I have a 97 4 cylinder 2 stroke mercury 40 that is confusing us. The oil injection has been removed and I mix the gas at the tank. Otherwise stock. The motor has always been used in salt water but has been flushed after each use. While running up the intercoastal waterway, the water-pump stopped pumping water...had steam coming from the pee hole. Limped to the dock on the trolling motor.
Replaced the entire water-pump assembly. Back flushed thru the pee hole with free flowing water from the foot. Water from the pee hole runs with a broken stream and is scalding hot. My mechanic thinks the problem is exhaust in the cooling system from a leaking gasket between the power head and the drive housing. The bottom 3 cylinders are cool to the touch and the top one is hot but not burning my hand. I removed the foot and placed city water onto the water-pump discharge pipe and have the same symptoms when running the engine. The motor runs like new. Starts quickly and idles perfectly.
Can there be a blockage I'm not getting to flush?
Is there a best practice to backflush this engine?
HELP!! The fish are starting to bite and I'm on the dock!!
Sonny
Replaced the entire water-pump assembly. Back flushed thru the pee hole with free flowing water from the foot. Water from the pee hole runs with a broken stream and is scalding hot. My mechanic thinks the problem is exhaust in the cooling system from a leaking gasket between the power head and the drive housing. The bottom 3 cylinders are cool to the touch and the top one is hot but not burning my hand. I removed the foot and placed city water onto the water-pump discharge pipe and have the same symptoms when running the engine. The motor runs like new. Starts quickly and idles perfectly.
Can there be a blockage I'm not getting to flush?
Is there a best practice to backflush this engine?
HELP!! The fish are starting to bite and I'm on the dock!!
Sonny