View Full Version : Buzzer Alarm problem or not?
1987 Tri Star buzzer alarm goes off when temp. gauge hits 180, goes away at 1\4 throttle. I do not think 180 is to hot or so I have been told . Mastercraft tech told me in boats that old they would just disconnect alarm and use gauges. I have replaced themostat,water pump,heat sensor I even moved themostat up 10 degrees still get alarm at 190. Any thoughts
08-04-2013, 04:52 PM
That buzzer is triggered by two things: oil pressure (lack thereof) or engine temp (too hot). What does your oil pressure gauge read when the alarm goes off?
The pressure senders are known to fail after a long life, and maybe yours is on the way out. They're cheap... a good project for the off-season.
PS: A bad ground can also screw with your gauge readings and trigger the buzzer even when there is not actually a problem. Does your voltage/oil/temp gauge change when you turn on a blower or a radio?
Gauges jump slightly, but alarm seems to be working in conjuction with temp. gauge, when temp. hits 185 190 and alarm starts I just back off and run at idle for less than 5min. temp. drops back down to 170ish alarm goes away oil,batt. all good
08-04-2013, 05:24 PM
Do you happen to know which thermostat you are running? 190 degrees seems pretty toasty for these boats.
My 1987 351 lives at 160 degrees.
In this thread (http://www.mastercraft.com/teamtalk/showthread.php?t=30244) it's said that the alarm will sound at 200 degrees. As mentioned in that thread, if you're getting that hot be sure to let the engine idle before shutting down.
Thanks for input need all the help I can get will replace sending unit and pull dash to check grounds was thinking about replacing oil,temp.,volt gauges but they seem to be working just fine. STUMPED ?
Old one was 145 replaced with 160 ,alarm starts 180ish temp. has never been above 200 slighty below.