Reply
 
Thread Tools Search this Thread Display Modes
 
Old 05-05-2021, 05:09 PM   #1
Senior Member
 
City: Hendersonville, NC
Vessel Name: Hot Shot
Vessel Model: Mainship 390
Join Date: May 2012
Posts: 120
Mainship 390 prop mount?

Can someone verify If the prop uses a keyway or is it a tapered shaft? I’m trying to figure something out and the boat is far away.
__________________
Advertisement

Pluto is offline   Reply With Quote
Old 05-05-2021, 08:31 PM   #2
TF Site Team
 
Bacchus's Avatar
 
City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 5,137
Should be both.
Here's a good how to
https://marinehowto.com/lap-fitting-a-propeller/
__________________

__________________
Don
2008 MS 34 HT Trawler
"Bacchus"
Bacchus is offline   Reply With Quote
Old 05-06-2021, 05:51 AM   #3
Senior Member
 
City: Hendersonville, NC
Vessel Name: Hot Shot
Vessel Model: Mainship 390
Join Date: May 2012
Posts: 120
Thanks B. My problem is the prop is spinning freely on the shaft. My diver thinks the keyway failed but doesn’t want to remove the propeller without having a new keyway. Anyone know what size the keyway is?
Pluto is offline   Reply With Quote
Old 05-06-2021, 07:40 AM   #4
Guru
 
jleonard's Avatar
 
Join Date: Jun 2008
Posts: 4,249
Quote:
Originally Posted by Pluto View Post
Thanks B. My problem is the prop is spinning freely on the shaft. My diver thinks the keyway failed but doesn’t want to remove the propeller without having a new keyway. Anyone know what size the keyway is?
The "keyway" is already machined into both the shaft and the prop.
The "key" is what likely sheared.
If you know the shaft diameter it should be a standard size for that shaft.
You should be able to find that out via google search or by asking a prop shop.

You might want to know why it failed. Did you hit something?
__________________
Jay Leonard

New Port Richey,Fl
jleonard is online now   Reply With Quote
Old 05-06-2021, 09:34 AM   #5
Senior Member
 
City: Hendersonville, NC
Vessel Name: Hot Shot
Vessel Model: Mainship 390
Join Date: May 2012
Posts: 120
A prop shop was able to help me out. Thanks gents.
Pluto is offline   Reply With Quote
Old 05-06-2021, 10:25 AM   #6
TF Site Team
 
City: Westerly, RI
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 3,027
I would have the shaft inspected. I had to replace my shaft because the key was badly malformed and the keyway was wallowed out. I suspect it's caused by not waiting for the prop to slow before knocking it from neutral into gear. Such as going straight from FWD to REV, vice versa, or not waiting long enough.

Just my .02. I'd be concerned about the state of the keyway on the prop and shaft.
__________________

Shrew is online now   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



» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 04:01 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×