No B3 Propeller Spin on Starboard Outdrive

[BirdieNumNum]

2000 310 with twin 5.7s/B3s with 400 hours on each. Started up both motors, had propulsion from both outdrives when motoring through the no wake zone, powered up to get on plane and heard an odd noise. Starboard motor RPMs jumped way up and the boat slowed down. I put everything in neutral. The starboard outdrive propeller would not spin when I engaged the throttle. A marine mechanic is going to look at it this week. I don't think I hit anything or wrapped anything around the propeller. Speculations??

 

[stg099]

Shift cable broke or disconnected
Coupler - Likely would have smelled bit letting go (burnt rubber)
Less likely could be an issue with the drive itself

 

[scoflaw]

cone clutch or coupler

 

[Soulshine]

I don’t know why coupler failure is said to be accompanied by the burning rubber smell.

When the coupler fails, the sacrificial, internal aluminum splines abruptly fail and the drive shaft loses engagement. As wear becomes too severe, play develops between the male and female splines leading to failure.

This is often preceded by vibration. No heat is generated during this failure, which takes a split second and no rubber burns.

Abrupt loss of thrust is a spun prop hub or coupler failure.

The prop will most likely work again at lower load, but if the coupler is gone, thrust is lost in all RPM ranges.

Cable failure is a good possibility as well.