Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 08-04-2013, 17:08   #16
Registered User
TacomaSailor's Avatar

Join Date: Nov 2012
Location: Burnt Store Marina, SW Florida
Boat: Caliber 40
Posts: 1,149
Re: Yanmar Engine Life Expectancy?

When we bought our new boat with a new Yanmar 4JH2E I hired a mechanic from the local Yanmar dealer who dealt primarily with commercial fishing boats.

He told me that the commercial Yanmars would easily run 10,000 hours because the commercial owners put them at 70% - 80% power and ran them like that for days at a time (it is a LONG way from Tacoma WA to SE Alaska). They kept them hot and revving.

He said they had serviced lots of glazed and failed Yanmars in sailboats - all failed because, as dozens others have said, Yanmar is a high RPM engine. He said it is mandatory to run at 3000 RPM (the 4JH2E) for five minutes every 5 hours or more often. He also said it is critical to run the engine at 3000 RPM for 10 seconds after docking - then let is slow to idle for a couple seconds and shut it off.

And... if you start the engine - get it all the way up to FULL operating temperatures before shutting it down. Not reaching full temp (190 F) will not "cook" the acids and water out of the oil and will lead to early internal corrosion.

He told us to set our Maxprop so we could comfortably run the engine at 2600 - 2750 RPM forever. Our Max RPM is 3200 for an hour and 3400 for five minutes (I think) and he wanted the engine to consistently run in the 70% (~2400) to 85% (2850) range under normal cruising.

And - he said the worst thing a Yanmar owner can do is charge a 12V battery bank with a 135 amp alternator - it puts less than 3 HP load on the engine and will quickly glaze it - thus our huge solar array.

We've followed his advice and have 2850 great hours on the engine.

PS - while testing the injectors at the dock, in neutral, he had the engine running above 4000 RPM - don't know how far 'cause the tack stops at 4000. I picked up my feet to avoid the flying pistons and rods but he assured me no Yanmar has ever blown due to high RPM.

TacomaSailor is offline   Reply With Quote
Old 08-04-2013, 17:37   #17
CF Adviser
Bash's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
Re: Yanmar Engine Life Expectancy?

Every Yanmar mechanic I've ever used has given the same advice: run the engine at least 80% of WOT. I have the 75 hp turbo currently, and take it up to at least 2,800 RPM if I'm going to be running it more than ten minutes. And every few hours I'll run it at 3,200 RPM just to make it happy, although at that point I'm using fuel inefficiently because I'll be doing hull speed.

cruising is entirely about showing up--in boat shoes.
Bash is offline   Reply With Quote
Old 10-05-2015, 13:32   #18
Registered User

Join Date: Mar 2013
Posts: 25
Re: Yanmar Engine Life Expectancy?

Hi I would like to add just a bit about Diesel motors I have had as light plants in the oilfield, One motor Perkins Diesel I had ran 27000 hours before needing a rebuild.
And the water pump had given up at that time, We were doing oil sampling on this motor to see just how long it could go, The motor ran 24 hours a day with only shut downs to do oil changes, at 250 to 400 hours in between changes,
I am still on the hard and shopping But I would like to thing Sail boat motors have a lot more life in them then 2000 hours.

Harter is offline   Reply With Quote

engine, yanmar

Thread Tools
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
marine survey advice Ardi Monohull Sailboats 13 28-02-2013 17:07
Engine Cooling Solinoid on Yanmar 3H series engines anontrolus Engines and Propulsion Systems 3 20-11-2012 03:27
Engine Wouldn't Quit MikeTurner Engines and Propulsion Systems 5 14-01-2012 22:55
Yanmar 4JH3TE Fuel Filter Sensor - Engine Does Not Start VVD Engines and Propulsion Systems 0 20-08-2011 18:10
Want To Buy: Parts for a Yanmar 2QM15 Engine Carl-T705 Classifieds Archive 0 18-08-2011 21:57

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 14:54.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.