Club 80-90 Forums

Just finished rebuilding my JX with brand new cylinder head and recon turbo. On start up all OK but after driving for 7-8 miles from cold the oil pressure warning light flashes on idle - below about 1000 rpm. As soon as the engine revs build the light goes out and stays out. Have replaced the pressure switch in the back of the head (twice) but no joy. Anybody any ideas?
Thanks for a great club guys!

Have you tested whether it is actually low oil pressure? How many miles has the bottom end done? It does sound like it could be worn bearing shells.

Whip the sump off, check the oil pump pick-up gauze isn`t full of cr*p, then it`s down to pulling off a few bearing caps and checking the bearing shells to see if they are worn (copper showing through the white metal), also worth pulling the oil pump down and opening it up to check if its worn as well.

Do`nt want to be running a new turbo with low oil pressure or it won`t last long

Thanks for that - depressing as it might be! I have no history with the engine so no idea how many million miles its done. HOwever it souns sweet when running and pulls well - just this blesed light at low revs when hot!
Back to the drawing board

Try and blag an oil pressure gauge from someone to check if it is actually low, or it`s a dodgy wire or sender.

Yeah will do. What should the pressure be?

belgianbill wrote:Yeah will do. What should the pressure be?

Minimum 2 bar at 2000revs at oil temp of 80 degrees.

Cheers Andy

mine used to flicker[when very hot] at .6 bar [sender on front of cylinder head] would go out when engine cooled.since new big end and main bearings, and new oil pump, the light stays off.

Do not check oil pressure on head, thats always low even on a healthy engine, check on oil filter bracket.