Home › Forum › Ask A Member › 1985 johnson 9.9 running temp › Re: 1985 johnson 9.9 running temp
Like Bill says, the grommet problem is chronic on these engines. Is this a salt water engine? I surely don’t want you to rip the thing to pieces without exhausting all the simpler solutions first though. Was this engine running hot before the impeller change? You just changed the impeller, perhaps the liner/hsg/SS base are NG. Another chronic problem on salt water engines is the thin wall under the SS impeller plate. The thin aluminum erodes away under the SS impeller plate, allowing exhaust to be pulled into the water pump.
The overboard indicator stream is after the upper water tube grommet, so it would be affected by a crushed grommet. I have noticed a specific symptom on these telltales when the grommet is crushed though. When first started, the overboard streams seems "OK". Once the engine heats up, the stream weakens, then you will see a big puff of steam coming out of the telltale instead of water.
Tell us more about the engine, don’t want you to rip this thing to pieces for nothing.