3JH2E Cruising RPM - SailNet Community

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  #1  
Old 10-26-2013
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3JH2E Cruising RPM

Hi All,

I know what Yanmar says about the max and cruising RPM's for this engine, but I wonder what people do in the real world and what their experience has been with the longevity and health of their engines as a result. We don't run ours much, but when we do we typically run it under 2500 rpm. What do you do?

Dave Mancini
PSC34 #305 Swan
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Old 10-26-2013
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Re: 3JH2E Cruising RPM

I normally cruise at about 5 and 1/2 knots, which equates to 2100 RPM with a 3 bladed max prop. The pitch is set so I can get 3250 RPM wide open for about 7 knots. There has been discussion on some sites about how good it is to run diesels hard or bad to idle them. Industrial diesels which run hard or idle a lot seem to have very long lives. I think the biggest engine killer for boats is overheating caused by cooling failure( impellers, sea weed, etc) cleanliness of fuel is the other biggy. Each time I motor I run the engine WFO for a few minutes and idle for a few before I shut it down. It only has 1650 hours but runs great. I don' t see any reason they shouldn't run 5000 hours.
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Old 10-27-2013
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Re: 3JH2E Cruising RPM

We have the older Yanmar engine, a 3HM35F, and run it a lot. We have engine drive refrigeration and to keep the freezer frozen we run the engine one to one and a half hours a day 150+ days per year. For the last six years we have traveled to the Bahamas and back motoring 1000+ miles down in the ICW and many back.

In 2004 we bought the boat, a 1988 model, with 4000 hr on the engine. In 2010 on our way south at 5800 hr the oil consumption jumped from 1 qt per 50-100 hr to 1 qt per 5 to 7 hr. That fall we pulled the engine, and I took it to Mac Boring in Union, NJ for a complete overhaul. The mechanic who did the work said the engine was fine except that the rings in the aft most cylinder were corroded into the piston. He suspected that at some point in the engine's life salt water had entered that cylinder. (When we bought the boat it had significant repaired damage to the port quarter of the hull and some interior water damage.)

We motor at around 2200 rpm with a two blade prop. We charge the batteries and freeze the holding plate starting at 1800 rpm (to keep the alternator fan spinning and the alternator cool) dropping to idle as the charge rate falls off.

Other issues uncovered during the overhaul that had no bearing on the oil comsumption included all three chamber liners were cracked and the heat exchanger was badly fouled with lime.

Bill Murdoch
1988 PSC 34
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Last edited by wsmurdoch; 10-27-2013 at 06:47 PM. Reason: I added the propeller size.
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Old 10-27-2013
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Re: 3JH2E Cruising RPM

Dave,
We have a max-prop on Indigo and run 1800-2000 rpm which gives us 5 1/2 knots and burns just over .5 gal per hour. I would guess we're probably slightly over pitched on the prop but the engine seems to run perfect - no smoke, chugging, etc. We did an 8 hour motor back from Annapolis a while back at 2200-2300 and got over 6 knots but it drastically increased our fuel burn. Since then, we run in that 1800-2200 range.
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Re: 3JH2E Cruising RPM

We don't have the 3JH2E, we have the 4JHT2e and we're also very guilty of not always running at the 60+% max rpm level. We bought our boat with 455 hours and now have 4318 hours. We are even worse...we have a turbo and most mechanics say always run with turbo engaged, 2400-2600 rpm's. We power at 6 knots in calm seas at 1800-2000 rpms and enjoy the fuel efficiency and quiet. We rarely run the engine for power.

So far no extra oil consumption or any other signs of the engine being unhappy. We did bring along a spare turbo for this trip in case our fuel effficiency strategy comes back to bite us.

My wife says it is like flossing. Everyone is suppossed to do it and few people do because the potential downside isn't seen for years down the road and sometimes never.

Roger Block
Shango
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Re: 3JH2E Cruising RPM

Thanks to all for the input. I enjoyed reading your experiences. This really helps me with the guilt I've been feeling about not running at 80% of max. It also gives me hope for the life of our engine. We only have about 730 hours on it now. I might even start flossing less.

Dave
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Old 10-29-2013
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Re: 3JH2E Cruising RPM

I see all the 3JH2E's mentioned are in PSC 34's (26' 3" LWL). Does anyone have that engine in a 31 or 32PH (I have the latter with a Scheel keel) - which have a 24' 3" LWL?

My approximate readings with a 16" Max-Prop are:
5.4 knots @ 3000 rpm
5 knots @2800 rpm
4.5 knots @ 2750 rpm
This seems like rather more effort required than with a 34' ...
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Old 11-01-2013
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Re: 3JH2E Cruising RPM

Sounds like your pitch may be way too low. Your engine should approach 3300 rpm at about 7 knots. I would think you could get 5 kt at 2000-2100 rpm. I can nearly get your speeds in a 34 dragging a lobster trap. Have the maxi prop checked out, when first installed mine was way too much pitch.
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Re: 3JH2E Cruising RPM

One more thing, is your speed measured by the little water turbine under the hull or are we talking gps speed over the ground(no wind, No current). My knot log with the tiniest bit of crud is always reading 1 kt or more too slow, it cruds up so fast that I didn't even install it this season.
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Old 11-02-2013
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Re: 3JH2E Cruising RPM

Thanks... I will try to check prop pitch. I have found the Max-Prop instruction book for the boat, indicating this prop (16") was set at 6.4" pitch/12 degree blade angle.
(The paddle wheel and the gps speeds do accord).
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