it a clout with a lump of wood and it would sort its self out

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S3 2.1/4 doosel runnin vegoil just to piss off the anti 4X4 freaks

Thanks G-Man...While I've got ya here...Have you ever done a head gasket job on a rover before? mine's blown. Just ordered the top-end rebuild kit today. Looks like it won't be too incredibly difficult(only time will tell) just looking for pointers/tips...Thanks

Hi,

You might want to read V8 Engine Problem

I am going through this one and its a night mare. I have had no choice but fit a new lump in mine. (AGAIN) as I have replaced ever component on the engine and rebuilt the entire thing again and am still getting low oil pressure at tick over.

If you think your switch is okay then as a tip, listen to the engine and when the oil light comes on the top end should start to tap slightly as the followers start to close up.

Hope this helps

Bryan

Was the oil light coming on when cold as well? Don't know if it makes a difference, but mine only comes on when fully warmed up at idle?

Yep,

same as mine. only comes on when engine is warm.

great...I was hoping it would be a quick fix...Still might be. Who knows. What would you recommend checking 1st to see if this is the same problem you had...I'm really hoping its not

Try new switch first. But odds on it's main bearings.