Spun Prop???-gctid380795

[hfxjack]

First trip out on shake down cruise after all of my issues from last year. Pulling into marina entrance just starting to come of plane and pow 5000 RPMS plus. Pulled back into neutral collected my thoughts. Put into forward good news prop engages and we move forward. First thought was I picked up some debris and prop cavitated. Slowly sped up hit 2000 RPM and pow right to 4000. Stop once more put in reverse backup to see if any debris comes out. Nothing, try one more time same result. Limp into marina back into slip look at prop looks fine. Latter went for a spin in the tender same thing happens to my 9.9. The water is full of seaweed and other debris and I did pass through two large debris fields so before I try a in water prop change I am going to mark the prop and go for a spin.

My coupling is new less than 20hrs operation. My prop is suspect. I had it serviced by a company that I am going to have a future fight with and when I got it back I suspected that it was not my prop. Looked much older and had a chip out of the hub that I did not remember having. But no proof. So over the winter I once again had the prop inspected by another company. They reported it to be OK but was old and showed signs of a lot of corrosion. It was on my list to replace but after all of the money I spent on this boat over the past two years it was going to have to wait. I guess not anymore.

So to make me feel better!! Is it possible that you can spin the coupler? So that it would work at low speed and not at high speed. My thoughts were it works or doesn't no in between. My summer vacation depends on your answer guys so be gentle.

[2850Bounty]

The Merc guys can varify this, but I don't think that the BIII props use an isolated inner hub. IOW, no rubber hub that would become spun.



The engine drive couplers can go bad, and it's often the splines that go from misalignment.

I believe once they go, you'll loose all.

But again, the Merc guys need to chime in on this.

.

[Guest]

From what I know about couplers they can fail in two basic ways. They can lose the teeth or splines that engage the input shaft of your outdrive. That is how mine failed. And in my case I was dead in the water with no propulsion whatsoever. Or the rubber part of the coupler that connects the center spline shaft to the outer ring can fail in much the same way a prop is spun. In this case you may have some slow speed capabilities but when more power is applied the rubber holding the inner and out metal parts together will allow slippage. Sometimes you can smell the rubber melting in the engine compartment as it slips around the inner and outer metal rings.

Hope this helps.

[hfxjack]

Sorry Guys it is a BII drive

[hfxjack]

2859er wrote:
From what I know about couplers they can fail in two basic ways. They can lose the teeth or splines that engage the input shaft of your outdrive. That is how mine failed. And in my case I was dead in the water with no propulsion whatsoever. Or the rubber part of the coupler that connects the center spline shaft to the outer ring can fail in much the same way a prop is spun. In this case you may have some slow speed capabilities but when more power is applied the rubber holding the inner and out metal parts together will allow slippage. Sometimes you can smell the rubber melting in the engine compartment as it slips around the inner and outer metal rings.

Hope this helps.

I was afraid you were going to say that. Did not smell rubber but then I did not open the hatch either

Today is the day

[hfxjack]

Marked prop and went for sea trial. Got up on plane ran down the channel, did a hard 180 then backed off so that I was just just planning. No issues. Came back to marina checked the prop and it had slipped.

Replaced with spare.

[Guest]

A new prop is cheaper and easier to replace than a coupler. Looks like you had the better of the two potential issues.

[hfxjack]

Thanks I feel better already. I would have been happier with debris on my leg and simple cavitation. That way I would not have to be sitting here waiting for low tide so I can retrieve the bushing I dropped over the side.