Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 24-03-2010, 16:50   #1
Registered User

Join Date: Mar 2010
Posts: 15
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
__________________

jarod is offline   Reply With Quote
Old 24-03-2010, 16:57   #2
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 6,298
what kind of prop do you have?
__________________

Sailmonkey is online now   Reply With Quote
Old 24-03-2010, 17:16   #3
Registered User

Join Date: Mar 2010
Posts: 15
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
jarod is offline   Reply With Quote
Old 24-03-2010, 18:34   #4
Eternal Member
 
Chief Engineer's Avatar

Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
What is your idle RPM
Chief Engineer is offline   Reply With Quote
Old 24-03-2010, 21:27   #5
Registered User

Join Date: Mar 2010
Posts: 15
The idle was set at 700 rpm...this is as low as it will go and still run reasonably at idle.
jarod is offline   Reply With Quote
Old 25-03-2010, 08:03   #6
Do… or do not
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 9,228
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.
s/v Jedi is offline   Reply With Quote
Old 25-03-2010, 08:08   #7
Registered User

Join Date: Nov 2005
Location: Ohio
Posts: 2,320
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.
Joli is offline   Reply With Quote
Old 25-03-2010, 09:45   #8
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 6,132
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.
__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 25-03-2010, 10:20   #9
Registered User

Join Date: Mar 2010
Posts: 15
Good to hear it is normal. I replaced the mounts as well so it wouldn't be related to them.
jarod is offline   Reply With Quote
Old 25-03-2010, 10:20   #10
Registered User
 
Inthewind's Avatar

Join Date: Mar 2007
Location: Charlotte harbor, FL
Boat: Morgan OI 414
Posts: 251
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.
Inthewind is offline   Reply With Quote
Old 25-03-2010, 15:02   #11
Registered User

Join Date: Jun 2005
Posts: 1,901
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.
never monday is offline   Reply With Quote
Old 25-03-2010, 15:18   #12
Registered User

Join Date: Mar 2010
Posts: 15
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.
jarod is offline   Reply With Quote
Old 26-05-2018, 05:14   #13
Registered User

Join Date: Oct 2012
Location: Sitka, AK
Boat: Catalina/Morgan 50
Posts: 6
Re: Yanmar Really Clunks when Going into Gear

Quote:
Originally Posted by Inthewind View Post
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.
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!
capt.blain is offline   Reply With Quote
Old 26-05-2018, 07:03   #14
Registered User
 
Greg4cocokai's Avatar

Join Date: Jun 2011
Location: Long Beach, Ca. USA
Boat: Norseman 447
Posts: 341
Re: Yanmar Really Clunks when Going into Gear

Capt. blain, do you realize this thread is 8 years old?
__________________

__________________
GREG, s/v Sirena
currently, Long Beach, Ca.
Greg4cocokai is online now   Reply With Quote
Reply

Tags
yanmar

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Yanmar SD 20 Saildrive- In Gear While Sailing ? Ram Propellers & Drive Systems 8 21-07-2014 03:46
Snorkeling Gear sfreivald Fishing, Recreation & Fun 69 22-09-2010 05:44
Discolored Gear Songline Engines and Propulsion Systems 19 19-12-2008 11:17
Reduction Gear oil seal replacement Yanmar 3gm30F upsidedown Engines and Propulsion Systems 4 23-07-2008 21:04



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 18:00.


Google+
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.