All,
Just started my outboard (with ear muffs over water pump area) the first time in 18 months - after an extensive storage period of non-usage.
It ran fine (idle only) up to 3 minutes - then an alarm sounded at the console and i turned it off. I do not know if this alarm was caused by overheating or another tigger?
- the fuel is new.
- water pump/impellor is new (installed just before layoff in 2008).
- new thermostats and confirmed they open at the right temps (installed just before layoff in 2008).
- cleaned all cooling passageways, head internals in the block and exhaust area
- no cracks in cylinder heads.
- good / even compression from all 4 cylinders.
- fairly healthy water flow from **** hole.
- water does splash out from the propellor area.
- water supply pressure from tap not the strongest IMO.
- both heads were hot to touch.
- all water deflectors in block have been replaced and are not swollen.
It is noted that it is best to measure the temp at the cylinder walls, not on the cylinder head because there is very little cooling water around it. The head gets very hot normally and will burn your fingers.
I am using OEM oil mixing container which is connected up to motor.
Questions....
- best way to test ohms for temp sensors and in what type of oil bath?
- what temp/ohm triggers off the sesnors?
- how to determine if the water supply pressure is sufficient to prevent possible overheating?
- how to determine if this alarm is triggered by a strong vacuum in the fuel line or another cause?
- does a vacuum switch exist on this motor (if so where exactly)?
- where exactly are vacuum switches normally located on other motors?
- how to ensure I am not running my 2T fuel mixture too lean (hence too hot) ?
- exactly where at the cylinder walls should running temp. be measured?
- what is a good brand laser temp. measuring device?
- how to confirm if heat sender is faulty (causing alarm to trigger)?
Any advice on next steps to diagnose this problem would be much appreciated.
Just started my outboard (with ear muffs over water pump area) the first time in 18 months - after an extensive storage period of non-usage.
It ran fine (idle only) up to 3 minutes - then an alarm sounded at the console and i turned it off. I do not know if this alarm was caused by overheating or another tigger?
- the fuel is new.
- water pump/impellor is new (installed just before layoff in 2008).
- new thermostats and confirmed they open at the right temps (installed just before layoff in 2008).
- cleaned all cooling passageways, head internals in the block and exhaust area
- no cracks in cylinder heads.
- good / even compression from all 4 cylinders.
- fairly healthy water flow from **** hole.
- water does splash out from the propellor area.
- water supply pressure from tap not the strongest IMO.
- both heads were hot to touch.
- all water deflectors in block have been replaced and are not swollen.
It is noted that it is best to measure the temp at the cylinder walls, not on the cylinder head because there is very little cooling water around it. The head gets very hot normally and will burn your fingers.
I am using OEM oil mixing container which is connected up to motor.
Questions....
- best way to test ohms for temp sensors and in what type of oil bath?
- what temp/ohm triggers off the sesnors?
- how to determine if the water supply pressure is sufficient to prevent possible overheating?
- how to determine if this alarm is triggered by a strong vacuum in the fuel line or another cause?
- does a vacuum switch exist on this motor (if so where exactly)?
- where exactly are vacuum switches normally located on other motors?
- how to ensure I am not running my 2T fuel mixture too lean (hence too hot) ?
- exactly where at the cylinder walls should running temp. be measured?
- what is a good brand laser temp. measuring device?
- how to confirm if heat sender is faulty (causing alarm to trigger)?
Any advice on next steps to diagnose this problem would be much appreciated.