Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-07-2018, 04:28 AM   #1
Lieutenant
 
Join Date: Mar 2018
Location: B.C. Canada
Posts: 97
Default Came out of gear??

Need some thoughts from the pros. I was out on the lake today pulling the kids on the tube and everything was going well until coming out of a starboard turn (levelling the boat by turning to port) it “came out of gear” Rpm didn’t jump but I was throttling back slightly during the turn and the boat just stopped like I pulled it out of gear. Pulled it into neutral and back into forward gear and it engaged normally, tried fwd/reverse all worked well after that.

There was no noise and no vibration that accompanied the sudden stop, wasn’t running the boat hard (other than pulling a tube)

Question: if I hit something, would a prop hub or engine coupler spin and then hook up again after? And any other thoughts.

Thanks!!!


Sent from my iPhone using Tapatalk
__________________

__________________
Kellen

2000, 2100SR 5.7 Alpha 1 Gen 2
Overboard is offline   Reply With Quote
Old 08-07-2018, 11:48 AM   #2
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 6,441
Default

Typically when a prop or coupler spins the rpms jump up and the boat slows down. There is still enough friction to maneuver the boat up to about 2000 rpm then it will start slipping. Several years ago I made a 2 hour trip with a spun prop at 8mph to get home. Had a spare prop but not the right wrench for the Brave 2 nut, that was corrected by the next outing.

Even if the clutch disengaged the rpms should go up, maybe since you were throttling down it wasn't as obvious.

How fast and how long did you operate the boat after this happened?
__________________

__________________
Mike
mmwjr is offline   Reply With Quote
Old 08-07-2018, 12:27 PM   #3
Lt. Commander
 
Join Date: Dec 2015
Location: Florida
Posts: 128
Default

+1. All would usually be accompanied by increased rpm. Once the load is off the engine increase in rpm would be pretty fast and easily noticed.
Was this a tight turn and possibly cavitation?
Prop lost bite, but was still in gear?
jparsons121 is offline   Reply With Quote
Old 08-07-2018, 01:06 PM   #4
Commander
 
jrsick's Avatar
 
Join Date: Oct 2011
Location: Chesapeake, VA
Posts: 256
Default

Is everything running right now?
I had similar situation that I believe was caused by the prop partially/completely coming out of the water. There was an rpm surge followed by some strange sounds.
That's the thing about sitting next to your engine; you hear everything.
__________________
2006 Bayliner BR205
A1 Gen 2 1.47
5.0 carb engine
jrsick is offline   Reply With Quote
Old 08-07-2018, 02:01 PM   #5
Moderator

 
Join Date: Apr 2008
Posts: 4,166
Default

Silly but......any chance you simply knocked the shifter with your elbow?
shrew is offline   Reply With Quote
Old 08-07-2018, 11:00 PM   #6
Lieutenant
 
Join Date: Mar 2018
Location: B.C. Canada
Posts: 97
Default

Quote:
Originally Posted by mmwjr View Post
Typically when a prop or coupler spins the rpms jump up and the boat slows down. There is still enough friction to maneuver the boat up to about 2000 rpm then it will start slipping. Several years ago I made a 2 hour trip with a spun prop at 8mph to get home. Had a spare prop but not the right wrench for the Brave 2 nut, that was corrected by the next outing.



Even if the clutch disengaged the rpms should go up, maybe since you were throttling down it wasn't as obvious.



How fast and how long did you operate the boat after this happened?

I agree Mike that as I was throttling down when it happened and as soon as I felt “slack” in my forward momentum I pulled back right away which may have made an RPM jump harder to hear in the moment and much less profound (had the music up for the tubers as well so engine noise was drowned out a bit).


Sent from my iPhone using Tapatalk
__________________
Kellen

2000, 2100SR 5.7 Alpha 1 Gen 2
Overboard is offline   Reply With Quote
Old 08-07-2018, 11:03 PM   #7
Lieutenant
 
Join Date: Mar 2018
Location: B.C. Canada
Posts: 97
Default

Quote:
Originally Posted by shrew View Post
Silly but......any chance you simply knocked the shifter with your elbow?


I was actually throttling down when it happened and immediately after thought it may have been cavitation so before going all the way to neutral I pushed the throttle foreword a bit to see if the boat would surge ahead and all I got at that point was an RPM surge with no forward movement or any other audible sound (music was off at that point).


Sent from my iPhone using Tapatalk
__________________
Kellen

2000, 2100SR 5.7 Alpha 1 Gen 2
Overboard is offline   Reply With Quote
Old 08-07-2018, 11:07 PM   #8
Lieutenant
 
Join Date: Mar 2018
Location: B.C. Canada
Posts: 97
Default

Jparsons121 & Jrsick

Sorry guys, see my reply to shrew,


Sent from my iPhone using Tapatalk
__________________
Kellen

2000, 2100SR 5.7 Alpha 1 Gen 2
Overboard is offline   Reply With Quote
Old 08-08-2018, 03:51 PM   #9
Moderator

 
Join Date: Apr 2008
Posts: 4,166
Default

You could, conceivably have a condition where you chop the throttle fast enough that the engine RPM's are slower than expected for the speed being carried by the hull. Then when you advance the throttle, the prop can't bite into water that is travelling past it faster than it is spinning.

In other words, like trying to peddle a bike down hill in first gear. You're peddles are rotating, but the geared speed is slower than the speed of the wheels, creating that 'free wheeling' situation.

Something similar could be occurring when you attempted to advance the throttle again.
shrew is offline   Reply With Quote
Old 08-08-2018, 07:16 PM   #10
Lieutenant
 
Join Date: Mar 2018
Location: B.C. Canada
Posts: 97
Default

Quote:
Originally Posted by shrew View Post
You could, conceivably have a condition where you chop the throttle fast enough that the engine RPM's are slower than expected for the speed being carried by the hull. Then when you advance the throttle, the prop can't bite into water that is travelling past it faster than it is spinning.

In other words, like trying to peddle a bike down hill in first gear. You're peddles are rotating, but the geared speed is slower than the speed of the wheels, creating that 'free wheeling' situation.

Something similar could be occurring when you attempted to advance the throttle again.


Interesting, I had not considered this, thank you Shrew. I will be out hopefully before the weekend to jump in and pull the prop to look at the hub, I will post my findings.


Sent from my iPhone using Tapatalk
__________________

__________________
Kellen

2000, 2100SR 5.7 Alpha 1 Gen 2
Overboard is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 02:36 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2018, vBulletin Solutions, Inc.