Quote from T=CUT
"I don't see any significance in the 28mm measurement. That was simply the rebound measurement after allowing air behind the piston. It showed that the seal of the envelope is pretty good, but it's not perfect. When the piston is held compressed for a while. the protrusion will be less because the air will have escaped."
Hi T-cut,
My mistake regarding the 28mm, it should have read 18mm, this is with reference to French Mike and his photo showing the unit against a ruler in post 236.
I understand your reasoning with regard to the ingress of water, but was wondering that if, the hard particles you have discovered, accumulated under the rubber sleeve at the pointed end of the push rod, would this prevent the push rod returning to it original starting point over a period of time as the deposit built up.
This was the reason for my question about the length of the push rod sticking out of the brass capsule, and wondering if this changed between faulty and new units, since this length is critical to the opening point of the thermostat.
Cheers, Pete.
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