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True Wind
Last seen: 1 day 17 hours ago
Joined: 7/15/12
Posts: 95
Alternator Bracket Broke

I was in the process of upgrading my lack luster standard 55amp alternator to a 120amp with external regulator. When I took the alternator off, this what I found. Very disappointing considering there is only 330hours on the motor. It looks like some cheap cast iron. I think I'll take it by a machine shop and see if I have a heart attack with the cost. I don't think I'll have an option as a 120amp alternator will put a serious amount of force on the bracket.

​Anyone ever had one of these machined?
 

2003 Catalina 36

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2003 Catalina 36
Catboat Willy's picture
Catboat Willy
Last seen: 12 hours 17 min ago
Joined: 12/22/14
Posts: 255

Dave;
 Regrets that this happened to you. I certainly be interested in your following up with the group and seeing how you make out at the machine shop. $$
 With today's CNC machines, it may not be as expensive as originally thought.
 Good luck with this.
 Bill

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Bill Dolan 1990 Catalina C-36 MKI - Hull #1041  'Williwaw'
Std. Rig, Walk Through, Wing Keel
M35, Oberdorfer Conversion,
Home Waters; Port Charlotte, FL
'You are never out of work if you own a boat'

 
LeslieTroyer's picture
LeslieTroyer
Last seen: 18 hours 1 min ago
Joined: 3/13/16
Posts: 490

TrueWind

be sure and let them know welding the ears on is fine rather than machining from single block.  Much cheaper.  

I hate to break it to you but you are going to be hard pressed to get a 3/8 belt to run a 120A alternator   

 

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Les & Trish Troyer
Mahalo 
Everett, WA
1983 C-36 Hull #0094
C-36 MK 1 Technical Editor. 

Commodore

 

True Wind
Last seen: 1 day 17 hours ago
Joined: 7/15/12
Posts: 95

Captain Les
I'm a few boat lengths in front of you. I've already upgraded to J10 pulleys. Just need a firm footing to hang that dang aletnator.
David :)

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2003 Catalina 36
KevinLenard's picture
KevinLenard
Last seen: 1 month 13 hours ago
Joined: 1/28/15
Posts: 138

Hm.  That looks a lot like aluminum.  A number of the parts attached to the cast iron engine block are aluminum, such as the mounting piece between the coolant pump and the engine.  Sometimes a weld is even stronger than the original metal with iron/steel, not sure about aluminum. K.

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Kevin Lenard
"Firefly"
'91 C-36 Tall Rig, Fin Keel, Hull #1120, Universal M-35 original (not "A" or "B")
CBYC, Scarborough, Ontario, Canada

True Wind
Last seen: 1 day 17 hours ago
Joined: 7/15/12
Posts: 95

I dropped it off today at a machine shop today. Waiting to get a quote on a new fabricated bracket made out of steel. Not sure I want to put that much faith in that old bracket with a new 120amp alternator.
David 

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2003 Catalina 36
LeslieTroyer's picture
LeslieTroyer
Last seen: 18 hours 1 min ago
Joined: 3/13/16
Posts: 490

Dave if I'm not doing anything else at the time I'd be glad to lend a hand/supervise.  

 

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Les & Trish Troyer
Mahalo 
Everett, WA
1983 C-36 Hull #0094
C-36 MK 1 Technical Editor. 

Commodore

 

True Wind
Last seen: 1 day 17 hours ago
Joined: 7/15/12
Posts: 95

Captain Les
​Today is travel Tuesday. Buy your tickets to South Carolina and save a few bucks. When you get here, I'll buy you a hot bag of boiled peanuts.
 
David

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2003 Catalina 36
LeslieTroyer's picture
LeslieTroyer
Last seen: 18 hours 1 min ago
Joined: 3/13/16
Posts: 490

Think I'll pass.   I miss-read your post thinking you were one of the other C36's ahead of me on the dock.    Oooops

 

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Les & Trish Troyer
Mahalo 
Everett, WA
1983 C-36 Hull #0094
C-36 MK 1 Technical Editor. 

Commodore

 

Maine Sail
Last seen: 2 weeks 6 days ago
Joined: 2/26/10
Posts: 316

Failures of these brackets is not at all uncommon, we've seen about 6 or 7 and all were broken before a better alternator was installed.. Westerbeke used to make these out of machined steel then switched to cheap cast then machined aluminum. They essentially have zero flex before failure so if the alternator foot is even off by a few thousands of an inch they can snap. Best to have a machine shop duplicate it out of steel....

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-Maine Sail

https://www.marinehowto.com/

 
Haro's picture
Haro
Last seen: 7 hours 35 min ago
Joined: 11/7/14
Posts: 256

I replaced my bracket recently with stock alternator.
I am curious if a stronger bracket is fabricated will it break the engine mount instead?

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