Reply
 
Thread Tools Display Modes
 
Old 03-03-2014, 05:29 PM   #1
Senior Member
 
HenryD's Avatar
 
City: Heading south for Ft. Myers
Country: USA
Vessel Name: Seven Tenths
Vessel Model: Mirage / Great Harbour 47
Join Date: Dec 2012
Posts: 353
New Tachometer for Yanmar 4JH3

Hello,
I am redesigning my helm station and need to replace the tachometers. The current tachs are over 3" and just too big. I can find 2 1/16" tachometers but they are designed for gasoline engines.
Any suggestions?
__________________
Advertisement

HenryD is offline   Reply With Quote
Old 03-03-2014, 05:52 PM   #2
Guru
 
N4712's Avatar
 
City: South FL
Country: U.S.A
Vessel Name: Oliver
Vessel Model: Nordhavn 47 Hull# 12
Join Date: Apr 2013
Posts: 3,613
Quote:
Originally Posted by HenryD View Post
Hello, I am redesigning my helm station and need to replace the tachometers. The current tachs are over 3" and just too big. I can find 2 1/16" tachometers but they are designed for gasoline engines. Any suggestions?
Go digital (Nmea2k).
__________________

__________________
Thanks, Oliver
M/V Oliver
Nordhavn 47 Hull #12
N4712 is offline   Reply With Quote
Old 03-03-2014, 06:04 PM   #3
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 9,995
Greetings,
Lauderdale Speedometer and Compass
__________________
RTF
RT Firefly is online now   Reply With Quote
Old 03-03-2014, 09:31 PM   #4
Senior Member
 
HenryD's Avatar
 
City: Heading south for Ft. Myers
Country: USA
Vessel Name: Seven Tenths
Vessel Model: Mirage / Great Harbour 47
Join Date: Dec 2012
Posts: 353
N4712
I have NMEA2000 that works very well. The analog tachometer's will be backup.
Thanks
HenryD is offline   Reply With Quote
Old 03-03-2014, 09:34 PM   #5
Guru
 
N4712's Avatar
 
City: South FL
Country: U.S.A
Vessel Name: Oliver
Vessel Model: Nordhavn 47 Hull# 12
Join Date: Apr 2013
Posts: 3,613
Quote:
Originally Posted by HenryD View Post
N4712 I have NMEA2000 that works very well. The analog tachometer's will be backup. Thanks
Ahh ok, then like RTF said try using Lauderdale speedometer and compass, they did a lot of the work on our heavy machinery.
__________________
Thanks, Oliver
M/V Oliver
Nordhavn 47 Hull #12
N4712 is offline   Reply With Quote
Old 03-03-2014, 10:17 PM   #6
Senior Member
 
HenryD's Avatar
 
City: Heading south for Ft. Myers
Country: USA
Vessel Name: Seven Tenths
Vessel Model: Mirage / Great Harbour 47
Join Date: Dec 2012
Posts: 353
Thanks - will first thing in the morning.
HenryD is offline   Reply With Quote
Old 03-04-2014, 07:20 AM   #7
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,518
Any tach in a twin engine boat should be driven with a mounted tach drive , not simply from the alternators.

The alt driven units are only an approximation of the actual RPM , as belt tension , pully condition all are variables.

Fine for a single , where you just wish to get back to a sweet spot with no effort.

Much Un-good with twins if you are attempting to match the RPM to get rid of noise and droning .
FF is offline   Reply With Quote
Old 03-04-2014, 08:21 AM   #8
Guru
 
LarryM's Avatar
 
City: League City, TX
Country: USA
Vessel Name: Pelago
Vessel Model: Wellcraft 3300 Coastal
Join Date: Aug 2011
Posts: 843
Quote:
Originally Posted by HenryD View Post
Hello,
I am redesigning my helm station and need to replace the tachometers. The current tachs are over 3" and just too big. I can find 2 1/16" tachometers but they are designed for gasoline engines.
Any suggestions?
I would check with Lauderdale as was mentioned by other posters. Here is some reference info for you on your JH:

The tachometer on Yanmar 4JH3 series diesels utilize a magnetic pickup sender (MPU) which converts the rotary motion of the engine to an electrical signal by counting the number of teeth on the ring gear.

The ring gear has 116 teeth and the output voltage of the MPU is 1.0V or higher at 500RPM measured across a 20kOhm load.

If you want to go with NMEA2000 instrument integration, life just got easy. Maretron manufactures a model EMS100 interface that plugs directly into the factory engine wiring harness on Yanmar GM, YM, JH, LP and LY series engines. Couldn't be simpler.

Good luck

LarryM
m/v Boomarang
__________________

LarryM is online now   Reply With Quote
Reply

Thread Tools
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





All times are GMT -5. The time now is 10:43 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012