Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 03-08-2018, 19:15   #1
Registered User

Join Date: Dec 2012
Posts: 4
Engine replacement Nord Havn 46

We have a John Deere 6068 (TO6068D) by Lugger in a Nord Havn 46. We have to replace the engine. Does anyone know of a comparable engine to the John Deere? Any experience with replacing with another engine? Any advice would be helpful! Thanks
__________________

Laura Foster is offline   Reply With Quote
Old 03-08-2018, 19:22   #2
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 24,151
Engine replacement Nord Havn 46

Why not overhaul the JD?
From my understanding itís hard to get better than a JD.
I have no idea if it would fit, but I believe the Rolls Royce if you will is a Gardner.

You know that JD is a wet sleeve engine and can easily be returned to new status if you will, you donít bore them out, you replace the cylinders with new ones.
__________________

a64pilot is offline   Reply With Quote
Old 03-08-2018, 19:51   #3
Registered User

Join Date: Dec 2012
Posts: 4
Re: Engine replacement Nord Havn 46

We had a piston melt down after 10 hours from last overhaul. Undiagnosed faulty fuel injectors (also rebuilt) or timing. Not sure the cause. We are in Philippines and not easy shipping parts again for another overhaul. The block appears ok, but head is cracked. Shipping replacement parts will cost as much as some new engines, so trying to look at a comparable solution with availability in Philippines.
Laura Foster is offline   Reply With Quote
Old 03-08-2018, 19:59   #4
Marine Service Provider
 
bdbcat's Avatar

Join Date: Mar 2008
Posts: 5,557
Re: Engine replacement Nord Havn 46

Laura....

Consider a de-rated Cummins 6BT-5.9M

180 HP continuous. Bulletproof. I have a pair in a 35 ton power cat with now 12,000+ hours, never had their heads off. They just run and run...

@A64...
A Gardiner would never fit. I tried, but it is a beast....

Good Luck
Dave
bdbcat is offline   Reply With Quote
Old 03-08-2018, 20:21   #5
Registered User

Join Date: Dec 2012
Posts: 4
Re: Engine replacement Nord Havn 46

At the risk of appearing obtuse on this, could you please explain de-rated? Thanks very much.
Laura Foster is offline   Reply With Quote
Old 03-08-2018, 20:31   #6
Registered User
 
James S's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: We're technically refugees from our home in Yemen now living in Lebenon
Boat: 1978 CT48
Posts: 5,950
Images: 139
Re: Engine replacement Nord Havn 46

I replaced my ford mermaid with a JCB 85hp.. no idea about how much trouble it would be as far as required changes.. but I do believe JCB is used in the PI
__________________
James
S/V Arctic Lady
I love my boat, I can't afford not to!
James S is offline   Reply With Quote
Old 03-08-2018, 20:41   #7
Marine Service Provider
 
bdbcat's Avatar

Join Date: Mar 2008
Posts: 5,557
Re: Engine replacement Nord Havn 46

Laura...

De-rating, simply, is an adjustment to the fuel system to limit the maximum fuel flow rate to the engine, and thus the maximum horsepower produced.

Of course, one can do this manually, by not using full throttle. And most displacement trawler operators do this naturally. But many commercial operators prefer that the engine be physically de-rated to a maximum continuous rating, so that full available throttle for days-on-end will be safe and reliable.

The Cummins 6BT block can be found in 300+HP variants with aftercooling, etc. At those power ratings there is a specified duty cycle, i.e. no more that 30 minutes per 6 hours of operation at the extreme power, for example.

https://cumminsengines.com/ratings-and-definitions

Dave
bdbcat is offline   Reply With Quote
Old 03-08-2018, 21:49   #8
CF Adviser
 
Pelagic's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Boat: Van Helleman Schooner 65ft StarGazer
Posts: 8,301
Re: Engine replacement Nord Havn 46

Hi Laura, are you in Subic or further south?
Pelagic is offline   Reply With Quote
Old 03-08-2018, 23:55   #9
Registered User

Join Date: Dec 2012
Posts: 4
Re: Engine replacement Nord Havn 46

Danao, Zekes boatyard.
It's on Cebu.
Laura Foster is offline   Reply With Quote
Old 04-08-2018, 03:32   #10
CF Adviser
 
Pelagic's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Boat: Van Helleman Schooner 65ft StarGazer
Posts: 8,301
Re: Engine replacement Nord Havn 46

Mark Pragnaul from HYS in Subic, had brought into Subic a few engines from Singapore, so is worth contacting
Pelagic is offline   Reply With Quote
Old 04-08-2018, 05:47   #11
Registered User

Join Date: Oct 2009
Location: Out cruising/ St. Augustine
Boat: Bruckmann 50
Posts: 680
Re: Engine replacement Nord Havn 46

I believe you can also run the Nordhavn 46 with the smaller JD 4045 if you wanted to stay with JD and just canít find the larger engine.
jkleins is offline   Reply With Quote
Old 04-08-2018, 05:55   #12
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 24,151
Re: Engine replacement Nord Havn 46

De rating an engine pretty much assures a very long life, cause when it's being run wide open, it's not really wide open.
it's very common in aircraft, and may be where the term came from.

