CVH Thermostat housing - Bypass Valve

[list...@liberator-systems.co.uk]

As part of cooling system overhaul I removed the thermostat housing on my cvh motor. On the hot side of thermostat there is a passge way which looks like it leads to the small bypass outlet on top of housing via some sort of valve. It appears valve is supposed to seal via a ball bearing which I can see part of but cannot get it to move.

Has anyone dismantled/replaced one of thes valves? - it look like a small core plug would need to be removed to gain access.

I read somewhere on net that some cvh motors used a wax pellet in this passage way which melted in overheat situation to protect engine. I think my housing is an early type - part no.82SF-81K572 3A. Looking at photo valve is up the lefmost hole.

[Jim Hearne]

I think there is a ball bearing in there, it normally rattles around, you can hear it if you shake the housing.

I always assumed it was to do with bleeding air from the system but i may be wrong.

 

Not heard of it being a wax pellet.

 

Jim

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[list...@liberator-systems.co.uk]

No rattle on mine. I can see the face of what looks like ball bearing but cannot move it backwards. My guess is the ball bearing is supposed to be spring loaded. I think the idea is to protect against the thermostat failing to open - pressure build up in the heater only circuit then blows the ball bearing off its seat releiving pressure to the expansion tank outlet. It looks like remvoing the small core plug on housing would give accees to ball/spring whatever is in there to clean/free up.