Grounding M4-30? - SailNet Community
 
LinkBack Thread Tools
post #1 of 8 Old 07-02-2015 Thread Starter
Senior Member
 
Join Date: Sep 2012
Location: Dania Beach
Posts: 303
Thanks: 25
Thanked 15 Times in 15 Posts
Rep Power: 8
 
Question Grounding M4-30?

If you have a Universal M4-30 diesel: to which engine block bolt is your negative battery cable connected?

Mine is connected to the lower starter mounting bolt, which is nearly inaccessible in my install. The service manual does not suggest a particular bolt to use. I'm curious as to what others have done.

1975 Tartan 30 Competition Rig
eko_eko is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 07-02-2015
Senior Member
 
celenoglu's Avatar
 
Join Date: Dec 2008
Posts: 839
Thanks: 3
Thanked 30 Times in 29 Posts
Rep Power: 11
 
Re: Grounding M4-30?

The engine body is general negative terminal. The place of the connection will not make any difference electrically.
celenoglu is online now  
post #3 of 8 Old 07-02-2015 Thread Starter
Senior Member
 
Join Date: Sep 2012
Location: Dania Beach
Posts: 303
Thanks: 25
Thanked 15 Times in 15 Posts
Rep Power: 8
 
Re: Grounding M4-30?

Well, yes, technically. Some bolts are a better idea to use than others. I've heard that one should not use the alternator mounting bolt (possibly because it slides?).

I'm looking for places where other users have been able to successfully put a ring terminal without interfering with some other engine function, experiencing too much vibration, etc.

1975 Tartan 30 Competition Rig
eko_eko is offline  
 
post #4 of 8 Old 07-06-2015
Senior Member
 
Stu Jackson's Avatar
 
Join Date: Jul 2001
Posts: 1,167
Thanks: 0
Thanked 32 Times in 31 Posts
Rep Power: 19
 
Re: Grounding M4-30?

Quote:
Originally Posted by eko_eko View Post
..... without interfering with some other engine function, experiencing too much vibration, etc.
Everything on the engine vibrates equally.

Just find an easily accessed big bolt, and make sure it's cleaned before you attached your ring terminal.

No need to make this any harder than it need be.

Other folks may have the same engine, but access could well be completely different. The only way you'd get an answer to you specific question is to find someone with the same exact boat AND engine.

Good luck.

Stu Jackson, Catalina 34, 1986, M25 engine, Rocna 10 (22#), Maple Bay, BC, Canada
Stu Jackson is offline  
post #5 of 8 Old 07-06-2015 Thread Starter
Senior Member
 
Join Date: Sep 2012
Location: Dania Beach
Posts: 303
Thanks: 25
Thanked 15 Times in 15 Posts
Rep Power: 8
 
Re: Grounding M4-30?

I didn't want to use something like the alternator or starter mounting bolt. I found that there are several M10x1.25 threaded holes along the side of the motor, presumably for an alternate mounting scheme. I've picked up a new bolt and will be running my grounding lines there.

1975 Tartan 30 Competition Rig

Last edited by eko_eko; 07-07-2015 at 07:34 AM.
eko_eko is offline  
post #6 of 8 Old 07-07-2015
Less Senior Senior Member
 
Join Date: May 2011
Location: Bangor, Maine
Posts: 1,442
Thanks: 39
Thanked 50 Times in 50 Posts
Rep Power: 9
 
Similar to mine. What boat?
seaner97 is offline  
post #7 of 8 Old 07-08-2015 Thread Starter
Senior Member
 
Join Date: Sep 2012
Location: Dania Beach
Posts: 303
Thanks: 25
Thanked 15 Times in 15 Posts
Rep Power: 8
 
Re: Grounding M4-30?

Quote:
Originally Posted by seaner97 View Post
Similar to mine. What boat?
Tartan 30. I wanted to use a bolt that I'd have no reason to adjust other than to replace these cables, and also one that was less likely to shake loose and easier to check on.

1975 Tartan 30 Competition Rig
eko_eko is offline  
post #8 of 8 Old 07-08-2015
Less Senior Senior Member
 
Join Date: May 2011
Location: Bangor, Maine
Posts: 1,442
Thanks: 39
Thanked 50 Times in 50 Posts
Rep Power: 9
 
Sounds like you've picked the right way to go.
seaner97 is offline  
Reply

Tags
universal electric

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:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
DC/AC grounding Seascape Gear & Maintenance 13 04-03-2013 02:00 PM
Grounding fmueller General Discussion (sailing related) 3 03-19-2012 09:40 AM
Grounding the Through Hulls? rbrasi Gear & Maintenance 0 04-18-2011 02:33 PM
Grounding Coreyboy18 Electrical Systems 11 05-02-2009 11:21 AM
Mast Grounding jmedina General Discussion (sailing related) 3 08-16-2001 01:57 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome