1988 135HP V-6 Merc OB oil/temp alarm.

[merc135jj]

My alarm sounds intermitantly about 1-2 minutes after initial starting and last for about 3 minutes and then stops. If I stop the motor and restart it again after 30 minutes to an hour it does not do this at all. The mechanic has replaced the heat sensor, oil sensor wires(which were twisted very bad), checked the oil injector, and the water pump. <br /> He has also removed the sensor wires one at a time while it is running and cannot get rid of the sound. He has check all of the motor wires and can not find any shorts.<br /><br />ANY IDEAS?<br /><br /><br />Thanks

 

[MERCMAN]

Re: 1988 135HP V-6 Merc OB oil/temp alarm.

More than likely it is the oil module witch is on the side of port head you can not check system by unplugging sensors while engine is running it will set alarms off if all sensors ohm out it is the module. This is not factory test but you can tap on module and if horn stops the module is bad.Or if not honking tap on module and horn honks it is bad

 

[freddie]

Re: 1988 135HP V-6 Merc OB oil/temp alarm.

Mercman is probably correct but if not,I've seen the oil pump motion sensor do the same thing.