Jump to content

Nominations for Tractor of the Month
Garden Tractors and Parts on eBay



Photo
- - - - -

420 Jd?


  • Please log in to reply
9 replies to this topic

#1 LilysDad OFFLINE  

LilysDad

    Cat Lover

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 10443
  • 9,652 Thanks
  • 7,677 posts
  • Location: N. Illinois, DeKalb County

Posted July 09, 2014 - 03:36 PM

     Back when, at least 15 years ago, the Illinois Tollway had JD GTs to mow the oasis and toll areas. They had a lot of trouble with them. Of the 12 tractors, 11 had issues with valve seats coming out.

     These were a 420 model and I was told they had Briggs twin engines. I was just looking this up on TractorData and they said it had an Onan engine.

 

     Is anyone familiar with any of this?

    



#2 richwoodrocket ONLINE  

richwoodrocket

    16 year old JD lover

  • Senior Member
  • Contributor
  • Member No: 57205
  • 147 Thanks
  • 177 posts
  • Location: Hamburg, NY

Posted July 09, 2014 - 04:31 PM

They have onan engines. They must've been repowered 420s they were using.


Sent from my iPhone using Tapatalk
  • LilysDad said thank you

#3 Trav1s OFFLINE  

Trav1s

    Got points?

  • Senior Member
  • Member No: 5472
  • 2,603 Thanks
  • 3,750 posts
  • Location: Cedar Rapids, IA

Posted July 09, 2014 - 04:55 PM

Wonder why Briggs?

 


Edited by Trav1s, July 09, 2014 - 04:56 PM.


#4 LilysDad OFFLINE  

LilysDad

    Cat Lover

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 10443
  • 9,652 Thanks
  • 7,677 posts
  • Location: N. Illinois, DeKalb County

Posted July 09, 2014 - 05:47 PM

They were bought new. Did JD have another model with Briggs twins? Did Onan have a valve seat issue?



#5 Rock farmer OFFLINE  

Rock farmer
  • Senior Member
  • -GTt Supporter-
  • Member No: 10759
  • 1,119 Thanks
  • 1,177 posts
  • Location: York Maine

Posted July 09, 2014 - 07:15 PM

Onan have valve seat issues.
Especially the cylinder closest to the driver.

Joe
  • LilysDad said thank you

#6 Cat385B ONLINE  

Cat385B

    Therapy CAT

  • Senior Member
  • Contributor
  • Member No: 8002
  • 11,740 Thanks
  • 8,913 posts
  • Location: MN

Posted July 09, 2014 - 08:53 PM

During that era, the only JD with a Briggs was the least expensive LT models.
  • LilysDad said thank you

#7 dave8338 OFFLINE  

dave8338

    Member

  • Senior Member
  • Member No: 6698
  • 196 Thanks
  • 374 posts

Posted July 15, 2014 - 07:02 PM

During that era, the only JD with a Briggs was the least expensive LT models.

LOL go figure !  No valve seat issues with ANY of the Briggs engines that I have.  Loves me the old L series opposed twins.  They just run and run and run and....   :worshippy1:


  • LilysDad said thank you

#8 olcowhand OFFLINE  

olcowhand

    Red Tractor Nut & Diesel Addict

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Sponsor
  • Contributor
  • Member No: 20
  • 35,648 Thanks
  • 29,840 posts
  • Location: South Central Kentucky

Posted July 15, 2014 - 07:44 PM

I've had at least a dozen Onan engines, and never had a valve seat issue with any of them.  In that same time frame, I've had at least 2 Briggs with floating valve seats.


  • dave8338 and LilysDad have said thanks

#9 dave8338 OFFLINE  

dave8338

    Member

  • Senior Member
  • Member No: 6698
  • 196 Thanks
  • 374 posts

Posted July 15, 2014 - 07:57 PM

I've had at least a dozen Onan engines, and never had a valve seat issue with any of them.  In that same time frame, I've had at least 2 Briggs with floating valve seats.

EXACTLY ! !  I think it has more to do with "the luck of the draw".   :thumbs:



#10 DeadDeere420 OFFLINE  

DeadDeere420
  • New Member
  • Member No: 59221
  • 1 Thanks
  • 1 posts
  • Location: Cleveland Tennessee

Posted July 19, 2014 - 06:00 PM

I have a 420 and it came factory with the Onan P220g

I have had a valve seat go on the original block at about 1100 hours

The valve seats go when the engines aren't cared for properly

I was guilty of not keeping the cooling fins clean and I learned my lesson

 

If you have a 420 there are a couple of things that can be done to help prevent this

1) don't use gas with ethanol (ethanol cause problems with feul lines and carbs potentially leaning of the mixture)

2) Make sure you have the insulation sheet that goes on the firewall. This forces air flow through flywheel screen and under the engine shrouds

3) Use the Onan oil filter seal. It closes off a potential leak area between the filter and the sheet metal. This ios why the right side is the most common to fail
4) keep the cooling fins clean. I now use air pressure to blow the dirt and dust out of them

 

The Onan's are like any other engine. When properly maintained, they last. I didn't keep mine clean and I paid for it


  • Rock farmer said thank you




Top