Mercury 150 hp outboard alarm is going off

[fly2top78]

My Mercury 150 hp alarm is sounding off after 30 to 45 seconds of run time. Started this year after sitting up all winter. No problems at the end of last summer. The main oil reservoir is 3/4 full and the small resevoir on the front top of motor is full. Cranks and runs great. Water is "peeing" out of the pee hole after about 30 seconds of running then high pitch alarm sound coming from shifter area sounds. I just shut her down. Can I mix some oil in the gas, run it for a short time, and see if the alarm goes off or the oil level goes down in the resevoir?

Thanks,

LH

 

[BassnKY]

Re: Mercury 150 hp outboard alarm is going off

Just a thought. Make sure the connection to the low oil sensor has no come loose.

 

[BullyARed]

Re: Mercury 150 hp outboard alarm is going off

It could be the temperature sensor. Give it a check.

 

[BassnKY]

Re: Mercury 150 hp outboard alarm is going off

Don't the types of beeps signal the type of problem? If so, check the owners manual. This should help narrow down the problem.

 

[mogfisher]

Re: Mercury 150 hp outboard alarm is going off

What I've read on here is that often the gear on the crank that drives the pump strips after winter storage if the pump gets siezed. This would give you the warning that the pump is not spinning. I worry about this because I have a similar motor as you. I believe the oil warning is a beep beep beep. Temp is constant beeeeeeep. Also, the oil warning has a delay on it but the way it's wired the temp is instant on as soon as it sees overtemp (or a ground signal on the overtemp wire). Don't take my word though as I'm just relaying bits a pieces of what I've read on here.

 

[j_martin]

Re: Mercury 150 hp outboard alarm is going off

Sheesh, what a fog.

continuous tone = either temp sensor or a short in the system, which could be in the wiring, the ot sensor, or the oil module.

beeping is from the oil alert. It could be fault input signal, including the engine mis-firing, a faultly oil alert module, or a true alarm because it is either low on oil or the pump is not turning.

Before you run it one more second, mix oil with your fuel at 50:1. If it's not oiling, you'll save your power head. If it is oiling, you'll gum up a spark plug after awhile maybe.

In the manual is a complete diagnostic sequence to troubleshoot the oil alert system.

hope it helps
John

 

[Robot1947]

Re: Mercury 150 hp outboard alarm is going off

See www.marinesolutionswi.com for instructions on how to check for a stripped oil injection drive gear.