Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 16-03-2021, 14:37   #1
Registered User

Join Date: Oct 2013
Posts: 21
Yanmar 4JH57 - Alternator

Hi All

Can anyone point me in the direction of a specs PDF (or something similar) for the alternator on a Yanmar 4JH57 (new engine this year). I have trawled the web and can't find anything - and the Yanmar manual is not very helpful (just says 12v - 125A).

The Alternator is made by Valeo ad is model SG10S078.

Thanks all,

Tim
timohara is offline   Reply With Quote
Old 16-03-2021, 18:54   #2
Registered User
 
sailingabe41ds's Avatar

Join Date: Sep 2020
Location: Channel Islands, CA
Boat: Jeanneau 41 DS
Posts: 559
Re: Yanmar 4JH57 - Alternator

Hi..
The Valeo number is SG10S078 as you mentioned. If you google alternator 128990-77250 that is the Yanmar number alternator you might get your alternator and j-way enterprises has it listed. Wx7002 is another number for a different manufacturer.
Hopefully you will find what you are looking for with that info. I tried a few months ago to see if I could find a back up alternator at cheaper price and get more details and I was not too successful. Balmar has a smart ready retrofit for this alternator if you are looking for a smart regulator.

Abe
sailingabe41ds is offline   Reply With Quote
Old 16-03-2021, 19:02   #3
Moderator and Certifiable Refitter
 
Wotname's Avatar

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 20,383
Re: Yanmar 4JH57 - Alternator

I can't help directly but I am wondering which particular specs you are looking for?
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is offline   Reply With Quote
Old 17-03-2021, 08:19   #4
Registered User

Join Date: Oct 2013
Posts: 21
Re: Yanmar 4JH57 - Alternator

Quote:
Originally Posted by sailingabe41ds View Post
Hi..
The Valeo number is SG10S078 as you mentioned. If you google alternator 128990-77250 that is the Yanmar number alternator you might get your alternator and j-way enterprises has it listed. Wx7002 is another number for a different manufacturer.
Hopefully you will find what you are looking for with that info. I tried a few months ago to see if I could find a back up alternator at cheaper price and get more details and I was not too successful. Balmar has a smart ready retrofit for this alternator if you are looking for a smart regulator.

Abe
Many thanks Abe
timohara is offline   Reply With Quote
Old 17-03-2021, 08:23   #5
Registered User

Join Date: Oct 2013
Posts: 21
Re: Yanmar 4JH57 - Alternator

Quote:
Originally Posted by Wotname View Post
I can't help directly but I am wondering which particular specs you are looking for?
I am wondering if it is a new modern 'smart alternator' - as I am installing Lithium house batteries - so need to know what it's voltage output is / behaviour. Suspect it is a dump alternator - and will just pump 14.1 (ish) volts out all the time - but need to be sure.

Thanks !
timohara is offline   Reply With Quote
Old 17-03-2021, 08:28   #6
Senior Cruiser
 
GordMay's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,312
Images: 241
Re: Yanmar 4JH57 - Alternator

Yanmar External Regulation Conversion Kit for Valeo Alternator
https://shop.marinehowto.com/product...conversion-kit




__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 18-03-2021, 15:22   #7
Registered User
 
Ween's Avatar

Join Date: Jul 2020
Location: Bahamas now
Boat: Valiant 42
Posts: 95
Re: Yanmar 4JH57 - Alternator

I have the same engine. Replaced the valeo extra dumb alternator. To make it ready for lithium you need to add $180 just to make it "smart ready" then another $300 for something like a MC612 regulator. That's a lot of "lipstick on a pig". Very low quality alternator.

Might as well get a 150A 60 series Balmar or an XT 170 even better and actually get 125A of steady charging, which your Lithium will love.
Ween is offline   Reply With Quote
Old 18-03-2021, 22:37   #8
Registered User

Join Date: Oct 2013
Posts: 21
Re: Yanmar 4JH57 - Alternator

Quote:
Originally Posted by Ween View Post
I have the same engine. Replaced the valeo extra dumb alternator. To make it ready for lithium you need to add $180 just to make it "smart ready" then another $300 for something like a MC612 regulator. That's a lot of "lipstick on a pig". Very low quality alternator.

