Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-24-2020, 03:56 PM   #1
Veteran Member
 
City: NYC
Join Date: May 2020
Posts: 31
Prop shaft , size length and where?

Marine Trader 1977 double cabin, 40 foot, stuck in Socastee North Carolina needing a prop shaft replacement. All I know is the shaft is 1 3/4 inches. Does any one know the length for my particular boat and a supplier? Thank you in advance
__________________
Advertisement

apagano is offline   Reply With Quote
Old 11-24-2020, 04:33 PM   #2
Valued Technical Contributor
 
DavidM's Avatar
 
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 5,672
Find a boat yard with a good mechanic. He will direct you to a machine shop that can cut and finish your shaft- taper, keyway, etc. You will need a mechanic unless you are going to do the replacement yourself, so why not work with one to get your new shaft made?

In other words, you don't order a prop shaft, you get one machined to match.

David
__________________

DavidM is online now   Reply With Quote
Old 11-24-2020, 04:45 PM   #3
Guru
 
rochepoint's Avatar
 
City: Sidney
Vessel Name: RochePoint
Vessel Model: 1985 Cheer Men PT38 Sedan
Join Date: Apr 2009
Posts: 1,608
I would pull the shaft and take it so it could be matched exactly.
__________________
Cheers
Mike Barge
Sidney, BC, Canada
www.rochepoint.ca
rochepoint is online now   Reply With Quote
Old 11-24-2020, 04:46 PM   #4
Guru
 
mvweebles's Avatar
 
City: Saint Petersburg
Vessel Name: Weebles
Vessel Model: 1970 Willard 36 Trawler
Join Date: Mar 2019
Posts: 2,055
Quote:
Originally Posted by apagano View Post
Marine Trader 1977 double cabin, 40 foot, stuck in Socastee North Carolina needing a prop shaft replacement. All I know is the shaft is 1 3/4 inches. Does any one know the length for my particular boat and a supplier? Thank you in advance
Wish I had a better answer, but I believe prop shafts are custom fitted for engine configuration. As a reminder, these boats were built in locations with very low labor costs. Close tolerance manufacturing techniques were doubtful to be a priority. If it were my Willard 36 built in California in 1970, I wouldn't trust the measurement of a sistership even if it were the previous hull number and had the same engine/gear. Just not how boats were built back in the day

Your best bet is to put a measuring tape on it.

Peter
__________________
M/V Weebles
1970 Willard 36 Sedan Trawler
Current Location: Ensenada MX
mvweebles is online now   Reply With Quote
Old 11-24-2020, 06:13 PM   #5
Guru
 
Comodave's Avatar
 
City: Au Gres, MI
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 10,494
Yes, you will almost surely have to measure the old one. I doubt that you could take someone elses boat and use theirs. You could easily end up 1/2Ē short, costly mistake.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you arenít one, there is no explanation possible.
Comodave is offline   Reply With Quote
Old 11-24-2020, 06:16 PM   #6
Guru
 
mvweebles's Avatar
 
City: Saint Petersburg
Vessel Name: Weebles
Vessel Model: 1970 Willard 36 Trawler
Join Date: Mar 2019
Posts: 2,055
Pictures show clearance on both ends of my prop shaft - not a lot of play especially since coupling on engine side and line cutters on prop side are not show Might have 1-inch give or take.....maybe.

Bottom line, if I were building a boat, prop shaft would be the last piece of the drive train I'd install. First, I'd mount engine and gear, then install/align the struts, and last step would be to put a measuring tape on it to see what length shaft I needed and machine accordingly.

Measuring tape is your friend here. There is no safe alternative.

