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24-03-2010, 16:50
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#1
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Registered User
Join Date: Mar 2010
Posts: 15
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Yanmar Really Clunks when Going into Gear
I just installed a brand new YANMAR 4JH4AE 54HP diesel in my boat. The engine is mated to a KANZAKI marine gear. I believe it is a KM35A2 and is a cone clutch setup. I am trying to figure out if the clunk i hear is normal for this engine or do i have a defective transmission? The yanmar mechanic stated that it was normal when he heard it, but i expected it to be a bit more refined considering it is a modern Japanese built motor. It runs great when in gear and goes into reverse quite smoothly. I would love someone to alleviate my fears and tell me this is normal. Can someone with this model or a similar yanmar please weigh in with your experiences before I call the dealer and start ranting like a lunatic.
Thanks
Jarod
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24-03-2010, 16:57
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#2
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Registered User
Join Date: Sep 2009
Location: Houston
Boat: ‘01 Catana 401
Posts: 9,626
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what kind of prop do you have?
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24-03-2010, 17:16
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#3
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Registered User
Join Date: Mar 2010
Posts: 15
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I have a 3 blade fixed prop. The pitch is not dead on but engine will come within 100rpm of max rated. I did go with a bit heavier shaft than is suggested for that engine, but i wouldn't think that would make a big difference. I went with a 1.5 inch shaft instead of the standard 1.25 inch shaft. This was necessary due to the wide bearing spacing....i would have suffered shaft whip with the thinner shaft. I called a different Yanmar dealer and he said they get better over time and it is nothing to worry about...which is what the dealer i bought the engine from is telling me. I just really want to hear from someone other than a dealer that they have experienced the same thing and it either got better or was a non-issue.
Thanks
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24-03-2010, 18:34
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#4
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Eternal Member
Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
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What is your idle RPM
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24-03-2010, 21:27
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#5
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Registered User
Join Date: Mar 2010
Posts: 15
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The idle was set at 700 rpm...this is as low as it will go and still run reasonably at idle.
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25-03-2010, 08:03
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#6
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always in motion is the future
Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 18,866
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I have a big clunk too but the maxprop is adding to it. It sounds different going to reverse.
I hope it's normal ;-)
cheers,
Nick.
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25-03-2010, 08:08
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#7
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Registered User
Join Date: Nov 2005
Location: Ohio
Posts: 2,933
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Every boat I've been on with a Yanmar engine and tranny has a noticable KLUNK. I think unless you go to a hydraulic tranny you're kind of stuck with it but they seem quite durable.
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25-03-2010, 09:45
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#8
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Registered User
Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 7,145
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New motor mounts too???
I had a 3HM35F on a 1 1/2 year old boat which always had one clunk when the engine was stopped. I thought it was normal. Years later, I checked the motor mounts when doing an engine alignment check. Sure enough, one had a broken stud. The clunk was the engine jumping off the broken stud and landing on it again. That was the only time I heard the clunk.
After replacing the mount, it was gone.
__________________
The question is not, "Who will let me?"
The question is,"Who is going to stop me?"
Ayn Rand
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25-03-2010, 10:20
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#9
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Registered User
Join Date: Mar 2010
Posts: 15
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Good to hear it is normal. I replaced the mounts as well so it wouldn't be related to them.
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25-03-2010, 10:20
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#10
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Registered User
Join Date: Mar 2007
Location: Charlotte harbor, FL
Boat: Morgan OI 414
Posts: 251
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Yes the KANZAKI is cone engagement and the clunk sound when putting in gear is normal for these transmissions. I have been working with KANZAKI's for years and they all do it.
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25-03-2010, 15:02
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#11
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Registered User
Join Date: Jun 2005
Posts: 1,901
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are you sure the forward you are selecting is the forward for the box? Reverse has an idler gear. If you have the wrong handed prop, you could be going forward in rev.
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25-03-2010, 15:18
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#12
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Registered User
Join Date: Mar 2010
Posts: 15
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The prop rotates clockwise and the transmission is specified as a right hand drive. I don't think that is the issue. Good thought though i never even considered that as an option.
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26-05-2018, 05:14
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#13
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Registered User
Join Date: Oct 2012
Location: Sitka, AK
Boat: Catalina/Morgan 50
Posts: 6
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Re: Yanmar Really Clunks when Going into Gear
Quote:
Originally Posted by Inthewind
Yes the KANZAKI is cone engagement and the clunk sound when putting in gear is normal for these transmissions. I have been working with KANZAKI's for years and they all do it.
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Inthewind I need your advice. New Yanmar 4Jh4-HTE with Kanzaki gear. Engine dies immediately on putting into fwd or reverse with a lurch/clunk. Prop & shaft straight and clear of lines. It runs fine in neutral. It runs fine when shaft is disconnected. When I hand turn the shaft there is a slight catch. Does it sound like cone gear, or could there be something like a secondary stopping device that stops the engine on putting a load on it? Any help greatly appreciated!
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26-05-2018, 07:03
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#14
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Registered User
Join Date: Jun 2011
Location: Long Beach, Ca. USA
Boat: Norseman 447
Posts: 403
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Re: Yanmar Really Clunks when Going into Gear
Capt. blain, do you realize this thread is 8 years old?
__________________
GREG, s/v Sirena
currently, Puerto Vallarta, Mexico cool:
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