Might as well get a 150A 60 series Balmar or an XT 170 even better and actually get 125A of steady charging, which your Lithium will love.
Thanks. The Yanmar engine data sheet says the alternator is 125A max output - is that your understanding too ?
timohara is offline   Reply With Quote
Old 19-03-2021, 03:27   #9
Registered User
 
Ween's Avatar

Join Date: Jul 2020
Location: Bahamas now
Boat: Valiant 42
Posts: 95
Re: Yanmar 4JH57 - Alternator

Quote:
Originally Posted by timohara View Post
Thanks. The Yanmar engine data sheet says the alternator is 125A max output - is that your understanding too ?
spec is 125A - never saw more than a true 90A come out of it and that was cold, ran at around 75A (shunt data) for a while but because it is so dumb and the batteries so hungry it would overheat and often sit at <50A
Ween is offline   Reply With Quote
Old 03-09-2021, 05:11   #10
Registered User
 
tmcdonagh's Avatar

Join Date: Jan 2015
Location: East Greenwich, RI
Boat: Tayana 37
Posts: 71
Re: Yanmar 4JH57 - Alternator

I am in the process of switching over to LiFePO4 also. I am struggling with trying to understand how the valeo will fit into the picture on my 4JH57. Two possibilities, add a second high capacity alternator and keep the valeo to keep the FLA start battery topped off or replace the Valeo with externally regulated high capacity alternator and go with a LiFePO4 start battery. Thoughts?
tmcdonagh is offline   Reply With Quote
Old 16-07-2022, 01:50   #11
Registered User

Join Date: Apr 2022
Location: Melbourne Australia
Boat: Jeanneau, Sunfast 3200, 32-33 feet.
Posts: 70
Re: Yanmar 4JH57 - Alternator

My electrical guy says leave the start AGM battery, and connect DC-DC charger(s) downstream of the start battery.

It won't damage the start battery because it will be fully charged straight after starting the motor.

A DC-DC charger with a heat sensor on the alternator, can also cut down its demands and hence preserve the alternator.

Then again, a decent alternator makes long term sense ...
Melbourne Park is offline   Reply With Quote
Old 03-08-2022, 12:48   #12
Registered User

Join Date: Feb 2019
Posts: 14
Re: Yanmar 4JH57 - Alternator

Quote:
Originally Posted by Ween View Post
That's a lot of "lipstick on a pig". Very low quality alternator.

Might as well get a 150A 60 series Balmar or an XT 170 even better and actually get 125A of steady charging, which your Lithium will love.
Did this mod to my Valeo, charging the factory Exides. Lasted about 18 months! Full Balmar now.

Have to agree with Ween about Lipstick and Pigs
calm waters is offline   Reply With Quote
Old 23-02-2024, 06:25   #13
Registered User

Join Date: Feb 2024
Posts: 3
Re: Yanmar 4JH57 - Alternator

I have the same engine, 4JH57, but I want to change this alternator and buy a new Balmar XT.







But I don't know how the type is the same.



I have 3 types to decide.
Mounting (1-2" shaft; 3.15" saddle; 4" saddle; or Vortec mount)

One foot or double foot
Pulley type (1/2" double V; J10 serpentine; or k6 serpentine)



Can someone help me please?
Jaragua is offline   Reply With Quote
Old 23-02-2024, 06:45   #14
Registered User
 
Ween's Avatar

Join Date: Jul 2020
Location: Bahamas now
Boat: Valiant 42
Posts: 95
Re: Yanmar 4JH57 - Alternator

Quote:
Originally Posted by Jaragua View Post
I have the same engine, 4JH57, but I want to change this alternator and buy a new Balmar XT.

But I don't know how the type is the same.

I have 3 types to decide.
Mounting (1-2" shaft; 3.15" saddle; 4" saddle; or Vortec mount)

One foot or double foot
Pulley type (1/2" double V; J10 serpentine; or k6 serpentine)

Can someone help me please?
XT-DF-170 or XT-CR-250 both fit

yanmar uses 3.15" dual foot

special 61-0050 K6 pulley for that engine's offset

get the kit
Ween is offline   Reply With Quote
Old 24-02-2024, 10:17   #15
Registered User

Join Date: Feb 2024
Posts: 3
Re: Yanmar 4JH57 - Alternator

Quote:
Originally Posted by Ween View Post
XT-DF-170 or XT-CR-250 both fit

yanmar uses 3.15" dual foot

special 61-0050 K6 pulley for that engine's offset

get the kit

Tanks
Jaragua is offline   Reply With Quote
Reply

Tags
alternator, yanmar

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Yanmar 4JH57 HKTim Engines and Propulsion Systems 14 18-06-2022 12:13
Yanmar 4JH57 to B&G Connection? SteveInMD Engines and Propulsion Systems 5 31-08-2020 14:11
Volvo D2-60 or Yanmar 4JH57 kmacdonald Engines and Propulsion Systems 1 15-12-2016 07:46
yanmar 4jh57 stoping truent II Engines and Propulsion Systems 4 24-10-2016 19:06
Yanmar 4JH57 Break In SteveInMD Engines and Propulsion Systems 1 10-04-2016 21:31

Advertise Here


All times are GMT -7. The time now is 17:23.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.