Hello,

Does the thermostat have a correct orientation on a W124 M103? Manual says to install ball valve at highest point, housing appears to be level to me. Since there is no highest point, the ball valve can be anywhere in the rotaion, can it not? Car is '86 300E W124 M103.

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David
1986 300E Anthracite + ECodes + MB Mileage Award

The sensing bulb goes toward the engine, not the radiator.

Hope this helps,

I don't believe horizontal rotation matters, it's vertical orientation (i.e. water flow) that counts.

Larry Bible is correct. It's the way the factory had the thermostat oriented on my 300E when I changed it.

If I understand the question correctly it refers to the rotation of the thermostat in the housing. When I replaced mine I wondered about that too. The stat can be rotated with the bridge in line with the axis of the engine or perpendicular to it. I split the difference and rotated it 45 degrees.

As previously noted, there is no high point so the location of the jiggle valve should not matter.

I know the thread started out - W124/M103, but interestingly enough, my W126/M103 has a higher spot at approx. 2 o'clock.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"

On my M103 engine in my 124 the gold colored bridge is facing up....

Huh, that's interesting. I didn't know that. Can anyone explain what that little ball does? I've always wondered about it...

It's a small air vent.

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Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.

That little valve in the thermostat is sometimes called a "drizzle valve" The thermostat should be rotated until the drizzle valve is at the highest point available.

This was a mystery to me for al long time too!

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Tom Latos
2002 E320
1995 E320 Sold at 288kmiles

So the gold bridge portion goes towards the engine?

Is this correct?

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)