Hi guys, my first post and I have a curious "problem".
I have a 17ft consoleboat and a F40 Yamaha TLR (11 1/2 * 13 p bog standard prop) from 2006, 150 hrs running time. Nice boat and ditto engine.
Takes some time to get on step, max speed on gps is 55 km hours. WOT is 5100 rpm. Last week the engine gave a temp fault on the digital tach. No buzz, but it went into low rev's. As it was time for a maintenance i took the boat out of the water and ordered repair kit 1 and 3.
I'm no outboard geek, but i was trained a car mechanic and know all about engines and how they work.
I replaces/cleaned the following items:
Impeller kit.
Gaskets.
Motor oil
Oil filter.
Fuel filter.
Plugs.
Lower unit oil.
Carbs.
Fuel filter.
Also, it was time to replace the prop, the original was worn and torn. I went for a 12p 11dia SS 4 blade prop from merc; difference is awesome btw. Kick right on step en WOT is 5600 rpm.
But anyway. After replacing/checking al the standard components the engine still goes into temp alarm !! Basicly this is NOT possible because :
Engine is running fine, no fuel/oil issues. Engine temp is 85C (checked with temp probe) Thermostat is working nicely, you can observe it open and close while running). Waterpressure in block is ok/measured. Thermistor works ok, checked. You can see the thermostat working on pressure gauge, open close/open close. Spark plugs are right color. Engine runs smooth. Took her out in open water this afternoon and the boat and motor handle like a dream.
Sow...the only think I can think is; " why have I still this temp alarm on the tach display ?"
Any suggestions ?
Thanks in advance,
Franck.
I have a 17ft consoleboat and a F40 Yamaha TLR (11 1/2 * 13 p bog standard prop) from 2006, 150 hrs running time. Nice boat and ditto engine.
Takes some time to get on step, max speed on gps is 55 km hours. WOT is 5100 rpm. Last week the engine gave a temp fault on the digital tach. No buzz, but it went into low rev's. As it was time for a maintenance i took the boat out of the water and ordered repair kit 1 and 3.
I'm no outboard geek, but i was trained a car mechanic and know all about engines and how they work.
I replaces/cleaned the following items:
Impeller kit.
Gaskets.
Motor oil
Oil filter.
Fuel filter.
Plugs.
Lower unit oil.
Carbs.
Fuel filter.
Also, it was time to replace the prop, the original was worn and torn. I went for a 12p 11dia SS 4 blade prop from merc; difference is awesome btw. Kick right on step en WOT is 5600 rpm.
But anyway. After replacing/checking al the standard components the engine still goes into temp alarm !! Basicly this is NOT possible because :
Engine is running fine, no fuel/oil issues. Engine temp is 85C (checked with temp probe) Thermostat is working nicely, you can observe it open and close while running). Waterpressure in block is ok/measured. Thermistor works ok, checked. You can see the thermostat working on pressure gauge, open close/open close. Spark plugs are right color. Engine runs smooth. Took her out in open water this afternoon and the boat and motor handle like a dream.
Sow...the only think I can think is; " why have I still this temp alarm on the tach display ?"
Any suggestions ?
Thanks in advance,
Franck.
