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11-24-2020, 03:56 PM
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#1
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Veteran Member
City: NYC
Join Date: May 2020
Posts: 31
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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
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11-24-2020, 04:33 PM
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#2
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Valued Technical Contributor
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 5,672
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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
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11-24-2020, 04:45 PM
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#3
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Guru
City: Sidney
Vessel Name: RochePoint
Vessel Model: 1985 Cheer Men PT38 Sedan
Join Date: Apr 2009
Posts: 1,608
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I would pull the shaft and take it so it could be matched exactly.
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11-24-2020, 04:46 PM
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#4
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Guru
City: Saint Petersburg
Vessel Name: Weebles
Vessel Model: 1970 Willard 36 Trawler
Join Date: Mar 2019
Posts: 2,055
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Quote:
Originally Posted by apagano
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
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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
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M/V Weebles
1970 Willard 36 Sedan Trawler
Current Location: Ensenada MX
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11-24-2020, 06:13 PM
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#5
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Guru
City: Au Gres, MI
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 10,494
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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 1/2” short, costly mistake.
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Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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11-24-2020, 06:16 PM
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#6
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Guru
City: Saint Petersburg
Vessel Name: Weebles
Vessel Model: 1970 Willard 36 Trawler
Join Date: Mar 2019
Posts: 2,055
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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  
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M/V Weebles
1970 Willard 36 Sedan Trawler
Current Location: Ensenada MX
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11-24-2020, 06:41 PM
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#7
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Guru
City: Au Gres, MI
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 10,494
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Remember that you don’t want the shaft to be too long either. If, for example, you have a 2” diameter shaft there should be no more than 2” between the front of the prop and the back of the strut. No more than 1 shaft diameter is the most you want unsupported.
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Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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11-24-2020, 07:05 PM
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#8
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Guru
City: Oconto, WI
Vessel Name: Best Alternative
Vessel Model: 36 Albin Aft Cabin
Join Date: Oct 2012
Posts: 1,633
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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
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11-24-2020, 07:10 PM
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#9
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Guru
City: Saint Petersburg
Vessel Name: Weebles
Vessel Model: 1970 Willard 36 Trawler
Join Date: Mar 2019
Posts: 2,055
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Quote:
Originally Posted by Pete Meisinger
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
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Right question Pete. Picture of my shaft being trued a couple months ago.
Peter 
__________________
M/V Weebles
1970 Willard 36 Sedan Trawler
Current Location: Ensenada MX
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11-24-2020, 07:30 PM
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#10
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Guru
City: Boston
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 1,096
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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.
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11-25-2020, 12:19 AM
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#11
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 5,982
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Apagano, did you try the split coupling?
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11-25-2020, 07:11 AM
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#12
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Guru
City: Ft Pierce
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 22,681
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Quote:
Originally Posted by Pete Meisinger
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
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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"
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11-25-2020, 01:47 PM
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#13
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 5,982
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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.
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11-25-2020, 02:49 PM
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#14
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Guru
City: Au Gres, MI
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 10,494
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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 don’t see any downside.
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If you aren’t one, there is no explanation possible.
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