Oil Light

[J.D.]

My 200Tdi recently unwound a tappet and started backfiring through the snorkel, I fixed that and all is running fine, except...

The oil light comes on at low revs, and sometimes stays on for long periods of time, there is no knocking coming from the engine as if the oil pressure was low though. The oil sensor has been replaced and the vehicle has had a full oil change approx 800 miles ago. Any ideas on the problem.

Previous to snapping a tappet screw, it did occasionally put the oil light on at higher engine temperature on idle, which I put down to thin oil as it was so hot, at higher revs it went out ocmpletely though in the past.

Any ideas would be welcomed.

[DoubleTop]

good news that the engine is back and running mate

That sounds suspiciously like a worn oil pump, not providing the oil system enough pressure at low revs.  I don't know enough about the tolerance on the oil light being a 'warning' light and if that being illuminated means that you would hear any knocking.  The fact that at higher rpm it goes off, it's got to be very close, so it could be first signs of a failing oil pump.

With the insider knowledge of a lot of fuel being used, I also wonder about the fuel pump pressure if your fuel lines do have a leak ...

DT.

[J.D.]

good news that the engine is back and running mate

That sounds suspiciously like a worn oil pump, not providing the oil system enough pressure at low revs.  I don't know enough about the tolerance on the oil light being a 'warning' light and if that being illuminated means that you would hear any knocking.  The fact that at higher rpm it goes off, it's got to be very close, so it could be first signs of a failing oil pump.

With the insider knowledge of a lot of fuel being used, I also wonder about the fuel pump pressure if your fuel lines do have a leak ...

DT.

Its always had reguar oi changes though, and sometimes the light goes out, sometimes it doesnt, so im wondering if it is the pressure sensor. Found the fuel problem - bleed screw on the filter was loose!

[GreedyGibson]

I dunked my engine and got sandy water in the oil. My oil light came on when it was hot but i did run it for another 4 months like this and it was only slightly noisier but would over heat if used on long journeys. I tried a new pump and replaced the cranck shells but my crank was fubar.

You can get a nice thick oil from fiat called HPX which is 30/50 which may help if the pump doesnt sort it but i would try a pump first.

[J.D.]

Funny you should say that, my temp gauge goes over the hafway, nearly to the 3/4 mark on the motorway.

[matt_walker31289]

as i told you i had this happen on my truck,

got lazy and didnt chainge the oil for 8000 miles when i did it came out thick and black.

then on tick over after 400 miles of doing the oil chinge the oil light would come on, but you could get over it by picking up the reves.

took it to a garage when it came on on the A38 doing high reves at 65mph and he said it was a bad pump.

hope it is of some help.

[Range Rover Blues]

Funny you should say that, my temp gauge goes over the hafway, nearly to the 3/4 mark on the motorway.

Sounds like a dodgy radiator

[J.D.]

Funny you should say that, my temp gauge goes over the hafway, nearly to the 3/4 mark on the motorway.

Sounds like a dodgy radiator

Yep, but rads are the one thing I don't have at the moment, need to break a 200 or 300 with a good rad and grab one out of that.

[bilge rat]

hope this helps but the 200 should have a 82 stat in but most seem to have a 88 in , this slightly higher water temp then not cooling the oil so much as it passes through the oil cooler . the other thing is there is a thermostat for the oil cooler which is located in the oil filter housing. not dear to change . i had a similar prob with my 200 but was only when towing and getting really warm . wouldnt have thought it would be a prob in todays temps but you never know. what grade of oil are you running on  ?. iff your sure your oil pressure switch is working properly ,check the wiring and make sure its not going to earth any where ,  alan..