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    does black stain on vernatherm mean head gasket leak?

    I have a 1990 V4 140hp 2 stroke Johnson ourboard. One thermostat was not working and I fixed it. When disassemble it, found black stain on the vernatherm, looks like burned carbon deposit. I guess the thermostat had overheating problem before but why the vernatherm has black stain? It's in the...
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    Johnson V4 140hp 1990 CJ140TLESE Outboard Cooling System Diagram / Repairing Thermostat

    I guess I want to contribute to this forum as I learned some good stuff here, and others can save time/efford when dealing with the same/similar motor. I cannot say I am 100% correct on this and I am a naval architect desining ship but not a marine engineer neither a mechanic. I just like...
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    Yamaha T9.9 Corrosion

    I have a high thrust 9.9 outboard, and it corroded open at the back just above the exhaust hole, see the photos. Put my hand at the corroded opening when the motor is running and I can feel exhaust gas coming out of it, but point a flash light to it, I can't see it connects with the exhaust...
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    Mercruiser 5.0 MPI Constant Alarm when speed up and power reduced

    when reduce power to idle, alarm gone. When press the throttle-only button (disengage the gear) and rev up, no alarm at all. Drive unit oil full. What could be the problem? drive unit related? As from the service manual, the engine guardian stratety monitors, 1. oil pressure, 2. coolant temp...
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