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  1. #1
    Member JDKiotiboys3's Avatar
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    Jun 2011
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    35
    Location
    Mooresville In.
    Tractor
    Kioti LK3054,John Deere 420 L&G

    Default JD 420 Rebuild

    I'm thinking about rebuilding the B-Series engine in the 1984 420. I'm not a mechanic. Anyone have a rough estimate on the cost of the rebuild? Anyone in the area of Mooresville IN that would be interested in doing it? Ha Thanks

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  2. #2
    Silver Member
    Join Date
    Jun 2013
    Posts
    225
    Location
    N. GA
    Tractor
    LX188/445/755

    Default Re: JD 420 Rebuild

    Quote Originally Posted by JDKiotiboys3 View Post
    Anyone have a rough estimate on the cost of the rebuild?
    I suspect it's an Onan engine. The cost might be more than the mower is worth.
    I know some of the JD engines are terribly expensive to buy parts for, and with labor it gets ridiculous.

    If you can find the engine part/serial number, Google it and see what pops up.
    A place called partstree sells some replacement engines.

    If you could get REAL lucky you might find a used engine off a mower that has been parted out.

  3. #3
    Member JDKiotiboys3's Avatar
    Join Date
    Jun 2011
    Posts
    35
    Location
    Mooresville In.
    Tractor
    Kioti LK3054,John Deere 420 L&G

    Default

    Hey thanks. It is the original B series Onan engine

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  4. #4
    Platinum Member
    Join Date
    Mar 2008
    Posts
    599

    Default Re: JD 420 Rebuild

    If your intending on keeping the 420 I would look at what could substitute for the Onan. They were good in their day but expensive and scarse parts make them problematic.
    I wouldn't buy one just for that reason. There are too many Yanmars around that seem to last forever with proper maint.

  5. #5
    Veteran Member David_Kb7uns's Avatar
    Join Date
    Aug 2005
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    1,080
    Location
    Willamette Valley Oregon
    Tractor
    Kubota X 4

    Default Re: JD 420 Rebuild

    Neighbor short blocked his 420 a few years ago and not cheap, there are companies doing a repower kit with a Briggs or Honda engine $1750-$2100 range, I told him he should of went with the 430 it would still be going. Only reason he keeps it is the huge bagger otherwise his kubota BXs are more powerful.

    David Kb7uns
    Grand L3130GST LA723 Loader, ATI grapple, ATI grapple bucket, WR Long front remote, Kubota rear remotes, Bradco 408 Backhoe with thumb, 60"KK brush hog, 60" RM Finish Mower, Speeco Post Auger, 72" KK rear blade, 60" box blade
    BX2230 LA211, RCK60, GCK60 Bagger,42"Land Pride Tiller, XB BB, XB RB, rake, Fimco 3PT sprayer
    G2160 RCK60 Mower
    RTV1100 Orange, Work Lights, Front Rear Winch,Rear Screen, High Mount air cleaner, water seperator
    2010 Polaris RZR 800 S
    2007 CAN AM Outlander 800 LTD

  6. #6
    Silver Member
    Join Date
    May 2005
    Posts
    222

    Default

    Smallenginewarehouse.com. They sell a lot of repower kits for older deere mowers and their based out of Indiana.

  7. #7
    New Member
    Join Date
    Oct 2013
    Posts
    7
    Location
    Westminster, MD
    Tractor
    1990 John Deere 420

    Default Re: JD 420 Rebuild

    I am in the process of putting a Honda GX690 in mine, less wiring and headaches than the old Onans. I got mine from SEW as well.

  8. #8
    New Member JD420's Avatar
    Join Date
    Oct 2012
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    23

    Default

    Just purchased the Briggs and straton vanguard kit for small engine warehouse. It seems to run well. But less than pleased with the install kit. The PTO spacers were not even close to the right size and the throttle cable was way off also. The engine has alot more power than the original Onan but as for the longevity of its life span I can't see it lasting 25 years as the original Onan did. Had any one else had any similar experience with this kit. Thanks

  9. #9

    Default Re: JD 420 Rebuild

    JD420 A bunch of the Onan engines didn't make it twenty-five years. Take care of the vanguard, keep it clean and oiled and don't worry about it. Enjoy more power on less gas and more importantly LESS NOISE. Let us know when it kicks off. You will have to admit you were wrong if it does last for 25.

  10. #10
    New Member JD420's Avatar
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    Oct 2012
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    Default

    Hopefully you are right and it last a long time. I'm a stickler for good maintenance. Can't stand to see nice equipment or vehicles not taken care of. I haven't found it to be much more fuel efficient though. But I also mow a bit faster due to plenty of power to spare. The old onan was very tired and with a wasted cam bearing it was also put of time. But can't complain with 1900 hrs on the clock I would be worn out also.

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