M25 Alternator Bracket Upgrade - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
 Not a Member? 
  #1  
Old 07-12-2011
Stu Jackson's Avatar
Senior Member
 
Join Date: Jul 2001
Posts: 811
Thanks: 0
Thanked 9 Times in 8 Posts
Rep Power: 14
Stu Jackson is on a distinguished road
M25 Alternator Bracket Upgrade

I thought everyone knew about this by now.

1985 Catalina 30 broken alternator brkt. - SailboatOwners.com
__________________
Stu Jackson, C34, 1986, M25 engine, Rocna 10 (22#)
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 10-18-2011
eherlihy's Avatar
Learning the HARD way...
 
Join Date: Jan 2007
Location: Boston / Ft Myers Area
Posts: 3,663
Thanks: 124
Thanked 73 Times in 72 Posts
Rep Power: 8
eherlihy will become famous soon enough
Thank you Stu!!!

However, as I posted in the Ericson Owner's Forum (long story there...), the bolts included in the kit ARE WRONG!

Quote:
Last year I installed the upgraded Alternator mounting bracket, and a new Leece-Nevile / Prestolite 90 amp alternator on my Universal M25. If you are reading this far, you probably know that the new alternator uses EXACTLY the same housing as the old 55 amp Motorola. BTW the kit is now ~$180.00

When I opened the box, I was happy to see that it included all the parts, including the Alternator mounting bolts.

I did the installation using the new bolts, but noticed that they did not seem to fit perfectly. The SAE Grade 5 pivot bolt allowed "a little" play of the alternator, and the tension bolt never seemed to fit "right." At the time I assumed that the alternator was machined so that the bolt would jam, thus preventing the bolt from loosening. The real reason is embarrassing....

I thought it strange that both of these bolts, and the nut were SAE.
031555 - 5/16NC x 1
031615 - 3/8NC x 3-1/2
031762 - Nut 3/8-16 Hex Steel Zinc

However, EVERY other fastener is Metric. I thought that Torrensen would know and include the correct bolts, however the extra play was because the bolts did not fit.

The Pivot bolt SHOULD BE a Metric M10 fastener. The tension bolt (connects the tension arm and the alternator) SHOULD BE a Metric M8 coarse thread.

I realized this because I was getting a little belt dust on the engine. After only 50 hours this summer, I thought that was unusual, or I would need to buy a lot of belts. I checked the alternator tension, and the "little" play seemed a "little" worse than it should have...

Because by now I had stripped some of the threads with the bolt that was included with the kit, I purchased a slightly longer bolt, a nut, and lock washer to use as a tension bolt. I also replaced the pivot bolt with a slightly longer M10 Fine thread bolt. It fit perfectly (no play at all). I used 2 nuts and a spring washer to jam the pivot bolt, so that it will not vibrate loose.

Lesson 1: If the components in the "kit" don't seem right to you, they are not.
Lesson 2: DO NOT USE THE ALTERNATOR MOUNTING BOLTS INCLUDED IN THE TORRENSEN KIT if they are SAE, and you have a Leece-Neville or Motorolla Alternator.
I did my upgrade in November of 2010. I addressed the bolt issue in October of 2011.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

USCG Licensed OUPV Captain, ASA 101/103/104/105 Certified Instructor - Also certified in Recreational Marine Electrical Systems
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 10-18-2011
eherlihy's Avatar
Learning the HARD way...
 
Join Date: Jan 2007
Location: Boston / Ft Myers Area
Posts: 3,663
Thanks: 124
Thanked 73 Times in 72 Posts
Rep Power: 8
eherlihy will become famous soon enough
I just looked up the bracket kit from Catalina Direct. Catalina Direct: Universal Diesel Alternator Bracket Retrofit It is the EXACT same kit as the one from Torrensen. Therefore, these bolts are incorrect as well. But, it is $20 cheaper!
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Westerbeke W 27 Alternator upgrade Sreya Niagara 11 06-25-2012 01:23 AM
Balmar Alternator Upgrade ABJ501 General Discussion (sailing related) 14 09-13-2009 12:21 AM
Westerbeke W 27 Alternator upgrade Sreya Niagara 1 10-07-2008 12:12 AM
Alternator upgrade for Westerbeke W 27 Sreya Gear & Maintenance 0 09-09-2008 09:19 AM
C36 Alternator Upgrade MarkWood Catalina 8 06-28-2007 04:27 PM


All times are GMT -4. The time now is 10:24 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.