So a little help please..!

So a quick update..
boat has been lifted, prop removed and cleaned, shaft tested for play. Nothing under the water looks faulty. So prop has been re fitted with new anode too.
Now I just need to go out this afternoon and do a water test.
No play in the coupling was noted and gear box seems ok.
There is a small knock sound from the gear box when rudder is first turned but it is not an on going noise. Apparantly this is just the gear being picked up??I will be doing an ATF change before water test.
 
colhel said:
The tightness of the coupling won't show up as play as the shaft will only likely spin under load. Check and tighten if necessary the bolts that tighten the clamp. The example I've linked to below shows nylocs and bolts (mine has Allen keys). It's these I suggest you check.
Shaft Coupling, Split Clamp On Shaft Coupling 202-258C
Click to expand...
Mine looks nothing like that. The shaft just slides in to a coupling that has no locking mechanism on it?? I've spun it and can see no fixings except for the ones that connect to the gear box! ??‍♂️
 
Okay, so there must be something more than the key to hold the shaft or when you go in reverse the shaft will get sucked out. I'm guessing, (and please anyone else step in!) the bolts on the flange could be tightening a taper. I can't see how else you'd get the shaft through the P bracket.
 
Ok Sit rep...
Just made it back to Mercurys with no issue at all. I tried all the rev range and no issue noted at all. Even managed 23 knots (not in the speed limit area) against the tide.
@colhel thank you for your input and advice. ??
 
ST840 said:
So a quick update..
boat has been lifted, prop removed and cleaned, shaft tested for play. Nothing under the water looks faulty. So prop has been re fitted with new anode too.
Now I just need to go out this afternoon and do a water test.
No play in the coupling was noted and gear box seems ok.
There is a small knock sound from the gear box when rudder is first turned but it is not an on going noise. Apparantly this is just the gear being picked up??I will be doing an ATF change before water test.
Click to expand...

Filter normally is pretty clean, but a rinse (diesel, brake cleaner) or replacement wouldn't hurt.
 
Well ok, back to square one again with this issue.
Two weeks ago we had a nice trip to Yarmouth with no issue.
today, we set off to go fishing, got to the end of the Hamble and had to turn around. No propulsion again. Engine would rev to 2500rpm and max speed was 7knts.
Slow engaging reverse too I discovered as I tried to moor up!!
 
Gearbox? Cogs stripped of teeth?

Or, one of the keys in the shaft sheared or slipped out. Perhaps the rope or whatever that started all this partially sheared a key in one of the shafts or drives and it has now gone with just friction turning the prop.

Rather clutching at straws here but just trying to think what it maybe.
 
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