Hello everyone,

Two questions for a 1987 300E M103 engine:

1. My valve cover gasket is leaking, what is the correct torque for the valve cover bolts?

2. I have tested and determined that the auxiliary fan switch (green 3-pole) in the cylinder head has failed. Is there any sealant I should put on the threads such as teflon tape? The new one didn't come with an o-ring or anything. Also how much should I tighten it?

Thanks much!

-Chris

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Streetside: 1987 Mercedes 300E Petrol Blue/Green
2014 Ford Mustang Grabber Blue
1999 Ford Ranger Green

Dockside: 1968 Eltro 17
1985 Silverton 34C

The 8MM thread size nuts take about 8 ftlbs of torque.

The engine temp switch should have a crush washer & need no further sealant.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Thank you!

__________________
Streetside: 1987 Mercedes 300E Petrol Blue/Green
2014 Ford Mustang Grabber Blue
1999 Ford Ranger Green

Dockside: 1968 Eltro 17
1985 Silverton 34C