Outboard Motors Troubleshooting
November 15th, 2011 | 
Author: outboard motors troubleshooting
Outboard Motor Troubleshooting with a Spark Tester
2001 mercury outboard 150 hp alarm?
When running the engine at 1/2 throttle the motor sounds as if it’s lugging, and then the alarm sounds. I shut down, but when I turn the key back on the alarm is still there for only about 5 min. then ok. I pulled the water pump and it looks brand new. Less than 100hrs on engine. Can I troubleshoot out of water? Or do I have to wait until alarm sounds?
HI .. if you pulled the water pump.. the impellor you should have replaced it. They are easily damaged. Now .. heres the second thing… when you run the boat.. is the alarm a continuous alarm … Or is it a series of fast beeps.
Continuous beep its overheating alarm… series of beeps its the oil pump. Do you havea an on board oil tank.. and an oil tank on the motor. My 2003 had an onboard tank which holds a gallon and an engine mounted which holds about a quart.. the pump pumps oil from the big tank into this for correct mixture. Now if you dnt prime the engine first.. put key in turn to on but dont start and then push the throttle control forward and back t2-4 times. This primes the oil pump. If you dont do this then the pump wont work properly and the tank on the motor doesnt feed the engine properly.
Now if its a continuous .. check the thermostat is opening and closing if you take it out put in a new one. . Check the pee ( tell tail) hole it can get blocked very easily. … do you flush the motor after every use.. even in fresh water?? Two ways to flush.. one with muffs and the other is some of the later 150s have a hose connector on the front.. you can flush without running the motor. I did both… becasue crap accumulates in the bottom unit water pump and impellor. It is forced up into the motor and out through the telltail.. However.. the intakes are larger than the teltail …. you need to make sure the crap hasnt blocked the tell tail. .. If it still goes off .. you need to find out if the engine is actually overheating and that it isnt an electrical fault.
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