Oil pressure light - again!!!!

Post by **belgianbill** » 24 Dec 2007, 18:00

Thanks for the previous posts but.......

Brand new complete cylinder head including valves, guides, injectors, reconditioned turbo, brand new low pressure oil switch, sump off and brand new oil pump. Mains and big ends all look OK, bottom end nice and tight.

BUT still got the perishin' oil pressure light on at idle when oil at normal operating temperature

. Slight throttle pressure and it behaves itself and goes out and stays out. No problems before head was replaced, but old head was badly cracked.

Any bright ideas out there????

1600TD JX engine

Post by **airhead** » 24 Dec 2007, 18:15

Have you tried cleaning your earthing points behind the dash? It might not be an oil pressure problem at all.

Post by **andysimpson** » 24 Dec 2007, 18:41

Have you tested the pressure and what was it.

Post by **lloyd** » 25 Dec 2007, 08:32

What Andy said. Do a physical test with an oil pressure gauge and see what it really is.

Post by **belgianbill** » 25 Dec 2007, 15:16

Thanks guys. Back to the drawing board. But if the pressure really is low at idle whats causing it? Partially blocked oilways in the new head? Obviously the pressure is now higher in the engine after the head job so the pump isnt keeping up at idle - very strange. And only when the oil is hot. No probs until around 7-8 miles of driving.

Post by **andysimpson** » 25 Dec 2007, 19:54

belgianbill wrote:Thanks guys. Back to the drawing board. But if the pressure really is low at idle whats causing it? Partially blocked oilways in the new head? Obviously the pressure is now higher in the engine after the head job so the pump isnt keeping up at idle - very strange. And only when the oil is hot. No probs until around 7-8 miles of driving.

Oil could be getting too hot, idle could be to slow. Oil pressure at the head is always low even on a good engine.

Post by **belgianbill** » 26 Dec 2007, 21:54

Thanks for the replies.
Dipped the oil today, using a drop and can smell oil in the exhaust so it looks like its a bottom end job!

No doubt it will be right one day!

Post by **lloyd** » 27 Dec 2007, 08:05

Oil in exhaust from bottom end can only be from rings. All other sources of oil in exhaust are from top end; valve/valve guide clearance, valve stem seals, turbo seals, turbo oil return plugged (forcing oil past turbo seals)...low oil pressure/oil light is crank/rod bearing, crank/main bearing, or cam bearing, oil pump wear/clearance issues.

Good Luck!

Post by **kevtherev** » 28 Dec 2007, 22:45

[img:320:480]http://images.thesamba.com/vw/gallery/pix/395432.jpg[/img]

this is a new low pressure warning spring as opposed to an old one