Can anyone identify this part? Why is this on my boat?

[EdRex]

Long story short...(I'll do my best)

Been re-habing an '87 bayliner capri 1700 for the past year or so. Sat for 10 years in a barn at my folks place.

Have replaced:

Water pump kit+impeller
fuel pump diaphragm
complete carb rebuild
gas line from tank to motor
lower end fluid
starter solenoid
starter relay
battery
plugs

First day on the lake, she took off like a bat out of hell (44 mph, really?). Idle smoothed out by the afternoon. Starts and idles like a dream.

Sometime later in the day, I smash the throttle, and I'm lucky to hit 25 mph. And there she sits. Starting and idling smoothly, but no oomph at WOT.

When I pulled her out of the water I noticed this:

I pulled up the exploded diagram of the prop assembly, and didn't see anything about that funky washer/spacer behind the prop nut. It spins freely and doesn't seem to be doing anything. There's also about 1/3" to 1/2" of play in the prop on the shaft.

I'm a chef, not a mechanic, what's wrong here?

 

[SweeperForce]

Re: Can anyone identify this part? Why is this on my boat?

I looks to me like your missing the spline washer. That would account for the play on your prop shaft. Here is a picture of mine for comparison.


Tom

 

[jason32038]

Re: Can anyone identify this part? Why is this on my boat?

Dude that prop nut is barely hangin on by a thread. Something isn't right maybe somebody more experienced can help you out but I wouldn't run it until you figure it out.

 

[hoofbite]

Re: Can anyone identify this part? Why is this on my boat?

Dude that prop nut is barely hangin on by a thread. Something isn't right maybe somebody more experienced can help you out but I wouldn't run it until you figure it out.

Agreed something ain't right there those tabs on that washer are supposed to be bent down on another sort of washer to keep it from having any play? I'm no expert but I wouldn't take that thing out until someone with a little more knowledge can help you out

 

[jason32038]

Re: Can anyone identify this part? Why is this on my boat?

Is the prop on backward? Try to flip it.

 

[jayjones72]

Re: Can anyone identify this part? Why is this on my boat?

Jason is right!Prop is backwards

 

[reelfishin]

Re: Can anyone identify this part? Why is this on my boat?

It looks to me to be one of three things, either the prop or the attaching hardware is wrong, the prop and washers are assembled wrong, or your missing a washer or spacer.

That prop don't use that style washer, it should have a castle nut and cotterpin. Is the prop correct for the motor? Is the thrust washer behind the prop in place? Is the prop new to that motor?

 

[roscoe]

Re: Can anyone identify this part? Why is this on my boat?

Hardware is wrong.
Prop is backwards.
Possibly not even the right prop for the motor.

So now when you throttle up, do the rpm's go to wot, or do the rpm max out at 2500-3000 rpm?

 

[roncoop75]

Re: Can anyone identify this part? Why is this on my boat?

Jason is right!Prop is backwards

I disagree. Look at sweepers pic. Unless he's spinning counter clockwise the prop is on the right way.

Edit: Add the fact that it's flared at the rear like most prop hubs, you couldn't even turn it around and install it that way.

 

[Frank Acampora]

Re: Can anyone identify this part? Why is this on my boat?

While it looks correct, Force semi-cleaver made by Michigan Wheel, I think you may have the wrong prop for that lower unit, OR perhaps the thrust washer broke. Notice that the prop nut is put on backwards to try to secure it from spinning off--The nylock portion is threaded on the shaft first. Perhaps the nut is the wrong thread size. It should spin all the way onto the threads with the nylock portion also engaging the outer couple of threads

The washer is a Mercury part and fits into a Mercury hub. Bending down the tab(s) keeps the nut from backing off, but in your case, it does nothing.

You have prop free play on the shaft because: (If the prop is indeed the correct one)

1. The nut is not run down all the way
2. there is no spacer or washer on the nut end of the prop
3. POSSIBLY--the thrust washer on the prop shaft is missing

Agreed: DO not run the engine again without correcting prop mounting--you have a very real danger of losing the prop.

A broken or missing thrust washer will allow the prop hub to bear against the lower unit case, wearing the case and lowering speed. SO: be certain to check this.

 

[jerryjerry05]

Re: Can anyone identify this part? Why is this on my boat?

The nut is a Force product.The prop is right.Your missing the Force splined washer and spacer.Take the prop off and see if it has a thrust hub.Post a pic.
Someone put a Mercury tab washer on it.Don't run it.Contact me I have the stuff you need.J

 

[EdRex]

Re: Can anyone identify this part? Why is this on my boat?

And the winner is...JerryJerry05! Thanks to all for the advice. I must be making some headway, because not only did I have to put a new thrust washer on, but I discovered that someone had tried to put in an extra spacer in front of the prop that kept the whole assembly from fitting properly in the first place.

I took her out on the water today...but, unfortunately, while that repair was critical, it wasn't the issue that was causing my lack of power. Sounds like it's time to start another thread...