Results 1 to 7 of 7
  1. #1

    Default re-engine jd4300

    How difficult would it be to re-engine a JD 4300 cut with a Yanmar 4tnv78? The stock engine is a 3tne84, not rebuildable. (Used 3tne84's are rare.)

  2. #2
    Silver Member wthompson's Avatar
    Join Date
    Jan 2012
    Posts
    153
    Location
    Southeast, GA
    Tractor
    John Deere 4600HST

    Default Re: re-engine jd4300

    Not sure about what all would match/bolt up from one to the other but i did look on jdparts.com for the engine block and found one for the 4300 here: AM878597 - Tractor-Part. The JD part # is AM878597 for the cylinder block, reuse your crank, pistons etc. With new gaskets and rings etc.?
    Also found this one for $850.00 CYLINDER BLOCK FITS: 790 JOHN deere CAST # 3TNE84.

  3. #3

    Default Re: re-engine jd4300

    Thank you!

  4. #4
    Elite Member dfkrug's Avatar
    Join Date
    Feb 2004
    Posts
    4,354
    Location
    NorCal
    Tractor
    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: re-engine jd4300

    Quote Originally Posted by kak View Post
    The stock engine is a 3tne84, not rebuildable.
    You said your dealer told you the engine is not rebuildable. Based on what evidence?
    You can buy .25mm oversize pistons and bore the block if it is worn out. Did
    they take is apart and measure the bores?

    If you do try to substitute another Yanmar engine, you need to be sure that it
    will drive your hyd pump and bolt up to your bell housing.
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

  5. #5

    Default Re: re-engine jd4300

    Thanks for your reply. The jd dealer said the wear was too much on the cylinders to allow for re-sleeving. I think the larger engine will drive the hydraulic pump, but I need to check on the bell housing issue.

  6. #6
    Elite Member dfkrug's Avatar
    Join Date
    Feb 2004
    Posts
    4,354
    Location
    NorCal
    Tractor
    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: re-engine jd4300

    Quote Originally Posted by kak View Post
    The jd dealer said the wear was too much on the cylinders to allow
    for re-sleeving. I think the larger engine will drive the hydraulic pump, but I need to
    check on the bell housing issue.
    These engines do not come with sleeves. JD offers only one oversize piston and it is
    possible the block is worn too much. Technically, you could add sleeves if the block is
    worn too much, but that adds a lot in cost, and you will need to deal with a specialty
    maker of sleeves.

    Yanmar engines are made for many applications, not just tractors. The JD4300 Yanmars
    drive their implement hyd pumps off gears in the front of the engine and have a
    front cover to acommodate this drive. That is an important consideration.
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

  7. #7
    New Member
    Join Date
    Nov 2012
    Posts
    1
    Location
    United States
    Tractor
    john deere

    Default Re: re-engine jd4300

    if you won't to sell your old engine let me know

Similar Threads

  1. JD4300
    By djh1121 in forum John Deere Buying/Pricing
    Replies: 1
    Last Post: 11-28-2005, 09:31 PM
  2. JD4300 problem
    By EChris in forum John Deere Owning/Operating
    Replies: 5
    Last Post: 11-09-2004, 03:48 PM
  3. *****KUB3010 vs JD4300****
    By estamas142 in forum Buying/Pricing/Comparisons
    Replies: 5
    Last Post: 03-03-2002, 11:24 PM
  4. JD4300
    By walls in forum John Deere Owning/Operating
    Replies: 4
    Last Post: 10-26-2000, 08:25 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2013 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.