Gear Lube leaking from Prop

if you are happy with current propeller then take prop off lower unit and look on the backside of the prop..it should show size and pitch close to center

There are videos all over YouTube that cover this subject quite nicely.
winterizing an outboard motor YouTube

two seals on the prop shaft.fishing line is deadly on these seals.take it to a shop that has the tools to do the job.

If it shifts into gear and functions ok until you start to accelerate then revs up without going anywhere it is most likely the hub in the propeller. If so try another prop or have a prop shop rehub yours.

If it is the gear case jumping out of gear usually it is a more abrupt event, feels like you hit something. Also check the gear lube by tilting the motor down and unscrewing the drain screw from the gear case. Let a couple of drops come out. Should be clean oil, if old it will be black and have a strong odor. It should not have any water or metal filings in it. If milky there is water mixed with the oil.

Either it's not going into gear properly or bush in propellor is faulty

to replace it take to a press to get old one out and to replace or take to a prop shop !

In the hub of the propeller is a rubber bush that stops damage to the shafts and g/box if something is struck with the prop.These bushes do give way and are repairable.See your local boat shop or look for a specialist propeller shop.Probably the latter as the boat shops sends the props to them anyway.Its called the propeller hub bush or just the prop bush.Just take the prop into them and all will be good.Hope this helps you

water prop? if your talking about the Propeller that rotates to propel the boat. only replace it if fins are missing. Aluminum and stainless steel propellers can be rebuilt. If your talking about the water pump impeller. the answer is yes. its rubber and should be replaced seasonly

Yes the prop shaft seal needs to be replaced.Do this sooner than later as water will get into the lower g/box.Sometimes they wear out or fishing line is a bad culprit.Its not a big job but it really needs to be done.The oil will also need replacing.Hope this helps

Not really sure what is wrong.Do all the gears work?Does the motor rev properly.Did you change the height of the motor.If the motor etc. are all ok and the motor cavitated at high speed,you may have spun the bush in the propeller hub.The symtoms are,everything works ok but the boat can rev but will have very little forward propulsion.If this is it,the prop needs to come off and taken to be rebushed.The bush stops major damage to the g/box if the prop strikes something.Hope this helps