2000 40hp merc alarm sound

Post by **banjo** » Wed Jun 07, 2006 12:10 pm

My motor after trolling for a while the first time out this year started to make a loud buzzing sound. Not the motor itself, but a warning buzzer located under the console. The motor is oil injected... is it that this isn't working that set the alarm off? Is there a way to know if the oil injection is working? Any other ideas?

Post by **Wallyboss** » Wed Jun 07, 2006 1:46 pm

In your owners book it should tell you what the different alarms are. My father-in-laws Evinrude it was a steady alarm that meant the oil pump wasn't working.

Post by **ady** » Thu Jun 08, 2006 11:45 am

My old 60 Merc used to do this when trolling. It's doubtfull it's your oil, normally the pumps are set high for idle and you can smell them from a 100yds away. My problem was a worn impeller, it pumped enough water for general use but couldn't handle the idle rate. New impeller, never heard it again.

Post by **Haybay Larry** » Sat Jun 10, 2006 4:07 pm

I too would put money on the impeller being bad. They aren't hard to replace and don't cost a huge amount. The last problem you need is a cooling system problem that cooks the motor.
They should be replaced periodically. Different people and motors have different opinions but it depends on how much it's used and also just sitting there the impeller will stay in the bent position. It wouldn't be wrong to change them at least every 2-3 years...larry

Post by **Sportspal** » Thu Jun 15, 2006 7:12 am

I was going to start a new thread and until I saw this one going and realized that I was about to ask the exact same question.
My 1998 25hp Johnson was making a loud warning shriek when I was trolling yesterday, and it wouldn't stop. I turned the motor off, and noticed it was smokin hot. I let it cool down, and I could go full-out around the lake without issue, but when it went to idle, or a troll speed, the alarm came back on ringing.
I had a feeling it might be the impeller or the waterpump....I'm going to change the impeller first......

Post by **ady** » Thu Jun 15, 2006 12:14 pm

Sportspal wrote:I was going to start a new thread and until I saw this one going and realized that I was about to ask the exact same question.
My 1998 25hp Johnson was making a loud warning shriek when I was trolling yesterday, and it wouldn't stop. I turned the motor off, and noticed it was smokin hot. I let it cool down, and I could go full-out around the lake without issue, but when it went to idle, or a troll speed, the alarm came back on ringing.
I had a feeling it might be the impeller or the waterpump....I'm going to change the impeller first......

I think the impeller is the water pump - is it not???

Post by **Sportspal** » Fri Jun 16, 2006 8:09 am

The impeller is just a small circular device with fins that spins and sucks water into the engine for cooling....