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12-01-2020, 04:19 PM
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#1
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Member
City: Middletown, NJ
Vessel Name: Sea Shanty
Vessel Model: 1999 Mainship 350
Join Date: May 2020
Posts: 20
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Rudder Stuffing Boxes
Greetings,
I own a 1999 350 Trawler. This photo from the 390 owners manual I downloaded from this site (thanks!) accurately depicts what I have on my boat. Can anyone here specifically identify the manufacturer of these rudder components? Is that important to know before repacking?
I don't see any evidence of water when the boat is at the berth but all the bronze is lightly corroded a dry, light green. I don't know when or if the rudder packing has ever been replaced (my ownership only one year). I'd like to go ahead and repack before re-launching in the spring.
I've already seen the recommendations for the GFO packing and plan to use it. Care to offer any advice or cautions? Is there anything else you would do on your rudder system at re-pack time?
Thanks,
Adam
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12-01-2020, 05:11 PM
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#2
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Senior Member
City: Port Orchard, WA
Vessel Name: Isobel K
Vessel Model: 37' Custom Pilothouse
Join Date: Oct 2007
Posts: 423
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I just performed this job in the water for the first time since 2002, when I bought the boat.
The only criteria is the size or thickness of the packing.
I disassembled mine to measure, bought the GFO & replaced with the same number of rings.
remember to offset the cuts in the rings.
In my case, there was very little water when I took it apart.
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12-01-2020, 06:11 PM
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#3
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TF Site Team
City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 7,808
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Adam,
If you search the MS parts photo links in the sticky at the top of the M-MS builders section and find what looks like your parts the photos give the supplier MS purchased from.
That said, knowing the source may not be al, that important.
I think all you need is to accurately measure the shaft dia and the ID of the packing housing to determine the size of the packing needed.
__________________
Don
2008 MS 34 HT Trawler
"Bacchus"
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12-01-2020, 06:16 PM
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#4
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,131
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An easy way to measure the size of the stuffing is using drill bits. Find the one that fits in and isn’t loose and that is the packing material size.
__________________
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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12-02-2020, 06:38 AM
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#5
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Member
City: Middletown, NJ
Vessel Name: Sea Shanty
Vessel Model: 1999 Mainship 350
Join Date: May 2020
Posts: 20
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Quote:
Originally Posted by Comodave
An easy way to measure the size of the stuffing is using drill bits. Find the one that fits in and isn’t loose and that is the packing material size.
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Brilliant Comodave! Exactly the kind of tip I can use.
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12-02-2020, 06:48 AM
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#6
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Member
City: Middletown, NJ
Vessel Name: Sea Shanty
Vessel Model: 1999 Mainship 350
Join Date: May 2020
Posts: 20
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Wow! What a resource!
Bacchus, where do you find the time?
-Adam
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12-02-2020, 06:08 PM
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#7
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TF Site Team
City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 7,808
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Quote:
Originally Posted by AdamC
Wow! What a resource!
Bacchus, where do you find the time?
-Adam
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Its been a long time effort and others here and the old Yahoo site provided info and inspiration.
Its a whole lot easier to post info and point others to it than look it up and retype posts so some selfish interests. Bottom line I like sharing info and paying it forward for those that have helped me.
And ultimately Dave had the easy and simple answer!
__________________
Don
2008 MS 34 HT Trawler
"Bacchus"
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12-02-2020, 06:36 PM
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#8
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Veteran Member
City: Longboat Key
Join Date: Jun 2014
Posts: 74
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Quote:
Originally Posted by AdamC
Greetings,
I own a 1999 350 Trawler. This photo from the 390 owners manual I downloaded from this site (thanks!) accurately depicts what I have on my boat. Can anyone here specifically identify the manufacturer of these rudder components? Is that important to know before repacking?
I don't see any evidence of water when the boat is at the berth but all the bronze is lightly corroded a dry, light green. I don't know when or if the rudder packing has ever been replaced (my ownership only one year). I'd like to go ahead and repack before re-launching in the spring.
I've already seen the recommendations for the GFO packing and plan to use it. Care to offer any advice or cautions? Is there anything else you would do on your rudder system at re-pack time?
Thanks,
Adam
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All clean and dry...looks great.
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12-02-2020, 06:54 PM
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#9
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Guru
City: Here
Join Date: Sep 2012
Posts: 2,940
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Quote:
Originally Posted by AdamC
Greetings,
I own a 1999 350 Trawler. This photo from the 390 owners manual I downloaded from this site (thanks!) accurately depicts what I have on my boat. Can anyone here specifically identify the manufacturer of these rudder components? Is that important to know before repacking?
I don't see any evidence of water when the boat is at the berth but all the bronze is lightly corroded a dry, light green. I don't know when or if the rudder packing has ever been replaced (my ownership only one year). I'd like to go ahead and repack before re-launching in the spring.
I've already seen the recommendations for the GFO packing and plan to use it. Care to offer any advice or cautions? Is there anything else you would do on your rudder system at re-pack time?
Thanks,
Adam
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Both ABYC and the largest shaft manufactuer, Western Branch Metals advise against GFO packing as it contains graphite which can cause galvanic corrosion of the shaft.
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12-02-2020, 07:20 PM
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#10
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,131
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Quote:
Originally Posted by bill.kimbell
All clean and dry...looks great.
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That photo isn’t his boat, it was from the owners manual...
__________________
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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12-02-2020, 07:22 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: 21,131
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Our boat had Duramax packing in it when we bought the boat. It doesn’t even drip, underway or stationary. So I went with it when I rebuilt our port stuffing box. And will pack the starboard stuffing box with it this winter when I rebuild that box. The shaft on the port side looked brand new where the stuffing is.
__________________
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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