Slow Safe Question

[dsinger]

1997 150hp OMC. It will run good but once you get over 3600 to 4000 RPMS the slow safe will shut it down. Right before the slow safe activated you get a oil horn. My question is could it be the sensor in the oil tank or is the VRP pump going bad and just cannot keep up at that RPM. Would the pump tell the motor to slow or would the tank sensor. I know it is not a slow safe because of heat because when it happens I can put my had on the motor and it is not hot plus just put a new pump in it. Just prior to me putting the pump in it it got hot. Once the motor goes into slow safe you can reset it by turning the key off and back on. Is there another reset on the motor that has to be reset or just by killing the power to the motor.

I know that is alot of questions but thanks for any help

 

[Silvertip]

Re: Slow Safe Question

There are three audio alarms associated with the alarm system. Which one are you getting -- Constant beep, on-off beeping once every few seconds, or beep every minute or so? Constant beep is overheat. A beep every few seconds is no oil (not necessarily out of oil). Beep every minute or so is low oil warning. You may also have a fuel restriction that will trigger an alarm. Try disconnecting the temp sensor wire MOMENTARILY and see if that kills the warning. If not, you have an oil system problem. If it is an overtemp warning DO NOT leave the wire disconnected -- fix the problem. It may be as simple as a bad sensor or warning module.

 

[dsinger]

Re: Slow Safe Question

It is a oil signal but when that signal goes off does that turn the slow safe on. At what point does the signal go off at the oil tank or is there a sensor in the motor. Just trying to figure where the problem is in the pump or just a sensor in the oil tank turning the slow safe on.

 

[Seasport]

Re: Slow Safe Question

Do you have the System Check gauge on your boat? The lit up warning light will tell you whether it is a low oil, no oil, overheat or fuel restriction problem (check engine).

The VRO does have a sensor which detects a no oil situation.

Take a look at
http://continuouswave.com/whaler/reference/VRO.html

for a comprehensive description of the VRO.

The only way to reset slow is to turn off the ignition.

 

[ob]

Re: Slow Safe Question

The only alarm that initiates the s.l.o.w. system is an overheat which is triggered by the temp sensor.Describe the alarm tone you are getting and we can help peg down the source.Constant tone,one short tone every 30 seconds,rapid short tones?

 

[dsinger]

Re: Slow Safe Question

It is rapid shot tones then the slow safe will activate. After the slow safe activates the tone will quite.

 

[Seasport]

Re: Slow Safe Question

Rapid short warning tones indicate a no oil flow problem. SLOW will kick in when this happens (if I'm not mistaken it stands for Speed Limiting Oil Warning).

So I think you have a problem with either the VRO, oil lines or the no oil sensor. The no oil sensor compares the rpm signal from the tach with oil pump pulses from the VRO and triggers an alarm if they are different.

 

[ob]

Re: Slow Safe Question

Speed limiting overheat warning.If you are getting rapid short tones it may indicate a no oil flow condition which will indeed cause an overheat situation.The s.l.o.w. if initiating correctly should limit the rpms to 2500.If the alarm module recieves two simultaneous signals,I have no idea whether one will cancel the other.In summation ,according to my written literature from OMC corporation that the s.l.o.w. is only initiated from the overheat sensor lead.Reason being is that if your VRO pump was to fail at sea,you could mix oil and fuel at 50:1 in the fuel tank and drive back at full throttle with the no oil alarm beeping away.

 

[Seasport]

Re: Slow Safe Question

Good point re premix OB. I'm sure you're right. I guess the question now is why is he getting the no oil alarm.

 

[biggrouper]

Re: Slow Safe Question

I had the same problem with the oil horn activating at higher rpms with my 200hp FICHT. Check the bottom of the oil tank for sludge. I did just that and found out that the pump in the tank would clog with the sludge in the bottom of the oil tank. Try cleaning the tank, replacing oil hoses, etc., and add fresh oil and see what happens.