Mariner 50 HP overheat alarm

M

McGurk

Cadet
Joined
Jul 7, 2002
Messages
11
My 1986 Mariner 50 sounds the temp alarm only at WOT. Replaced the water pump and have good telltale water flow before and after the replacement. Temp sensor seems OK based on a stove top test. Does anyone know if this engine has a thermostat? The manual is not clear about this. It is a 3 cylinder 50 HP model.
 
O

orca

Chief Petty Officer
Joined
Jul 12, 2002
Messages
422
Re: Mariner 50 HP overheat alarm

G'Day Merc were going through a transition stage with their 50hp at that time, your motor could be one of 2, the older motor had a clam shell cowl and MAY have a thermostat, the only way to tell would be to remove the exhust cover plate. the later motor had a lift off cowl, this definatly had a thermost mounted at the top of the exhust plate and easily accessible.
 
M

McGurk

Cadet
Joined
Jul 7, 2002
Messages
11
Re: Mariner 50 HP overheat alarm

The motor has the clam shell cowl which would make it the older model you described. If it has a thermostat, please tell me were it is and how I get to it. No information about it in the Mariner manual. I am very good with most mechnical things but this is my first outboard engine. I wish it was a diesel, I would know what to do.
 
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