F115 Overly Sensitive Oil-Pressure Sensor

[Jersey Jim]

Has anyone experienced intermittent low oil-pressure alarms at startup of an F115 Yamaha? Mine is a 2002 (built in June 2001) and has a 22 psi minimum-pressure rated switch. The year prior, Yamaha had switched from a sensor with a mere 2.5 psi threshold. I had the water pump and T-stat changed today, and the startup yielded the same alarm for the mechanic that I had experienced on occasion. Upon verifying with a mechanical pressure gauge, a pressure was read of 18-20 psi (at cold idle) until revving the motor. After that initial revving the pressure immediately climbed to 72-74 psi and stayed there. The motor gives no indication (audibly) of being starved of oil. Yamaha claims they don't worry about excessive pressure until 95-100 psi. Has anyone experienced this low pressure alarm from time to time, or found pressure sensors to be problematic?

Jim

 

[Porkchunker]

The only time I've had my 2002 F-115 motors alert, were when I was fishing at the CBBT in Dec. It was cold (ice on the deck), and the alarm went off on one engine. I shut it down and restarted and the alarm didn't sound again. Problem happened one other very cold day, and has never happened again.

Dave

aka

 

[Jersey Jim]

Dave, That's encouraging to know. I also had a couple of occasions where the same oil alert occured on very cold mornings. Like I mentioned in the above post, ours is the year that Yamaha switched to a much higher rated switch-point for pressure. I would like to find an aftermarket sensor that switches at approx. 15 psi. The mechanical gauge indicated 18-20 psi during the brief alarm. Your input was EXACTLY what I was looking for, and results I was hoping for, especially with an identical year motor. Can you tell me if one needs to shut off the key in order for the flashing oil-symbol to cease/reset, even though the audible buzzer silenced once the pressure rose? I just don't recall at what point the flashing icon went out.

Jim

 

[Porkchunker]

I believe so. I turned mine off in a panic. Then restarted as a double-check. The buzzer and the blinking symbol didn't reappear when I restarted. Same thing both times.

I'll assume that turning the key off, resets the system cpu and clears the low pressure flag.

Dave

aka