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Alternator adjustment bracket

rukidn

.
Apr 23, 2012
133
Catalina 310 258 Sandusky, OH
I've just replaced my failed OE Mando alternator with the Compass Marine CMI-72-IR same frame size unit. The adjustment arm was marginal before and definitely won't work with the new alternator. Has anyone found an available bracket that works to swing the alternator farther away from the engine, but not too far? Belt will of course need to be longer, so any suggestions on the bracket + belt combo are appreciated.

The photo shows the alternator folded in as tight as possible. It will be better to get it away from the engine a bit.

Thanks in advance. /Ed
 

Attachments

Ward H

.
Nov 7, 2011
2,868
Catalina 30 Mk II Barnegat, NJ
Have you gone back top Compass Marine? If there is a solution he will have it.
 

rukidn

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Apr 23, 2012
133
Catalina 310 258 Sandusky, OH
I planned to email them, but wanted to start with the Forum first.
 
Feb 6, 1998
11,349
Canadian Sailcraft 36T Casco Bay, ME
There are many options here:

Option #1 This is how Beta Marine does it. All it requires is a small piece of 1/4" thick X 1" bar stock steel (any home center should have it) and no machine shop is necessary. Just clamp your existing arm to the new steel and use it as a template to drill the two mounting holes. Cut & shape is all you do. You then place the alt approx where you want it, hold the UAA up and bolt it to the alt ear then mark where the hole for the UAA needs to be then remove it and drill that hole.. You're only drilling three holes and spending $37.00 on the Balmar UAA.. You will usually need a spacer at the alt ear end but this should now be about 1/4". The UAA Balmar UAA or UBB arm makes this job easy.



Option #2 Or you can make an entire custom arm:


We prefer to see the alt with a slightly longer belt and moved out a bit into cooler air rather than crammed in behind a hot manifold..

P.S. Make darn sure the alt foot fits snugly between the ears of that OE bracket as they are cast aluminum, very brittle, and we've seen a lot of them crack. On Westerbeke engines these brackets are billet machined steel. No idea why they thought it would be a good idea to make them out of cast aluminum on this engine.
 

KZW

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May 17, 2014
738
Catalina 310 #307 Bluewater Bay, FL
Regarding the picture of the custom arm in Mainsail's post: There may not be clearance for this arm / alternator on the C-310 engine housing. There is very little room on the port side of the Universal engine in the C-310. As shown, I don't think it will fit.
Measure carefully!!!
 

rukidn

.
Apr 23, 2012
133
Catalina 310 258 Sandusky, OH
Thanks. Yes I know it is tight. UAA arm just arrived and I know I'll need to shorten significantly. Essentially I need arm raised vs. the old one to increase swing radius. Alternator needs to move both up and over, but with the steps, there is limited space to port. I hope to go to boat this weekend to begin mods. Will keep you all posted