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04-22-2018, 08:14 AM
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#1
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Veteran Member
City: East New Market
Join Date: Jul 2017
Posts: 35
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MT34 Dual Cabin Shaft Log Replacement
Well I've endeavoured to replace the failing/leaking shaft log on my Marine Trader 34. The constant leaking in this area has bothered me since I obtained the boat a couple of years ago. I began by cutting an access hole in the floor of the aft head shower pan and enlarged the hatch under the aft cabin companionway steps.
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04-22-2018, 08:28 AM
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#2
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Veteran Member
City: East New Market
Join Date: Jul 2017
Posts: 35
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04-22-2018, 09:31 AM
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#3
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Veteran Member
City: East New Market
Join Date: Jul 2017
Posts: 35
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At this point I'm contemplating a temporary repair by cutting back and sleaving the shaft log with a bronze tube machined to appropriate dimensions. I had to expose more of the shaft log to cut it back and make sleave. What I found is more pitting and holes. So decision to pull shaft log is reality now.
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04-22-2018, 09:46 AM
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#4
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Veteran Member
City: East New Market
Join Date: Jul 2017
Posts: 35
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To pull the shaft log I removed the stearn bearing hanger bolts. Then inserted pry bars between the stearn bearing flange and the aft face of the keel. I dont know at this point how this is assembled. I found the stearn bearing housing was threaded onto the aft end of the shaft log. I managed to get it pulled aft about an inch with pry bars. I then ran a come-a-long from the stearn bearing housing to a tree that was behind the boat. I would apply pressure with the come-a-long and then persuade with a large hammer.
I am forgetting to mention that I had the boat hauled for the winter and have already removed rudder and prop shaft prior to this. I was replacing the swim platform due to an unfortunate accident last fall involving a storm, broken dock lines and a bulkhead. That is another large project, probably due a different thread.
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04-22-2018, 10:21 AM
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#5
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TF Site Team
City: Jacksonville
Join Date: Nov 2008
Posts: 11,683
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What a project. Thanks for posting.
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04-22-2018, 10:47 AM
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#6
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Guru
City: Mississippi
Vessel Name: ADAGIO
Vessel Model: CHB Present 42 Sundeck
Join Date: Jul 2014
Posts: 920
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Quite a project! What year was your boat built?
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04-22-2018, 10:53 AM
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#7
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Veteran Member
City: East New Market
Join Date: Jul 2017
Posts: 35
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Built in 1974
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04-22-2018, 11:06 AM
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#8
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Guru
City: Chocowinity NC
Vessel Name: My Yuki
Vessel Model: 1973 Marine Trader 34
Join Date: Nov 2007
Posts: 637
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Josh, you have my sympathy. I’m a former owner of a 1973 MT34 and went thru the same exercise a few years back. Very frustrating since the first yard that worked on it really didn’t solve the problem and it took a second visit to a more qualified yard to fix it. They wound up putting in a fiberglass replacement shaft log. It was a project well beyond my capabilities, but good wishes for your successful solution of the problem.
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04-22-2018, 01:01 PM
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#9
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Guru
City: Sarasota,FL/Thomasville,GA
Vessel Name: Steppin Stone IV
Vessel Model: Marine Trader Kelly Trawler 46
Join Date: Jul 2013
Posts: 1,815
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Thanks for sharing what a job!!!!
__________________
Alan
Skype roatan63
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04-22-2018, 01:44 PM
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#10
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Guru
City: NARBONNE
Vessel Name: 'Snow Mouse.'
Vessel Model: BROOM FLYBRIDGE 42.
Join Date: Apr 2014
Posts: 1,733
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I don't envy you your task but in my humble opinion its not a job to be skimped and the only standard on such a critical part of your boat is perfection.
Near enough is not good enough.
Depending on your pocket and the rest of the installation would a 7degree down angle gearbox be a worthwhile proposition to prevent a re-occurrence and lower the engine profile ?
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04-22-2018, 05:24 PM
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#11
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,191
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Good luck with your project. Looks like you have a handle on it.
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04-22-2018, 06:14 PM
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#12
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Senior Member
City: Lutz
Join Date: Jan 2016
Posts: 473
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My 1982 MT DC under previous owner had shaft log FG tube actually come loose ! In 2014 he had it repaired/replaced in Beufort SC Yard at a cost of $6400! He was enroute from Maine to South Florida.
