Posted by pete 23 on March 21, 2015 at 20:00:31 from (50.33.12.37):
In Reply to: Thermostat? posted by unioncreek on March 21, 2015 at 19:10:21:
Contrary to popular opinion, an M or H should come up to at least the low side of run even without a load on them. The problem is that the thermostat does not seal in the housing. Some sealed poorly when new and they never get better. The housing erodes around the outside of the thermostat. Those thermostats work different than an auto thermostat. On these the tube moves when it opens. Fully open it is supposed to block off the bypass completely. Well, most housings are so rusted and pitted they just don't work well. Just look in the radiator when starting it cold. You will most likely see a considerable amount of coolant flowing into the tank from the upper radiator hose. If that thermostat is working right you will not see any flow or just a small trickle. I have installed seals in some housings but not all housings have enough material to install a seal like the diesel engines use. Then I jury rig a spring, washer and seal that works quite well. And don't use an automotive thermostat as that messes up the bypass system and causes air pockets in block and head.
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