Zf 5M Transmission failed, What is the replacement? - SailNet Community
 
LinkBack Thread Tools
post #1 of 2 Old 08-05-2009 Thread Starter
Junior Member
 
Join Date: Aug 2009
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Zf 5M Transmission failed, What is the replacement?

Just pulled a failing 5M transmission off a Universal (Westerbeke) M20. Looks like $1250 to rebuild, but a 6M or 10M may cost not much more.

The 6M and 10M are a little longer (.95").

Have these been a satisfactory replacement for the 5M?

The first 5M failed after 50 hours. It was warranty replaced by Universal. That one failed after 100 hours. We determined that the prop was not properly engineered (lugging the engine). That failed 5M was rebuilt after re-propping. Now 600 hours later that rebuilt transmission is toast.

The re-propping allowed easy cruising at 2500-3000 rpm. At 3500 rpm the transom would get a little sooty.

Any recommendations?

Eric Johnson
ericseroijohnson is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 2 Old 09-07-2009
Senior Member
 
Join Date: Oct 2007
Location: Beacon Falls CT USA
Posts: 310
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
I replaced a Hurth 50 with a zf 6. The H50 was the same spec as the zf5, so i think my experience may be of interest.

As you mention, the zf 6 is about an inch longer, so I did have my shaft shortened and rekeyed to keep the prop right where it was. I had the good fortune of having enough room aft of the engine, so that the longer unit did not represent a major structural issue. I did have to redrill the cable-mount plate to adapt to a new bolt configuration - you may or may not have this issue if you're going from a zf 5.

Detailed design specs are available on the website for zf - don't have it handy, but if i find it I'll post it here. These were helpful in resting my concerns on fit.

I will also post a reference of the vendor that sold me the replacement (new) zf6 - it was surprisingly close in price to a rebuild I was considering - something like $1,200/usd. I was also able to get $150 back on my H50 from a local deisel mechanic in CT.

The unit has been in all season without an issue. I'm thrilled with it - and with the fact that I didn't botch anything in the process (e.g. shaft alignment).

Good luck.
Pub911 is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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



Similar Threads
Thread Thread Starter Forum Replies Last Post
Transmission Replacement?? Vitesse473 Gear & Maintenance 13 2 Weeks Ago 07:15 AM
transmission question almostbroke Gear & Maintenance 10 09-17-2012 09:56 AM
Transmission woes sailrmon Gear & Maintenance 2 10-15-2008 05:18 PM
Hurth Transmission John & Heather Newport 4 01-12-2007 10:09 AM
Breakdown in Paradise Mark Matthews Gear and Maintenance Articles 0 04-29-2002 08:00 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

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