Changing Prop on 2120 SC

[itguy]

I will be changing the prop on my 2120 SC with 200 HP 4-stroke. Do I need to do some sort of dry dock, or is it pretty easy to do in the water with the engine tilted up?

Also, any special tools or torque required? I will be changing out one Yamaha prop for another Yamaha prop.

Thanks.

Itguy

 

[BradV]

Special tools are a prop wrench or if you have a large selection of sockets that would work too not sure exactly the size but big. Pliers to remove the cotter pin and a replacement cotter pin. also going to need grease to put on the shaft and for the grease fitting behind the prop. you can do it in the water obviously dry dock would be easier if you can get on a raft behind the boat or turn it so the props is facing you when youre on the dock that would all be better.

 

[DaleH]

... is it pretty easy to do in the water with the engine tilted up?

Much easier in shallow water in case you drop anything overboard!

All kidding aside, I NEVER ever re-use a cotter pin unless it is a wheel I'm testing out. Even then, once proven good for the boat, I'll throw a new one in. I only use blue-colored waterproof synthetic grease for the splines ans while you're at it, check BEHIND the thrust washer for any build-up of stray monofilament fishing line.

I also take a small 8' dingy and get in the bow with all my tools, then I kneel in the bow and put the bow of the dinghy right up and under the motor. If any current, I then trim down the OB to "trap" the dinghy with the OB ... I make the swap ... trim up the OB ... and presto - all done !

 

[itguy]

Thanks, guys. No mention of torque. Not an issue?

 

[DaleH]

Thanks, guys. No mention of torque. Not an issue?

Not really, no ... snug/tight, enough to engage the castlated 'castle' nut (see below) or similar locking feature. OEM manuals sometimes list prop torque specs, but for 40+ years boating we've done as above and haven't lost a prop yet.

 

[itguy]

Thanks, Dale

Itguy

 

[jeffnick]

Good-n-snug has always worked for me. Setting the prop nut to spec should assure that everything is seated properly and no play develops on the water...not that you'd lose the prop -- just might experience a little chatter.

When I experiment with props,

I give the boat a long enough bow line that the wind/current puts the stern almost perpendicular to the dock. I can then easily change the prop from the dock without getting my feet wet.

 

[M5]

I will be changing the prop on my 2120 SC with 200 HP 4-stroke.

Itguy

My 2120 is a 2004 with the F200 HP 4-stroke.

I have the standard black 15 x 17 prop.

Fully loaded it will top WOT at 5800-5900 RPM's.

Interested in which prop you'll be switching to.

Thanks,
Kevin (M5)