Buzzing in throttle housing '84 Johnson 90HP 4 cyl

[Viking NH]

Hi all, have no idea why a loud buzzing horn in the throttle housing goes off sometimes. Even when turning the key to on (not started), it buzzes loudly (think of the VW in Little Miss Sunshine!). Boat runs just fine with buzzer going and then poof it goes off. What causes this buzzer?

 

[racerone]

Overheat warning buzzer.----Best look at the water pump first.----Failure to sort this out could lead to expensive new motor purchase.----Post compression test results.

 

[ct1762@gmail.com]

there is supposed to be a rubber insulator on the outside to prevent it from closing its circuit, but agree with Racer make 100% sure its not overheating!

 

[jimmbo]

I will assume you bought the Engine 2nd hand and it didn't come with the Owners Manual, which would have explained why there is a Buzzer/Horn in the Control Unit. zprior to 1968, any Overheat Warning was a Red Light in the Dash, but I suspect by 1968, OMC got the Idea a Audible Warning would less likely to be Missed/Ignored

 

[racerone]

In 1970 they had the tiny red warning light on top of the control box.----Nobody can look at the control box all day.----In 1971 they installed the horn.