Hi all,

On the near side of my OM606 engine I can see that there is some sort of sensor in the side of the sump/block, there is an oil leak around that area so I have a feeling that a seal might have gone so I need to replace it.

What sensor is it for me to be able to find the right seal to purchase? I am guessing its something like a low oil sensor or maybe a temperature sensor?

Many thanks

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UK spec Mercedes W210 E300 Turbodiesel wagon - OM606.962 with 722.6 transmission - rust free!

Thats the oil pressure sender I believe (it is on the M103) I would replace it at the same time as the seal since you will need a new seal again if it fails.

Oil level sensor. Next time you change oil remove it and replace the seal. IIRC it is an o-ring type seal.

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Jim

Thanks guys, I figured it was a level sensor of some sort, will see if I can temporarily seal it until I change the oil again, its only a very small leak but still annoying!

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UK spec Mercedes W210 E300 Turbodiesel wagon - OM606.962 with 722.6 transmission - rust free!

I had to replace the Oil sender switch on mine. I just pulled it out off a gasser engine at a Junkyard and put it on. The O-ring was still good so I did not changed it. Pretty simple to do.

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06 MB E320 CDI 123k miles
14 Sienna (wife's DD) 36k miles
11 GL350 Bluetec 136k (Sold)
96 E300; 292k+ miles (Donated)
11 Sprinter 22K+ miles (Sold)

m1tch:

With all respect, left and right are universally understood, however, for many readers the terms "near side" & "off side" will be a bit obscure.

If the point of the leak is in the sump it will be the electric feedthru for the oil level sender; if the leak is in the block it will be from the pressure sender.

I was initially going to be using 'driver side' and 'passenger side' but have refrained from doing so owing to most of the forum members driving LHD cars it might have caused an issue - will just use left and right.

The sensor in question is on the right hand side of the engine when looking at it from the front.

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UK spec Mercedes W210 E300 Turbodiesel wagon - OM606.962 with 722.6 transmission - rust free!

Hence, it is on the left side of the engine/car!!
Now, back to the second question: is the point of the leak in the block or in the sump?

YES! Always give directions from the driver's perspective.

Another good one is "crank" "run" and "start" when referring to an engine's state of operation.

"The engine starts after cranking for 5 seconds but doesn't run."

Sorry, I digress...

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

Usually the leak in the oil-level float switch (located in the oil pan) is because the seal has failed (I vaguely remember is as an o-ring). Replacement is easy but the oil has to be (at least) partially drained so do it next time you pull an oil change.

There have also been reports of oil leaking through the switch. That requires replacing the switch, of course.

Finally, the switches in general appear to be very conservative. The three cars with 60x engines I've owned (two of them currently owned) have all tripped the warning light when the oil is about 1 quart/liter/litre low, instead of the 2 quarts low I was expecting. I suppose "better too soon than too late" but it causes concern where none is warranted.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
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"Oh lord won't you buy me a Mercedes Benz."
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