Shaft Coupler Leak Allison M20 Transmission

[Sadey]

My starboard transmission has a leak where the shaft coupler bolts to the transmission flange. It’s making an absolute mess slinging oil everywhere but it doesn’t seem to be draining much fluid from the transmission, dip stick reading while warm and in neutral. What is being lubricated inside that coupler?

 

[Sadey]

Never mind, I failed to search first.

 

[Boatsb]

It's lubricating everything in the engineroom

 

[SKYCHENEY]

Nothing. Its the output shaft seal that needs to be replaced. Oil is running back to the coupler and slinging off.