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Water Pump/Thermostat

E-Class (W212) 2010 - 2016: E 350, E 550

Water Pump/Thermostat

Old 03-01-2019, 10:08 PM
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2011 E350
Water Pump/Thermostat

I have the new water pump and thermostat ready for install... All I need is the weather to cooperate but not expected until at least middle of month.

The question is with the steel and rubber coated gaskets do I still need or want RTV? Do I want RTV, Gasket OR BOTH? I am thinking one or the other as the last time I used RTV on a rubber gasket it leaked.
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Old 03-01-2019, 11:10 PM
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2011 E-350 4Matic Sport
You typically don't use any sealant on rubber gaskets. Tightening the bolts makes the rubber grip the clean surfaces for sealing.

Exception example is sometimes at a sharp corner of a valve cover gasket, sealant can be applied if recommended by mfg.
Misc preference: I have long switched to Hondabond over regular rtv for sealant applications, amazing stuff.
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Old 03-02-2019, 08:05 AM
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2007 cls550
No RTV but ensure you have the right torque specs and get a piece of cardboard to punch holes and keep bolts in order. Different lengths.
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Old 03-02-2019, 03:44 PM
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2010 e550 p2
Just the gasket
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