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Author Topic:   Merc warning buzzer
Smallfrye posted 11-19-2003 09:56 AM ET (US)   Profile for Smallfrye   Send Email to Smallfrye  
My 1994, 90HP Mariner has a problem I can't identify. The waring buzzer has been "clicking" intermittently. This "click" or "ticking" sound is like the alarm wants to go off but lacks the full signal.
I have disconnected the oil lines to the alarm and the ticking continues. The overheat sensor seems to work correctly when the water supply was blocked, so I'm not sure if this is failing. Is there any other warning sensors attached to the buzzer ?
One more thing, on start up the buzzer sounds for a second or two. I believe this is a diagnostic check of the system. Can anyone confirm this ?
Any experiance would be appriciated.
Thanks, Jim
Steve Leone posted 11-20-2003 02:20 AM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
Sounds like a faulty sensor. Ther are several tied into the system. Overheat of course, low oil at the VRO, but also the oil sensor on the cap of the reserve resivoir (this may be the culprit). Don`t ever block the cooling water to test an overheat sensor. Ground the sensor instead. You can do damage overheating an aluminum block, even if it is for a short period.
Clark Roberts posted 11-20-2003 07:49 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
The alarm horn may be defective. Replacement is difficult on the side mount control (where horn is mounted inside control box) and easy on a benicle control (where horn is attached to wiring harness). Mercury's oil injection (not variable ratio oiling or VRO which is a designation for OMC's oiling system) has one alarm sensor on the 90hp and that is located in bottom of the "under-the-cowling" oil tank. Suggestion> remove the oil tank and throughly clean, replace/refill and see if clicking goes away. It's a good idea to replace the clear plastic feed tube exiting tank and taking oil to the oil pump... good luck and happy Whalin'... Clark... Spruce Creek Navy

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