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M bypass - what info is correct?

N

notjustair

Well-known Member
Ok, after reading responses I am totally lost. I assumed that the coolant bypass was the crescent shaped hole in the front of the thermostat housing that routed up and around the t-stat.

Now I hear the small flexible hose between the pump and housing is the bypass. Isn't that hose there just to provide a circulation loop for the block when the stat isn't open? You can't circulate water through the block and avoid hot spots without a loop. Also, that hose connects in on the hot side of the stat not the cold side so it can't be a bypass can it?

Which is the bypass - the crescent hole or the small rubber hose?
 
Yes.LOL
The thermostat bypass is used to allow some flow past the thremostat to let air out of the system, and to prewarm the radiator contents, and assure some rad flow. the system bypass (hose thing) is used to force coolant circulation in the block while warming, and after to a degree(no pun intended). It is inportant in that zero internal flow allows hot spots and warped metal from uneven heating. Not your T-stat issue. Jim
 
So the system bypass is the hose - for circulation. It is the other hole (crescent shaped) around the stat that I need to braise partially shut, right? That is the way I originally understood it based on the service manual. I wasn't so sure after reading responses.

It looks like cast, right? I don't think I have enough gas to braise anything. That is on the todo list.
 
Yes to both.

The crescent-shaped hole is the one you need to fill/drill. And the t'stat housing is cast iron.
 
If you are insistent on closing the crescent shaped passage, get a piece of 1/16 thick flat metal, cut the bolt holes, thermostat hole and whatever size hole you want for the crescent shaped hole. Use a gasket on each side of the plate. NO ruining a good part and it is reversible if you mess up.
 
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