Question regarding thermostat housing Mercruiser 4.3

Kubaat3lover

Chief Petty Officer
Joined
Jun 6, 2019
Messages
443
Hi folks,
During thermostat replacement Ive cleaned and smoothed the housing surface,
this is the picture BEFORE,
but after brushing with sandpaper and cleaning it do I have to paint it with PhantomBlack Quicksilver or i can leave the bare metal there?

Take care
 

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alldodge

Moderator
Staff member
Joined
Mar 8, 2009
Messages
42,067
No reason to paint, those are the sealing surfaces and should be held tight by the gasket
 
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