Mariner 75hp alarm

[Captain JAB]

Hi Folks, Just new to the site and wondered if anyone could help me. I have a 2002 Mariner 75hp 4stroke which runs as sweet as a nut, doesn't burn oil and pumps loads of cooling water. Recently I have started to get a warning alarm go off on the first start up of the day for 30-40 seconds. After that the engine can be stopped and started all day long with no alarm. The alarm does not sound at any other time. I have checked oil level and grade of oil and all seems to be fine. I was wondering about a sticking or faulty oil pressure sensor but don't know enough about them to start interfering at this stage. Any advice would be much appreciated. Thanks John

[Polwart]

Welcome,

That engine is not one I have any practical experience of - but is the alarm continuous during that time: i.e.

beeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeep

or

beeeeep beeeeep beeeep beeeeeep beeeeep

?

that usually gives some indication on the origin.

[gasman]

Is it a service indicator??
Ian

[uncle al]

the alarm will only sound for an oil or o/heat problem, or a wiring fault, check the thermostate ther is a merc/mar dealer in Largs ask them to put the diagnostic computer or the diagnostic light (if its a yamy p/head) it could be the water grommet between the adapter plate and leg

[uncle al]

you can either phone a merc/mar dealer and ask them , or load brunswickmarineemea.com into your computer go onto the download centre find the correct h/book find what you want then delete it from your computer or print it , but untill you find out wether it is oil or o/heat you could be weeing against the wind