Long winded final drive idea - BMW Luxury Touring Community
 
LinkBack Thread Tools Display Modes
post #1 of 5 Old Jul 14th, 2008, 3:49 pm Thread Starter
Senior Member
 
fpmlt's Avatar
 
Join Date: Jan 2008
Posts: 2,175
Long winded final drive idea

I just changed my final drive fluid, and got to thinking about a wild idea. Prior to changing it I did a 25 mile run just to warm it up and to get stuff in suspension prior to the drain. I was surprised at how warm the fluid was after only 25 miles, but that is likely a function of a heavy load on an extremely small amount of fluid. And, I'm a believer in the idea that wear causes wear, so the sooner one replaces contaminated fluid the better, especially if there's a limited quantity to begin with.
So here's my idea/thought. Could a guy design a system that would pull fluid, perhaps by electric pump, from the drain, run it through a cooler and perhaps small filter, then feed it back though the fill plug? The advantage would be: adding fluid to the system, cooling and filtering. Don't know how cumbersome or expensive it would be, or if it's even worth the time it took me to think this one up. Just thought I'd throw it out there.
fpmlt is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old Jul 14th, 2008, 4:18 pm
Senior Member
 
CharlieVT's Avatar
 
Join Date: Jun 2002
Location: The Deep South of Vermont
Posts: 4,389
Thumbs down Re: Long winded final drive idea

Ten Valuable Style Points awarded for creativity and thinking outside the box: A circulating, filtering, cooling, oil system for the final drive.

My thoughts:
You could do all that and still suffer a final drive failure.
Not to mention, you are going to add a lot of un-sprung weight to the bike, or add a bunch of flexible hoses and a very complex system. And you will spend a huge amount of time designing and trouble-shooting the system.

Having rebuilt a few final drives, I would submit that there would be a lot less work in just preemptively rebuilding your final drive with a new bearing, say, every 20-30K miles (and that is being ridiculously conservative). Just rebuild it correctly, measure preload, don't stress the bearing pressing it onto the crown wheel, and lube it with any gear oil better than WD-40.

Seriously, cudos for thinking of how to prevent a final drive failure, but remember KISS (Keep It Simple Sam) too.





Quote:
Originally Posted by fpmlt
I just changed my final drive fluid, and got to thinking about a wild idea. Prior to changing it I did a 25 mile run just to warm it up and to get stuff in suspension prior to the drain. I was surprised at how warm the fluid was after only 25 miles, but that is likely a function of a heavy load on an extremely small amount of fluid. And, I'm a believer in the idea that wear causes wear, so the sooner one replaces contaminated fluid the better, especially if there's a limited quantity to begin with.
So here's my idea/thought. Could a guy design a system that would pull fluid, perhaps by electric pump, from the drain, run it through a cooler and perhaps small filter, then feed it back though the fill plug? The advantage would be: adding fluid to the system, cooling and filtering. Don't know how cumbersome or expensive it would be, or if it's even worth the time it took me to think this one up. Just thought I'd throw it out there.
CharlieVT is online now  
post #3 of 5 Old Jul 14th, 2008, 4:22 pm
Senior Member
 
Mike_H's Avatar
 
Join Date: Feb 2004
Location: New Berlin, WI, USA
Posts: 269
Short-Winded Final Drive Idea

Use belt drive. Costs less, lasts longer.

Inside my 60 year old body is a 35 year old brain wondering what the hell happened.
2005 K1200LT
2005 Suzuki Burgman
BMWMOA #130574
Mike_H is offline  
 
post #4 of 5 Old Jul 14th, 2008, 4:30 pm
Senior Member
 
myk_edwards's Avatar
 
Join Date: Apr 2004
Location: Gloucester, Gloucestershire, England UK
Posts: 1,474
Re: Long winded final drive idea

Quote:
Originally Posted by CharlieVT
Having rebuilt a few final drives, I would submit that there would be a lot less work in just preemptively rebuilding your final drive with a new bearing, say, every 20-30K miles (and that is being ridiculously conservative). Just rebuild it correctly, measure preload, don't stress the bearing pressing it onto the crown wheel, and lube it with any gear oil better than WD-40.
Hi,

I'm close to 24K on my 2001 LT. I replace the FD Oil last week with Cookie (first time for me, all other work done at the shop) and my oil came out crystal clear, looked like new. Nothing to talk about on the drain plug, but am interested in your idea of rebuilding the FD every 20-30K to avoid a failure.

Whats the cost of doing this in parts and time. I agree, that to be able to do this work at your leisure, perhaps as a winter project does hold merit, better than being on the side of a road 1500 miles from home.

Cookie had a great idea, about having a refurbished final drive unit complete with all tools needed to do the job available to be FedExed at a moments notice to anyone who had suffered an FD failure, maybe this idea holds water too?

Rgds
Mike

"For those that know, no explanation is needed,
For those that don't, no explanation is possible."

2001 K12 LT Toscana Green AKA Baby Sh*t Green
Kawasaki EN500 - been sold on!
Hardtail Chopper ( Honda CB 500 engine) in a box still!
myk_edwards is offline  
post #5 of 5 Old Jul 14th, 2008, 5:50 pm
Member
 
DLBass's Avatar
 
Join Date: Apr 2008
Location: Desborough, Northants., UK
Posts: 36
Garage
Re: Long winded final drive idea

Quote:
Use belt drive. Costs less, lasts longer.
Umm, not so sure about that. My FLHTC with 24,000 on the clock snapped the belt rolling back out of a parking space at Heathrow Airport last summer. Just what I needed after getting off the red eye from JFK. A tow home and 500 ($1000) later I was moblie again.

Just my 500 worth you understand.

David

You can't guarantee tomorrow, so do it today!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
DLBass is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the BMW Luxury Touring Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
What to do with a "used" FD jers99lt K1200LT 23 Dec 9th, 2011 10:31 am
Wanted: trashed final drive CharlieVT K1200LT 0 Apr 23rd, 2008 8:41 am
Failed final drive ezriderfrank K1200LT 1 Mar 28th, 2008 10:27 pm
So what is a final drive worth ? Patric K1200LT 12 Jun 27th, 2007 3:47 pm
Final Drive no longer maintenance free for 2007+ models with new style rear drive eljeffe K1200/1300GT (The Next Generation) 4 Sep 7th, 2006 1:41 pm

Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome