Re: any harm in back flushing ’67 Johnson 100 hp?

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September 28, 2015 at 1:42 am #24740
boatman
Participant

    Back flushed the cooling passages, looked like they flowed water pretty well. Put in the replacement thermostat. Will get it on the water tomorrow for a test.

    I put two of the thermostats from donor engines in a pot of boiling water. One plunger moved a little, one didn’t seem to move at all. Also one plunger rod comes out of the thermostat completely. The other one seems to be attached. Is this normal? I put the one with the detachable plunger rod in the motor and buttoned it up.

    Thanks,
    Paul