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Author Topic: Major incident: Strut, Prop & Shaft Electrolysis  (Read 13630 times)

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Lance Jones

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Major incident: Strut, Prop & Shaft Electrolysis
« on: May 16, 2014, 03:50:49 PM »

Two major events happened today. HELP!!!
1. While on way to pump out, it sounded like the prop shaft zinc came loose. When we arrived at our dock, the prop wrapped in the dock line.

2. Dove in and discovered:
    a) prop had corroded.
    b) prop shaft had pulled away from strut.
    c) underside of strut holding shaft was gone.

How do I fix this? And worse, how much do you think it will cost?

Parts?
« Last Edit: May 24, 2014, 01:54:28 PM by Stu Jackson »
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Lance Jones
1988  C-34 Kitty's Cat
S/N 622

Jim Hardesty

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Re: Major incident.
« Reply #1 on: May 16, 2014, 05:18:49 PM »

First thing.  If you haven't done so yet.  Check your stuffing box for leaking.  Think that I would over tighten the packing, you won't be turning the shaft till it's fixed.  I would just be quessing at a cost.
Hope the rest of your season goes better.
Jim



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Jim Hardesty
2001 MKII hull #1570 M35BC  "Shamrock"
sailing Lake Erie
from Commodore Perry Yacht Club
Erie, PA

Stu Jackson

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Re: Major incident.
« Reply #2 on: May 16, 2014, 05:28:43 PM »

Lance, we're so sorry to hear, and glad that you both are OK and safe.

The answer is to get the boat hauled asap and have the yard describe what they plan to do, make a list yourself, share it with us and see if they're missing things or doing too much.  And comment on the $#s they're giving you.

We can help you with that kinda stuff online here.

Good luck, God bless and this, too, shall pass... :thumb:
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Stu Jackson, C34 IA Secretary, #224 1986, "Aquavite"  Cowichan Bay, BC  Maple Bay Marina  SR/FK, M25, Rocna 10 (22#) (NZ model)

"There is no problem so great that it can't be solved."

Ken Juul

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Re: Major incident.
« Reply #3 on: May 16, 2014, 07:41:55 PM »

My reply on the zinc was premature.  It sounds like your marina is hot. Before you splash again have it checked out so it doesn't happen again.  The other option is that you wired something on the boat wrong.  Review any work you have done recently.
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Ken & Vicki Juul
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paule

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Re: Major incident.
« Reply #4 on: May 17, 2014, 04:07:28 AM »

Lance,
If you are having work done by a yard I would recomend Sneads Boat works excellent!!!
Paul

What amrina did you finaly go to?
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Paul & Lynn Erb
Yachta Yachta Yachta
C34 2003 #1634
Rotonda West, FL 33947

Lance Jones

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Re: Major incident.
« Reply #5 on: May 17, 2014, 04:59:23 AM »

Hey Paul,
I'm up in Shalimar.

To the rest, I have a ground wire to my starter battery combiner that had frayed and laying on the hull. Would that be the culprit?
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Lance Jones
1988  C-34 Kitty's Cat
S/N 622

Lance Jones

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Re: Major incident.
« Reply #6 on: May 17, 2014, 05:03:37 AM »

I know i'll need a replacement strut and cutlass bearing, Where can i find those? Primarily the strut as I know where to get the cutlass.
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Lance Jones
1988  C-34 Kitty's Cat
S/N 622

Craig Illman

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Re: Major incident.
« Reply #7 on: May 17, 2014, 05:36:29 AM »

Catalina Direct probably has a strut or Catalina Yachts themselves. The latter is probably closer to you.
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mainesail

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Re: Major incident.
« Reply #8 on: May 17, 2014, 06:30:57 AM »

Lance,

Sounds like a pretty serious DC leak on-board your boat. Start with bilge pump wiring then examine every wire inch by inch or hire an ABYC trained corrosion tech... DC leaks are fast and can literally sink boats...
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-Maine Sail
Casco Bay, ME
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lazybone

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Re: Major incident.
« Reply #9 on: May 17, 2014, 11:17:43 AM »

Two major events happened today. HELP!!!
1. While on way to pump out, it sounded like the prop shaft zinc came loose. When we arrived at our dock, the prop wrapped in the dock line.

2. Dove in and discovered:
    a) prop had corroded.
    b) prop shaft had pulled away from strut.
    c) underside of strut holding shaft was gone.

How do I fix this? And worse, how much do you think it will cost?

Parts?


Does your boat stay in the water year round?
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Ciao tutti


S/V LAZYBONES  #677

Ron Hill

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Re: Major incident.
« Reply #10 on: May 17, 2014, 11:57:19 AM »

Lance : I agree with Mainsail, you probably have "stray voltage" OTA!!

Do you stay "plugged into shore power" all the time you're at the dock?
  
When was the last time you had the boat out of the water and examined the running gear?
« Last Edit: May 17, 2014, 01:18:56 PM by Ron Hill »
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Lance Jones

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Re: Major incident.
« Reply #11 on: May 17, 2014, 05:10:25 PM »

I do keep her in year round and plugged in as we live aboard. I did a full inspection in Feb/Mar when she was transported here.
The actual strut look good down to where the shaft passes through it. At that point the bottom of the round piece is gone.

Could I cut the strut at that point and weld a new piece for the shaft there?
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Lance Jones
1988  C-34 Kitty's Cat
S/N 622

Stu Jackson

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Re: Major incident.
« Reply #12 on: May 17, 2014, 07:14:23 PM »

Lance, I've never heard of that, ever.  The work will require removing the old one and installing a new one.  Have you been hauled yet?
« Last Edit: May 18, 2014, 10:08:19 AM by Stu Jackson »
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Stu Jackson, C34 IA Secretary, #224 1986, "Aquavite"  Cowichan Bay, BC  Maple Bay Marina  SR/FK, M25, Rocna 10 (22#) (NZ model)

"There is no problem so great that it can't be solved."

Indian Falls

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Re: Major incident.
« Reply #13 on: May 18, 2014, 06:33:24 AM »

Shouldn't there be a lot of corrosion evidence on the prop or the shaft and the zinc?
 The strut is isolated by the rubber in the bearing. It can't be a path for current unless it comes in contact with the shaft.  Another way is the zinc moved and made contact with strut.  Is put possible that the shaft wore through the bearing and then out the bottom of the strut?
First someone loses a rudder and now this.  I'm getting worried!
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Dan & Dar
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Kyle Ewing

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Re: Major incident.
« Reply #14 on: May 18, 2014, 06:40:35 AM »

The C36 site has some good links related to strut replacement. See http://www.c36ia.com/node/1385 for one.

It seems like there were two issues: Something causing corrosion and wrapping a line around the prop. How fast was the prop spinning when wrapped?
« Last Edit: May 18, 2014, 10:08:55 AM by Stu Jackson »
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Kyle Ewing
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Belmont Harbor, Chicago
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