Peter Click image for larger version

Name:	Screenshot_20201124-181224.jpeg
Views:	12
Size:	38.4 KB
ID:	110507Click image for larger version

Name:	Screenshot_20201124-081527.jpeg
Views:	12
Size:	27.0 KB
ID:	110508
__________________
M/V Weebles
1970 Willard 36 Sedan Trawler
Current Location: Ensenada MX
mvweebles is online now   Reply With Quote
Old 11-24-2020, 06:41 PM   #7
Guru
 
Comodave's Avatar
 
City: Au Gres, MI
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 10,494
Remember that you donít want the shaft to be too long either. If, for example, you have a 2Ē diameter shaft there should be no more than 2Ē between the front of the prop and the back of the strut. No more than 1 shaft diameter is the most you want unsupported.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you arenít one, there is no explanation possible.
Comodave is offline   Reply With Quote
Old 11-24-2020, 07:05 PM   #8
Guru
 
Pete Meisinger's Avatar
 
City: Oconto, WI
Vessel Name: Best Alternative
Vessel Model: 36 Albin Aft Cabin
Join Date: Oct 2012
Posts: 1,633
What is wrong with your present shaft? Many can be straightened. Pull it and take it to a shop, if they can't fix it at least you can get an accurate measurement.

pete
Pete Meisinger is offline   Reply With Quote
Old 11-24-2020, 07:10 PM   #9
Guru
 
mvweebles's Avatar
 
City: Saint Petersburg
Vessel Name: Weebles
Vessel Model: 1970 Willard 36 Trawler
Join Date: Mar 2019
Posts: 2,055
Quote:
Originally Posted by Pete Meisinger View Post
What is wrong with your present shaft? Many can be straightened. Pull it and take it to a shop, if they can't fix it at least you can get an accurate measurement.

pete
Right question Pete. Picture of my shaft being trued a couple months ago.

Peter Click image for larger version

Name:	Screenshot_20201124-190931.jpeg
Views:	14
Size:	49.0 KB
ID:	110509
__________________
M/V Weebles
1970 Willard 36 Sedan Trawler
Current Location: Ensenada MX
mvweebles is online now   Reply With Quote
Old 11-24-2020, 07:30 PM   #10
Guru
 
City: Boston
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 1,096
Rent a car. Drive up to Marine Machining in Myrtle Beach. They sell props and shafts and have onsite machining.

https://www.marinemachining.com/

Have SeaTow tow your boat to Myrtle Beach, haul out facilities are available.
SoWhat is online now   Reply With Quote
Old 11-25-2020, 12:19 AM   #11
Technical Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 5,982
Apagano, did you try the split coupling?
Ski in NC is offline   Reply With Quote
Old 11-25-2020, 07:11 AM   #12
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 22,681
Quote:
Originally Posted by Pete Meisinger View Post
What is wrong with your present shaft? Many can be straightened. Pull it and take it to a shop, if they can't fix it at least you can get an accurate measurement.

pete

From his other thread.....


"Help please , advise needed quickly, i am presently cruising down ICW and am in South Carolina 30 miles north of Georgetown and my starboard prop shaft disengaged from transmission. Local mechanic informs me I need a new shaft and all hardware that goes with it. meanwhile He is trying to make a temp connection so I can steer and put my trawler in a better berth. The shaft end is worn down a couple of thousands of an inch and is slightly pitted. I am in need of advise regarding a full replacement, would I have any other options? Feedback would be appreciated. BTW my boat is a 40 Marine Trader with 2 lehman 120 engines. Thank You
Alfonse"
psneeld is online now   Reply With Quote
Old 11-25-2020, 01:47 PM   #13
Technical Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 5,982
Apagano- I got your private message stating that the mechanic did not want to use a split coupling. But did not go into detail as to why. Go into more detail. It should be a decent fix to get you down the road.
Ski in NC is offline   Reply With Quote
Old 11-25-2020, 02:49 PM   #14
Guru
 
Comodave's Avatar
 
City: Au Gres, MI
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 10,494
I am moving to split couplings, put one on last winter and going to put the second one on this winter. They are much easier to get on and off. I donít see any downside.
__________________

__________________
Boat Nut:
If you are one there is no explanation necessary.
If you arenít one, there is no explanation possible.
Comodave is offline   Reply With Quote
Reply

Tags
driveshaft, drivetrain, propeller, shaft removal

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 06:18 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
×