I've got an 89 240 wagon with about 150,000.
The oil light came on recently, the oil level was good.
What I'm looking for is a picure or location of the sensor and wiring to
check for grounding???

Any other info or suggestions would be great.
Thanks

Chapster out
--
Chapster out

You may have low oil pressure, but discount the other things first.

To see if the wire is grounding somewhere in the harness, unplug it at the sender (to the left of the oil filter, with black wire). If the light goes out then wire is not grounding in harness.

If the wire checks out okay, then it may be the sender. If you don't have a pressure tester, buy a replacement/spare sender. They're pretty cheap. (I paid about $11CDN for one from NAPA, "Echlin" make.)

If the light remains on, then probably low oil pressure.
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1980 245 Canadian B21A with SU carb and M46 trans

Here is what can cause an oil light to come on:

1. low oil pressure

2. faulty signal from sending unit ( falsely indicating low pressure)


Check the following.
- make sure you are using either 5W30 or 10W30 grade viscocity oil (I know this sounds wierd but there are people who put 0W20 into their motor). The wrong viscosity will cause low pressure because of the bearing clearances on the crankshaft.

-have you topped off your engine with any old oil? (like any oil sitting on a shelf for more than 3-4 months? Oil does go bad because the additives in it go bad and it doesn't do it's job properly then.

-Check for continuity on your oil sender wire back to the grey terminal box on the firewall or where ever it leads. Like someone mentioned before. The o-ring they are talking about could only dry up if you run low on oil for extended periods of time and just because you have 150K on your motor doesn't mean it is bad. this is most likely not your problem so don't worry about that right now.

-If you have access, install an oil pressure gauge in place of your sender to rule your sender out as a possibility of failure.

Hope this helps!
Chuck in Mpls




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'87 BMW 325e 190K (used to feed a '84 245, '84 244, '85 744)

Check the black wire that is close to the oil filter(attached to the oil sender)for a short to ground.Also with that kind of milage sometimes the o-rings that seal the pick up tube from the oil pump to the block(inside the sump)get brittle,crack and then the pump sucks air and not oil.