Cummins is a very good engine as well. and very prolific and as it's an automotive engine and literally millions have been made, parts will be available for a long time.

Then of course there is Yanmar, but I'd rather have a Deere first, then a Cummins, and lastly a Yanmar.

I have an aversion to Green engines and to not offend I'll leave it at that
a64pilot is offline   Reply With Quote
Old 04-08-2018, 18:23   #13
Junior Cruiser

Cruisers Forum Supporter

Join Date: Jan 2015
Posts: 17
Re: Engine replacement Nord Havn 46

Your yacht is old enough to not require a Tier III certified replacement engine. For price and reliability it hard to beat the IVECO based BETA 150. https://betamarine.co.uk/portfolio-item/beta-150/
Attached Thumbnails
Click image for larger version

Name:	beta_150a_17-450x450.jpg
Views:	67
Size:	35.8 KB
ID:	174911  
Zhyachts is offline   Reply With Quote
Old 04-08-2018, 18:52   #14
Registered User
 
Kenomac's Avatar

Join Date: Jan 2012
Posts: 10,340
Re: Engine replacement Nord Havn 46

Quote:
Originally Posted by bdbcat View Post
Laura...

De-rating, simply, is an adjustment to the fuel system to limit the maximum fuel flow rate to the engine, and thus the maximum horsepower produced.

Of course, one can do this manually, by not using full throttle. And most displacement trawler operators do this naturally. But many commercial operators prefer that the engine be physically de-rated to a maximum continuous rating, so that full available throttle for days-on-end will be safe and reliable.

The Cummins 6BT block can be found in 300+HP variants with aftercooling, etc. At those power ratings there is a specified duty cycle, i.e. no more that 30 minutes per 6 hours of operation at the extreme power, for example.

https://cumminsengines.com/ratings-and-definitions

Dave
I’m also very curious about how his practice works. Our Perkins-Sabre M225ti was de-rated to 185hp from a normal 225hp rating, which is still plenty. We can cruise along all day at only 1200rpm which gets us 7 knots, then 1400-1500 gets us up to hull speed. Is it done mostly for reliability? I’m just used to the high revving Yanmar on our 53 with it’s 3500 red line.
Kenomac is offline   Reply With Quote
Old 04-08-2018, 19:28   #15
Registered User

Join Date: Jun 2007
Location: SW Florida
Boat: FP Belize, 43' - Dot Dun
Posts: 3,834
Re: Engine replacement Nord Havn 46

Quote:
Originally Posted by Kenomac View Post
Iím also very curious about how his practice works. Our Perkins-Sabre M225ti was de-rated to 185hp from a normal 225hp rating, which is still plenty. We can cruise along all day at only 1200rpm which gets us 7 knots, then 1400-1500 gets us up to hull speed. Is it done mostly for reliability? Iím just used to the high revving Yanmar on our 53 with itís 3500 red line.
IMO, derating is done to allow the same engine to fill a broader set of requirements. If a new engine design was required for every application, cost would be significantly higher. e.g., the Yanmar 3TNE in my genset is available with various fuel options creating 12hp - 30hp, depending on application, or the Suzuki 20hp outboard on my dinghy...same engine for 9.9hp and 15hp, just alter the fuel system.
__________________

DotDun is offline   Reply With Quote
Reply

Tags
engine, men

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
OpenCpn current for Nord sea PtBoyur OpenCPN 30 26-03-2017 10:20
Hello from nord adriatic Marcora Meets & Greets 8 26-10-2016 12:01
Nord 80 sail boat Mohallin Our Community 0 21-10-2016 06:24
L'Etoile du Nord, Chesapeake, VA.... At Grand Cay harbor, Abacos Sailndive345 Cruising News & Events 7 05-11-2014 12:15
Gilleleje Havn, Denmark nigel1 Our Community 0 08-12-2013 09:26



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 00:52.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.