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04-23-2018, 12:01 AM
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#13
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Senior Member
Join Date: Nov 2011
Posts: 392
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Quote:
Originally Posted by Irish Rambler
I don't envy you your task but in my humble opinion its not a job to be skimped and the only standard on such a critical part of your boat is perfection.
Near enough is not good enough.
Depending on your pocket and the rest of the installation would a 7degree down angle gearbox be a worthwhile proposition to prevent a re-occurrence and lower the engine profile ?
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Tough sledding. I had to replace my 2" stainless shafts on my 43 OA many years ago because boat had not been run in a year (prior owner). Packing could not seal because shaft pitting at only that location would eat the packing in a few hours. $20,000 repair in 2004 +/-
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04-23-2018, 12:03 AM
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#14
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Senior Member
Join Date: Nov 2011
Posts: 392
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Quote:
Originally Posted by Irish Rambler
I don't envy you your task but in my humble opinion its not a job to be skimped and the only standard on such a critical part of your boat is perfection.
Near enough is not good enough.
Depending on your pocket and the rest of the installation would a 7degree down angle gearbox be a worthwhile proposition to prevent a re-occurrence and lower the engine profile ?
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Might be a good time to add tangible coupling. Only a few hundred $$$. Could save a tranny/engine.
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04-23-2018, 06:46 AM
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#15
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Senior Member
City: Anchor Pointe, Ohio
Vessel Name: Sea Moose
Vessel Model: 1976 34' D/C Taiwanese Trawler
Join Date: Oct 2007
Posts: 360
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I went through this on my 76 MT 34 about six years ago now, I had help it’s a huge job by oneself, very impressive. What was your keel filled with? Mine was full of river gravel, under the aft cabin sole is concrete.
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04-23-2018, 12:05 PM
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#16
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Senior Member
Join Date: Nov 2011
Posts: 392
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Quote:
Originally Posted by SeaMoose
I went through this on my 76 MT 34 about six years ago now, I had help it’s a huge job by oneself, very impressive. What was your keel filled with? Mine was full of river gravel, under the aft cabin sole is concrete.
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"frangible shaft coupling" sacrificial, it will shear and save your tranny/ engine if your prop hits something.
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04-23-2018, 06:58 PM
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#17
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Veteran Member
City: East New Market
Join Date: Jul 2017
Posts: 35
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Quote:
Originally Posted by SeaMoose
I went through this on my 76 MT 34 about six years ago now, I had help it’s a huge job by oneself, very impressive. What was your keel filled with? Mine was full of river gravel, under the aft cabin sole is concrete.
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I found both areas filled with a concrete gravel mixture. The top 1" in the keel area had fallen apart probably due to age and leaking seawater constantly keeping it wet . I chiseled out all that was loose and have filled with thickened epoxy and have begun the fiberglass repairs.
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04-23-2018, 07:00 PM
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#18
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Veteran Member
City: East New Market
Join Date: Jul 2017
Posts: 35
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Quote:
Originally Posted by MVDarlin
"frangible shaft coupling" sacrificial, it will shear and save your tranny/ engine if your prop hits something.
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Thanks for the suggestion, what brand of coupling would you suggest? Seems like this would be a good improvement with everything disassembled.
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04-23-2018, 07:04 PM
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#19
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Veteran Member
City: East New Market
Join Date: Jul 2017
Posts: 35
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Quote:
Originally Posted by Irish Rambler
I don't envy you your task but in my humble opinion its not a job to be skimped and the only standard on such a critical part of your boat is perfection.
Near enough is not good enough.
Depending on your pocket and the rest of the installation would a 7degree down angle gearbox be a worthwhile proposition to prevent a re-occurrence and lower the engine profile ?
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Thank you for the insight, unfortunatly I rebuilt the engine bedding and the Paragon gear only a couple years ago. I do intend to do the best I am able and not skimp on any part of the new shaft log installation. I will be posting progress pictures along the way.
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04-23-2018, 10:21 PM
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#20
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Senior Member
City: Anchor Pointe, Ohio
Vessel Name: Sea Moose
Vessel Model: 1976 34' D/C Taiwanese Trawler
Join Date: Oct 2007
Posts: 360
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Thanks Josh. My issue was the aft coupling, which we rebedded. Left the gravel in there, filled the small void with foam building up a cloth plug to close the hole fwd of the coupling we made.
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