Reply
 
Thread Tools Display Modes
 
Old 06-29-2016, 12:06 PM   #1
Senior Member
 
David Rive's Avatar
 
City: Markham
Country: Canada
Vessel Name: Loons Nest
Vessel Model: 2003 American Tug 34
Join Date: Apr 2015
Posts: 233
Yanmar Lifespan?

I am contemplating a power cat that has twin Yanmar 4JHE-TE engines ... 75 hp and turbo. They currently have about 4400 hours each, but have been meticulously maintained by the owner, who is ex-navy and quite obsessive. What is a reasonable life expectancy of these engines? Any thoughts, comments, and experiences would be appreciated.

David
__________________
Advertisement

David Rive is offline   Reply With Quote
Old 06-29-2016, 12:27 PM   #2
Guru
 
Join Date: Jun 2014
Posts: 1,275
I can't speak to that particular engine but I have seen the non turbo version with 9000 hours that ran well. Of course so much depends on maintenance, use, propeller pitch, etc. It might be interesting to see an oil analysis history exists...
Bruce
__________________

Bruce B is offline   Reply With Quote
Old 06-29-2016, 12:31 PM   #3
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 3,888
Find out if coolant has been replaced on schedule, what coolant was used, and last time the heat exchangers have been cleaned.

If truly well maintained, 4400hrs does not freak me out.

How's the access to the engines all around? Some cat's are nightmares, some are pretty good.
Ski in NC is online now   Reply With Quote
Old 06-29-2016, 01:49 PM   #4
Guru
 
BandB's Avatar
 
City: Fort Lauderdale
Country: USA
Join Date: Jan 2014
Posts: 13,161
Still subject to them being surveyed. Ex Navy obsessive means nothing until the condition of the engines reflect it. I knew an ex navy submarine mechanic who didn't believe in ever changing the oil in his car.

Just saying not to let the apparent history make you skip an important step.
BandB is offline   Reply With Quote
Old 06-29-2016, 01:58 PM   #5
Senior Member
 
City: Owings, Md
Country: US
Join Date: Jan 2016
Posts: 224
Quote:
Originally Posted by BandB View Post
Still subject to them being surveyed. Ex Navy obsessive means nothing until the condition of the engines reflect it. I knew an ex navy submarine mechanic who didn't believe in ever changing the oil in his car.

Just saying not to let the apparent history make you skip an important step.
You can get away with that on a Detroit, just change the filters and keep it topped off, it will drain the old stuff on it's own.
Gdavid is offline   Reply With Quote
Old 06-29-2016, 02:34 PM   #6
Guru
 
BandB's Avatar
 
City: Fort Lauderdale
Country: USA
Join Date: Jan 2014
Posts: 13,161
Quote:
Originally Posted by Gdavid View Post
You can get away with that on a Detroit, just change the filters and keep it topped off, it will drain the old stuff on it's own.
I'm just saying that many times Navy or whatever, the story is how well things have been maintained and the current condition doesn't support that story. Sometimes I've seen it be a lot of maintenance by someone who didn't know what they were doing. Some of the worst messes I've heard of have been due to improvements and changes made by very diligent owners.
BandB is offline   Reply With Quote
Old 06-29-2016, 02:56 PM   #7
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Country: USA
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 13,714
The JH 55hp has a bullet proof rep but I don't know if it extends to the turbo or turbos. I think there are several versions of turbos on that engine and one may be almost like no turbo at all. But I don't think turbos are the least bit bad as long as the boat is propped correctly.

We had a 3cyl Yanmar and it was great. Except a slight corrosion issue that led to the purchase of my specific engine on my present boat .... Whereas there is no aluminum on that engine. With the exception of the valve cover.

But re the OP there's no bad new engine .... only engines that haven't been maintained or operated responsibly. But Yanmar engines are fine in my book.
__________________
Eric

North Western Washington State USA
Nomad Willy is offline   Reply With Quote
Old 06-29-2016, 03:12 PM   #8
Guru
 
djmarchand's Avatar
 
City: East Greenwich, RI
Country: USA
Vessel Name: Bella
Vessel Model: Mainship Pilot 34
Join Date: Aug 2012
Posts: 2,881
My neighbor had one on his sailboat and I helped him with an overheating problem, so I am somewhat familiar with it. The 4JH is a 2 liter engine and at 75 hp you aren't stressing it badly. OTOH I am sure that it doesn't have the tricks of its higher powered cousins like piston lube oil spray, etc.


Like Ski I am not freaked out by those hours if it was maintained well and run right. Check the phototached wot rpm. That says a lot about an owners attention to the engine.


And I agree that ex-Navy means little. I have seen kids run small assault water craft one of two ways: full out or stopped. The Navy has its 1,000 endurance test where the engine is mostly run flat out for a reason.


David
djmarchand is online now   Reply With Quote
Old 06-29-2016, 04:00 PM   #9
Guru
 
BandB's Avatar
 
City: Fort Lauderdale
Country: USA
Join Date: Jan 2014
Posts: 13,161
Quote:
Originally Posted by djmarchand View Post

And I agree that ex-Navy means little. I have seen kids run small assault water craft one of two ways: full out or stopped. The Navy has its 1,000 endurance test where the engine is mostly run flat out for a reason.


David
You have auto mechanics who completely ignore maintenance on their own car. I knew one who had to short wire it every day to start it until his boss told him to step outside and fix it now, that it was embarrassing for customers to see one of his mechanics doing that.
BandB is offline   Reply With Quote
Old 06-30-2016, 06:31 AM   #10
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,530
"The Navy has its 1,000 endurance test where the engine is mostly run flat out for a reason."

The Navy usually specks heavy duty or industrial engines so can perform this sort of test.

For auto or lawn implement sourced engines , a different duty cycle is expected.
FF is offline   Reply With Quote
Old 06-30-2016, 09:46 PM   #11
Senior Member
 
She-Kon's Avatar
 
City: Iroquois, ON
Country: Canada
Vessel Name: She:Kon
Vessel Model: Bateau TW28
Join Date: Jun 2014
Posts: 463
I just dropped off my 4JH-TE (55 HP Turbo) at a local dealer for servicing before it goes in the boat we're building. It has 675 hrs on the clock (came out of a racing yacht). The head mechanic told me they have the same engine in their work barge and it's got 15,000 hrs on it, never rebuilt but properly maintained.
__________________
Yours Aye! Rick
~^~^~^^~^~^~^~^~^~^~^~~^~^~~^~^~^^~~^~^
"It's not the boat "you built" until you've sworn at it, bled on it, sweated over it, cried beside it and then threatened to haul the POS outside and burn it!"
She-Kon is offline   Reply With Quote
Old 07-01-2016, 01:15 PM   #12
Guru
 
City: Fort Myers
Country: USA
Join Date: Jul 2013
Posts: 956
The upside is it made 4400 hours, would not have gotten that far if not properly maintained. Good engine survey with oil analysis should tell you the full picture.
__________________

Marlinmike is offline   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 04:55 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