Reply
 
Thread Tools Search this Thread Display Modes
 
Old 05-28-2020, 04:21 PM   #1
Guru
 
City: Bayfield, WI
Vessel Name: Gopher Broke
Vessel Model: Silverton 410 Sport Bridge
Join Date: Sep 2013
Posts: 806
Tach question

As I've been learning about tach calibration, I've noticed that some operate with a mechanical take-off & variable ratio alternator pickup and others with a magnetic pickup.

Simple question I'm sure, but how do I know which mine is?

Thanks
BD
__________________
Advertisement

BDofMSP is offline   Reply With Quote
Old 05-28-2020, 07:14 PM   #2
Guru
 
rgano's Avatar
 
City: Southport, FL near Panama City
Vessel Name: FROLIC
Vessel Model: Mainship 30 Pilot II since 2015. GB-42 1986-2015. Former Unlimited Tonnage Master
Join Date: Oct 2007
Posts: 3,309
Check your engine specs for a start. Then you verify is see if you have wires connected to the specified location. If so, you could disconnect them and start the engine to witness the effect at the tach. If no wiring is connected to the specified location, I would think you are stuck with wire-following from tach to engine.
__________________

__________________
Rich Gano
FROLIC (2005 MainShip 30 Pilot II)
Panama City area
rgano is offline   Reply With Quote
Old 05-28-2020, 08:17 PM   #3
Guru
 
High Wire's Avatar
 
City: Cape May, NJ and Englewood, FL
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 3,914
Do you have any electrical schematic drawings for your engines? They would show the source of the tach pulses.
__________________
Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May NJ
High Wire is offline   Reply With Quote
Old 05-28-2020, 08:44 PM   #4
Guru
 
City: Bayfield, WI
Vessel Name: Gopher Broke
Vessel Model: Silverton 410 Sport Bridge
Join Date: Sep 2013
Posts: 806
Thanks. All of the manuals and documentation is on the boat. I'll see it in a couple weeks I guess.

BD
BDofMSP is offline   Reply With Quote
Old 05-28-2020, 09:51 PM   #5
Guru
 
syjos's Avatar


 
City: Gig Harbor
Vessel Name: Sandpiper
Vessel Model: Bluewater 40 Pilothouse Trawler
Join Date: Nov 2012
Posts: 2,284
Look to see if a grey wire is hooked up to the alternator. That is the tach signal wire.
syjos is offline   Reply With Quote
Old 05-29-2020, 05:38 AM   #6
Guru
 
ranger42c's Avatar
 
City: Annapolis
Vessel Model: 58' Sedan Bridge
Join Date: Aug 2013
Posts: 5,512
Quote:
Originally Posted by BDofMSP View Post
As I've been learning about tach calibration, I've noticed that some operate with a mechanical take-off & variable ratio alternator pickup and others with a magnetic pickup.

Simple question I'm sure, but how do I know which mine is?

Thanks
BD

I think you said you've got Cummins 450Cs? If correct, yours is magnetic

-Chris
__________________
Chesapeake Bay, USA
ranger42c is offline   Reply With Quote
Old 05-29-2020, 06:57 AM   #7
Guru
 
City: Bayfield, WI
Vessel Name: Gopher Broke
Vessel Model: Silverton 410 Sport Bridge
Join Date: Sep 2013
Posts: 806
Quote:
Originally Posted by ranger42c View Post
I think you said you've got Cummins 450Cs? If correct, yours is magnetic

-Chris
I do. Thanks Chris. I'll do a little research into how that all works. Good learning opportunity for me.

BD
BDofMSP is offline   Reply With Quote
Old 05-29-2020, 07:05 AM   #8
Guru
 
City: Bayfield, WI
Vessel Name: Gopher Broke
Vessel Model: Silverton 410 Sport Bridge
Join Date: Sep 2013
Posts: 806
Well that was easy. Again sbmar.com comes through with good information and great pictures!

Thanks for all the tips.
BD
__________________

BDofMSP is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 02:50 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×