yanmar 3Ym30 engine replacement
Printed From: myHanse.com
Category: Hints & Tips
Forum Name: 370 / 375
Forum Description: 370 / 375 Hints, Tips and News
URL: https://www.myhanse.com/forum_posts.asp?TID=12343
Printed Date: 27 March 2026 at 03:41
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Topic: yanmar 3Ym30 engine replacement
Posted By: tango
Subject: yanmar 3Ym30 engine replacement
Date Posted: 14 November 2020 at 16:44
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hello to everyone i have a 2010 hanse 375 that gives me satisfaction for everything except for the 30hp engine that i find not powerful enough. I would like to change it for a 40hp engine is what someone has already done this transformation. and if so is it worth it? thank you for your answers josé |
Replies:
Posted By: Captain Cook
Date Posted: 14 November 2020 at 17:35
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The 40 HP 3JH4E engine was an add-on to the old 370, for a price. BUT do NOT buy the SD50 saildrive, there are a few hundred posts on this site about the slipping cone clutch. If you want a 40HP engine, you may research, if your old SD20 saildrive (with dog clutch) fits the larger engine. Otherwise the newer SD60 saildrive may be an option. :Kjeld ------------- Freya H400 #27 (2006),2-cabin, 40HP 3JH4E, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M603(VHF)+M802(SSB) |
Posted By: Peter-Blake
Date Posted: 14 November 2020 at 18:24
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I own a Hanse 370 also with a 30hp 3ym30. For me this motor is absolut enough. Maybe you check your Propellor, before you change the motor. I have a 3 Blade flexofold. Nearly always enough power, except in strong headwinds combined with steap short waves, But than i usually sail. I own a sailboat not a motorboat. ------------- Blake 370 
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Posted By: S&J
Date Posted: 14 November 2020 at 20:12
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I would also expect the 30hp engine to be more than sufficient. The Volvo D1-30 coupled with the Volvo saildrive and a Gori 2 blade folding prop was easily powerful enough for my 385 with 6.0kts at 2,000 revs and 7.2kts at 2,500 revs on flat water. In fact the values sent to Volvo after my commissioning sail were 8% higher than this however I subsequently calibrated the boat speed log as I felt it was over-reading. ------------- H458 #159 Primal Mediterranean cruising |
Posted By: tango
Date Posted: 15 November 2020 at 16:27
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thank you for the answers I'm in the mediterranean now, I'm sailing as much as I can thanks to the gennaker and the asymmetric spinnaker. but in summer the wind is too weak sometimes and in order to advance to 6 knots I have to put the engine at 2800 rpm, so it consumes too much diesel. There is also the mistral with gusts of 40 knots and the power is insufficient. Maybe it's a propeller problem, I have a two-bladed folding propeller 17x13 but I manage to mount the engine at maximum 3600 rpm. what do you have on your 370 ET 375 with a 30HP motor? Translated with http://www.DeepL.com/Translator" rel="nofollow - www.DeepL.com/Translator (free version) |
Posted By: S&J
Date Posted: 15 November 2020 at 16:40
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For reference my max speed/revs were 7.8kts at 2,900 revs. If you can push the engine to 3,600 this might suggest propeller issues? ------------- H458 #159 Primal Mediterranean cruising |
Posted By: Captain Cook
Date Posted: 15 November 2020 at 17:31
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This is the relationship between RPM, speed, and consumption on the 40HP 3JH4E on my H400. The steep rise in consumption is typical for all engines, also yours.
------------- Freya H400 #27 (2006),2-cabin, 40HP 3JH4E, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M603(VHF)+M802(SSB) |
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Posted By: tango
Date Posted: 15 November 2020 at 17:39
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max. rpm for the Yanmar3YM30 3600 rpm volvo D1 30 3200 rpm so I think it's normal that I can mount the engine at 3600rpm. in cruise I sail at 2500 rpm for a speed of 5,5 knots what is the size of your propellers thanks for this table we can see that the consumption of diesel is exponential.
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Posted By: Sea-U
Date Posted: 16 November 2020 at 13:32
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I too have a Yanmar3YM30 which reaches 3600 rpm all too easy. As I understand Yanmar has specified a too small propeller because they were afraid that the saildrive could not cope a bigger propeller. I have thought of change to a bigger propeller but not sure if the saildrive would wear off too early. Not sure if that really is an issue. I think I would have gone for a 2 blade as it is cheaper and more efficient. ;-) -------------  Sea-U is a 370e #532 located SW Norway
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Posted By: tango
Date Posted: 16 November 2020 at 16:02
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I agree with you Sea U the size of my two-blade folding propeller is 17 x13 and yours? Thank you |
Posted By: Sea-U
Date Posted: 16 November 2020 at 18:12
I have yet to remember to get the size of the propeller when on shore. 
It was delivered by Hanse. ------------- Sea-U is a 370e #532 located SW Norway
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Posted By: Captain Cook
Date Posted: 16 November 2020 at 20:33
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Search->advanced search->"size flexofold"->all forums->any date-> -> and you will find 6 pages with informations about propellers. https://www.myhanse.com/search_results_posts.asp?SearchID=20201116201838&KW=size+flexofold&PN=1" rel="nofollow - https://www.myhanse.com/search_results_posts.asp?SearchID=20201116201838&KW=size+flexofold&PN=1 Change the search words, and you may find more. ------------- Freya H400 #27 (2006),2-cabin, 40HP 3JH4E, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M603(VHF)+M802(SSB) |
Posted By: H8jer
Date Posted: 21 November 2020 at 17:17
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I also have the 30hp yanmar sd20. It is not under powered. Flat out the boat goes 7.3kn with a tiny (too tiny?) Flexofold Racing 16x13 2Blade SD20 is max 16" in diameter but hear 17" is ok.
------------- Hanse 370#487 30HP 3-cabin |
Posted By: jeb
Date Posted: 21 November 2020 at 17:57
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I use to have a Hanse 371 with the Yanmar 3ym30 and sd20. It was fitted with a flexOfold 16x10 3L, revved much to much. When order the boat I did som research and got a prop calculation from flexOfold and they suggested 17x12 or 17x13 3L and I also asked Hanse for that. But when taking delivery (back in 2004) the boat was already in the water so I could not check. after first summer I got it replaced with a 17x11 3L. Better but still revving a little bit to much. Before replacing your 30hp, buy a decent prop.
------------- Jesper Hanse 400e |
Posted By: tango
Date Posted: 21 November 2020 at 18:02
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Thank you for the answer the 370 is lighter than the 375 (800KG) can you tell me if you have a 3 or 2 blade propeller and at what rpm do you reach the speed of 7.3 |
Posted By: H8jer
Date Posted: 21 November 2020 at 18:15
Have not measuered the tachometer but looks like 3600. To blades. Next season I can try to measure. Normal crusing is 2100-2450 around 6 kn ------------- Hanse 370#487 30HP 3-cabin |
tango wrote: