mlevee87
Cadet
- Joined
- Feb 11, 2015
- Messages
- 18
Over heating only when trimed out at over 4800 RPM. Maybe my motor is mounted high?
I get an over heating alarm on my 1989 100hp Mariner outboard only when I'm at full throttle or anytime I pass 4800 RPM which is usually after I get up on plane and trim out my motor to push out some extra power for top end speed. To avoid an overheating alarm I can run my engine at about 4600-4700 RPM with the engine trimmed all the way down. I've been chasing this over heating issue all winter and last summer. I have had water pump replaced, bell housing, thermostat, poppet valve and I still have the same problem. I even moved my transducer away from the lower end thinking maybe it was creating air pockets near the water intakes on the engine. Either my engine is sitting too high on the transom or maybe an over sensitive temp sending unit?
Please see these photos and let me know what you think. I do have two spaces to go if i want to lower the engine on the transom bracket which would drop the AV fin by maybe an inch and a half or so.
I get an over heating alarm on my 1989 100hp Mariner outboard only when I'm at full throttle or anytime I pass 4800 RPM which is usually after I get up on plane and trim out my motor to push out some extra power for top end speed. To avoid an overheating alarm I can run my engine at about 4600-4700 RPM with the engine trimmed all the way down. I've been chasing this over heating issue all winter and last summer. I have had water pump replaced, bell housing, thermostat, poppet valve and I still have the same problem. I even moved my transducer away from the lower end thinking maybe it was creating air pockets near the water intakes on the engine. Either my engine is sitting too high on the transom or maybe an over sensitive temp sending unit?
Please see these photos and let me know what you think. I do have two spaces to go if i want to lower the engine on the transom bracket which would drop the AV fin by maybe an inch and a half or so.
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