Join Date: Sep 2006
Thanked 11 Times in 11 Posts
Rep Power: 9
What did it open at there JM? Is it the right thermostat? Were your observations made under load? Put it in gear and work the motor a while.
If the thermostst is shut, the temperature in the water jacket really should rise until the thermostat opens, then the temperature guage will drop abruptly.... then it repeats. There really is a lot of heat thrown off by the liners and cylinder head, enough to boil the jacket water promptly if the thermostat is closed.
I am puzzled.
Put your hand onto the top of the exhaust manifold where the water is injected into it. Does the temperature oscillate (after warm up and under load) ? Take the wee temperature sensor plug out, touch the body of the plug to the manifold (to keep electrical continuity) and pour some boiling water over the temperature sensor. Have a friend tell you if the temp reading is changing.