Anther thermostat overhaul (1 Viewer)

[steffan]

Probably been covered a thousand times but here are some fresh pictures. Thought I had the new engine sorted out after 500 miles but when I went to check, found another leak around the thermostat housing. In hindsight, it could very well have been just a leaking bypass hose but seemed to be around the whole housing.

 

[steffan]

I had a bunch of this 3M gasket material so decided to try it out since the paper didn't hold up well

 

[steffan]

I think I remember some discussion on the orientation of the gasket: over or under the thermostat. This is a '76 2F and with the recess on the bottom housing, the gasket has to go on top.
I put the smallest of skim coat of form-a-gasket on both sides just for good measure. I'll report back to see if it holds

 

[cruisermatt]

The housings are available new relatively inexpesively if you want to do it right. Looks like yours has corrosion/pitting on the gasket surface whih is why it didn't seal for you with the correct gasket.

 

[Augustiron]

I have also found they deform over time and multiple installs.
Check for flatness by hand planing the mating surfaces on a piece of glass with 320 grit sandpaper taped to it, odds are only the ears make contact at first.

Or get new parts