Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 13-05-2024, 12:24   #1
Registered User

Join Date: May 2024
Location: Denmark
Boat: Nauticat 40
Posts: 2
Borg Warner gearbox problem

Hi fellow cruisers!
I have a problem with my Borg Warner 72C gearbox. It makes a big "klonk" sound when i put it in gear, almost every time. The shift arm has been correct adjusted, new gear oil, damper plate changed on the engine, but still it makes a heavy klonk sound. (some times it goes in gear smooth..) I am beginning to think it is the prop. I have an Autoprop (old) but ok. Maybe it is to big. Anybody have the same experience with that gearbox/autoprop?
Jacob Vetter is offline   Reply With Quote
Old 13-05-2024, 13:10   #2
Registered User
 
Foswick's Avatar

Join Date: Apr 2024
Location: San Juan Islands, US
Boat: Fuji 32
Posts: 141
Re: Borg Warner gearbox problem

Well, it is not resistance. Resistance is futile.
Foswick is offline   Reply With Quote
Old 14-05-2024, 01:44   #3
Moderator

Join Date: Feb 2010
Location: Australia
Posts: 3,423
Re: Borg Warner gearbox problem

Hi Jacob and welcome to the forum. Here’s a list of things I’d be checking to track down the “klonk”
1. Check idle speed, if idle is too high it may cause a harsh engagement
2. Input shaft splines worn. I know the damper plate is new but did you look closely at the shaft spline?
3. Output flange splines, if either of the splines ( male or female) on the gearbox output are worn, there will be a noise, maybe an oil leak too
4. Coupling to propshaft key worn out and coupling loose on shaft.
5. Propeller loose on shaft, again , worn key and loose on taper.
The last two on the list are the risky propositions, each of these circumstances can either lose the prop off the end of the shaft or lose the propshaft to gearbox connection and in some instances the rudder can be blocked by the shaft.
Is it a reduction gear BW or direct drive?
skipperpete is offline   Reply With Quote
Old 15-05-2024, 05:53   #4
Registered User

Join Date: May 2024
Location: Denmark
Boat: Nauticat 40
Posts: 2
Re: Borg Warner gearbox problem

Thanks!
You have a good point in output flange spline, they were worn when we changed the damper plate. I just now found out that the prop is also to big for the engine/gear/boat, so thats also a problem. I have a reduction gear, Borg Warner Velvet Drive 72C, gearing: 2.10:1
Jacob Vetter is offline   Reply With Quote
Old 15-05-2024, 06:30   #5
Registered User
 
deblen's Avatar

Join Date: Oct 2014
Location: Bay of Fundy,Grand Manan,N.B.,Canada N44.40 W66.50
Boat: Mascot 28 pilothouse motorsailer 28ft
Posts: 3,397
Images: 1
Re: Borg Warner gearbox problem

Some info on how to check Borg Warner fluid:
https://www.justanswer.com/boat/h2to...ive-fluid.html


Cheers/Len
__________________
My personal experience & humble opinions-feel free to ignore both
.
deblen is offline   Reply With Quote
Old 15-05-2024, 16:43   #6
Moderator

Join Date: Feb 2010
Location: Australia
Posts: 3,423
Re: Borg Warner gearbox problem

Quote:
Originally Posted by Jacob Vetter View Post
Thanks!
You have a good point in output flange spline, they were worn when we changed the damper plate. I just now found out that the prop is also to big for the engine/gear/boat, so thats also a problem. I have a reduction gear, Borg Warner Velvet Drive 72C, gearing: 2.10:1
The Autoprop is by far the least likely cause of the noise on engagement, assuming itís in good condition with no seized bearings or damaged blades. An Autoprop thatís ďtoo bigĒ is an interesting subject, Autoprops are self pitching so if the diameter was too large, theoretically it should adjust itself to the available power but I have no actual seatime with one despite having installed and re-raced the largest ( driven by a Perkins T6-354 with a 3:1 reduction) to the smallest, driven by hydraulic motors as part of a twin screw installation in a catamaran.
skipperpete is offline   Reply With Quote
Reply

Tags
autoprop, borg warner, ford lehman, gear, gearbox

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
Borg Warner Gearbox Ratio on Columbia 41 SanyaYachting Propellers & Drive Systems 1 20-07-2015 20:45
Borg Warner 71cr gearbox problems davitosan Engines and Propulsion Systems 15 21-12-2014 00:51
Borg Warner Gearbox Noisey Under Light Load GILow Engines and Propulsion Systems 11 23-04-2013 19:20
Borg Warner Gearbox Oil Cooler S/V Willow Engines and Propulsion Systems 3 11-10-2010 01:14
Borg Warner Velvet Drive spinning tomrobalo1 Propellers & Drive Systems 10 31-03-2009 20:41

Advertise Here


All times are GMT -7. The time now is 18:19.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.