Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 07-09-2016, 09:58   #1
Registered User

Join Date: Sep 2016
Posts: 4
Transmission slipping or something else?

I have a Yanmar 4JH2-TE Engine and a Kanzaki KM4A Transmission. In neutral I can rev the engine to high RPM's when I put it into gear and throttle forward it barely goes up to 600 RPM's. I have to go into neutral and then forward several times and then when it grabs it goes...fast! This is an intermittent problem. Anyone have any ideas what the problem could be?
__________________

__________________
Sandy Jean is offline   Reply With Quote
Old 07-09-2016, 10:05   #2
Registered User

Join Date: Jan 2015
Location: ME: In Alaska avoiding mozzies , Boats in PE RSA
Boat: Dix 38 pilothouse
Posts: 188
Re: Transmission slipping or something else?

Does it go into reverse? if so do you get full rpm in rev?


fwd clutch plate comes to mind, though it could be as simple as a shim.
__________________

__________________
lamadriver is offline   Reply With Quote
Old 07-09-2016, 11:39   #3
Registered User

Join Date: Sep 2016
Posts: 4
Re: Transmission slipping or something else?

Yes it goes into reverse but when the symptoms are present, it reacts the same in reverse as in forward...no or little RPM's while in gear yet full run up of RPM's while in neutral.
__________________
Sandy Jean is offline   Reply With Quote
Old 07-09-2016, 12:23   #4
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 15,481
Re: Transmission slipping or something else?

I have to think something is wrong not with the transmission but with the lever, no matter what happens to the transmission the engine ought to get fuel, now if its getting fuel but the transmission is holding it back, then the engine ought to sound labored and be blowing black smoke, is it?
__________________
a64pilot is offline   Reply With Quote
Old 07-09-2016, 13:08   #5
Registered User
 
TheOffice's Avatar

Join Date: Jun 2012
Location: Annapolis
Boat: Hylas 44
Posts: 480
Re: Transmission slipping or something else?

shift it at the engine. Many of the Kanzaki trannys have a lever with a round hole on a round shaft. Over time they loosen. Check the fluid too. When was it last changed?
__________________
TheOffice is offline   Reply With Quote
Old 07-09-2016, 15:36   #6
Registered User

Join Date: Sep 2016
Posts: 4
Re: Transmission slipping or something else?

Quote:
Originally Posted by TheOffice View Post
shift it at the engine. Many of the Kanzaki trannys have a lever with a round hole on a round shaft. Over time they loosen. Check the fluid too. When was it last changed?
Fluid(oil) new last oil change. Will try shifting at engine when back on board. Thank you
__________________
Sandy Jean is offline   Reply With Quote
Old 07-09-2016, 17:37   #7
Registered User

Join Date: Jan 2015
Location: ME: In Alaska avoiding mozzies , Boats in PE RSA
Boat: Dix 38 pilothouse
Posts: 188
Re: Transmission slipping or something else?

That was my next suggestion was goign to be disconnect the cables and shift at the engine.


LD
__________________
lamadriver is offline   Reply With Quote
Old 08-09-2016, 09:09   #8
Registered User
 
Cadence's Avatar

Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 5,581
Re: Transmission slipping or something else?

If I understand you? It sounds like the engine is loading down not a tranny problem. Fuel starvation would be my first thought.
__________________
Cadence is offline   Reply With Quote
Old 08-09-2016, 09:22   #9
Registered User

Join Date: Mar 2008
Location: Seal Cove, ME
Boat: Cheoy Lee Clipper 42 schooner
Posts: 38
Re: Transmission slipping or something else?

Single lever control? Shifters can wear out, mine did (Yanmar 4JH-2TE w/ KBW20 transmission). Different symptoms, but +1 on operating both transmission and throttle at the engine.
__________________
Roger Noble
S/V Alchemy, Cheoy Lee Clipper 42 Schooner
Seal Cove, Maine
rogern is offline   Reply With Quote
Old 08-09-2016, 09:46   #10
Registered User

Join Date: Dec 2015
Location: Nanaimo BC
Boat: modified Spray 56' oa
Posts: 335
Re: Transmission slipping or something else?

Assume you have a two lever.. Can you inspect the internals at the bridge? Maybe a clip is loose and cable interferes with throttle. Or cable actually bends (just before breaking) between clip on and lever arm. Isolating at the engine and trannie and manual run will eliminate deep mechanical problems maybe.
__________________
topmast is offline   Reply With Quote
Old 08-09-2016, 09:47   #11
Registered User

Join Date: Aug 2016
Location: Long Island, NY
Boat: Cal 33-2
Posts: 44
Re: Transmission slipping or something else?

A slipping transmission clutch would be high revs but low propeller RPM. I'm in the camp that's suggesting the shift lever mechanism is the problem. Since it seems to "fix" itself after shifting a few times, it doesn't sound like fuel starvation.
__________________
S/V First Tracks
1985 Cal 33-2
JimsCAL is offline   Reply With Quote
Old 08-09-2016, 14:22   #12
Registered User

Join Date: Sep 2008
Location: Washington State, North Cascades
Boat: Valiant 40
Posts: 39
Re: Transmission slipping or something else?

I would agree with others to try shifting and throttle at the engine. As JimsCal said above, slipping would cause high revs. So, it is NOT slipping most of the time, it is grabbing.

But, if it is not a linkage adjustment:
I just recently had a similar problem on our boat, and it turned out to be prop fowling, (turns out there has been a lot of that this year in Puget Sound). I could not get higher RPM, she would barely move, could not maneuver, engine blew black smoke. Diver scraped blades, (it had been out of the water only 8 months prior), and VOILA!
__________________
bongo is offline   Reply With Quote
Old 08-09-2016, 15:32   #13
Registered User

Join Date: Mar 2015
Posts: 2
Re: Transmission slipping or something else?

It could be an intermittent fuel supply. My son had this problem, usually when putting engine into reverse to come alongside berth! Eventually found to be caused by broken springs in the fuel pump.
__________________
peedee is offline   Reply With Quote
Old 20-06-2017, 13:22   #14
Registered User

Join Date: Sep 2016
Posts: 4
Re: Transmission slipping or something else?

Thanks for all the suggestions. Finally tracked down the problem and it was the boost compensator in the governor. Not all 4JH2-TE engines have them so it was a mystery to a lot of people. It needed a slight adjustment and all is well.
__________________

__________________
Sandy Jean is offline   Reply With Quote
Reply

Tags
transmission

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
Kanzaki KH18 Slipping Transmission and Oil Choice mitbeaver Propellers & Drive Systems 2 30-03-2011 18:23
Slipping Transmission Troubadour52993 Engines and Propulsion Systems 4 15-03-2011 07:08
Dolfinite, polysulphide or something else? GWB Construction, Maintenance & Refit 10 06-12-2008 05:48
Transmission slipping? 3GM30F upsidedown Engines and Propulsion Systems 8 29-07-2008 05:38


Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 03:44.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.