Boats For Sale:
Vibration |
Post Reply 
|
| Author | |
dutch-us 
Newbie 
Joined: August-19-2022 Location: Western Michiga Status: Offline Points: 12 |
 Post Options
 Thanks(0)
 Quote Reply
 Topic: VibrationPosted: November-23-2022 at 6:13pm |
|
Thank you all and it's time to fire up the garage furnace and go to work.
|
|
|
68 Mustang Wes
|
|
 |
|
|
63 Skier
Grand Poobah 
Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4293 |
Post Options
Thanks(0)
Quote Reply
Posted: November-23-2022 at 11:05am |
|
I doubt isolation is the problem, or the fix. Since you mention the vibration is at it's worst when under max load, engine/prop loaded up trying to pull up a heavy skier, I'm going to guess you will find a worn out strut bearing. Could be wrong, but agree with above that it's strut or shaft or prop.
|
|
|
|
|
dutch-us
Newbie
Joined: August-19-2022 Location: Western Michiga Status: Offline Points: 12 |
Post Options
Thanks(0)
Quote Reply
Posted: November-23-2022 at 9:48am |
|
I replaced the prop with a one inch lower pitch, because most of what I do is idle or ski.
I haven't measured play for strut condition but the bearing looks good and shaft spins with ease. I will measure for out of round but I would think the vibration would increase, with RPM, if it is bent. The previous owner did stringer work and the mounts are now sitting on aluminum angle iron which I wonder about. Are new isolators readily available? Thanks, |
|
|
68 Mustang Wes
|
|
|
|
|
Jonny Quest
Grand Poobah
Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 3032 |
Post Options
Thanks(0)
Quote Reply
Posted: November-21-2022 at 11:23pm |
|
Tim hit the main ones: 1) bent shaft; 2) strut bearing; and 3) unbalanced / damaged propeller.
You can check for "play" of the shaft in the bearing by wiggling the prop side-to-side and verifying movement of the shaft in the strut. How old is the prop? Has it been hit and "fixed"? Maybe post a photo of the prop (include the hub). You can measure for a bent shaft easy enough while the shaft is on the boat. You need a dial indicator and then attach the base of the dial indicator onto the strut. You want to check the shaft just aft of the strut. Can you provide a bit more info on your shaft alignment? JQ
|
|
|
Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
|
|
|
|
TRBenj
Grand Poobah
Joined: June-29-2005 Location: NWCT Status: Offline Points: 21213 |
Post Options
Thanks(0)
Quote Reply
Posted: November-21-2022 at 3:10pm |
|
Junk prop or bent shaft are the 2 biggest sources of vibration.
Misalignment will dampen vibration, not exacerbate it. How’s the strut bushing? |
|
|
|
|
dutch-us
Newbie
Joined: August-19-2022 Location: Western Michiga Status: Offline Points: 12 |
Post Options
Thanks(0)
Quote Reply
Posted: November-21-2022 at 2:05pm |
|
I have a 1968 Mustang C/Craft with a POLY 318. When hard throttling to pull up a heavy skier, it vibrates terribly. Once cruising, not bad. I have aligned the propeller shaft and even installed mufflers. The engine runs great.
Any ideas?
|
|
|
68 Mustang Wes
|
|
|
|
|
Post Reply
|
|
Tweet
|
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Topic Options