Page 1 of 2 12 LastLast
Results 1 to 10 of 12
  1. #1

    Join Date
    Mar 2018
    Posts
    16
    Location
    Rhode Island
    Mower
    Agco Allis

    Kubota B 4200 lost power

    Hi Guys need some help

    I have a 1995 Kubota B4200 4 wheel drive with a 2 cylinder 12 HP diesel engine with 812 hours. It has been loosing power

    Put a new fuel filter and no water in the fuel. Added diesel additive and let run for a while and no change

    Got any ideas

    Thank John O

  2. #2

    1,000 Post Club

    Join Date
    Aug 2015
    Posts
    1,627
    Location
    Kansas
    Mower
    Toro/Cub Cadet/Kubota

    Re: Kubota B 4200 lost power

    Does it only have one fuel filter?

  3. #3

    Join Date
    Mar 2018
    Posts
    16
    Location
    Rhode Island
    Mower
    Agco Allis

    Re: Kubota B 4200 lost power

    Quote Originally Posted by cpurvis View Post
    Does it only have one fuel filter?
    Yes only the one by the manual

  4. #4

    Join Date
    Jul 2013
    Posts
    698
    Location
    Michigan
    Mower
    Kubota, Lawnboys (5), Toro/Suzuki's (2), Honda HR17

    Re: Kubota B 4200 lost power

    Did you check to see if the valves are opening and closing by looking through the oil cap in the valve cover? I did hear of a Kubota engine pushing it's cam bearing out.

    I did have the bolt holding the pulley/harmonic balancer on the front of the crank back out (although this was on a Yanmar 2 cylinder diesel).

    Check the air filter? Did you bleed the fuel line after replacing the fuel filter?

    Other than the above, there's not a whole lot you can check on a diesel. It's possible to have a bad injector pump or injector or low compression,,,hard to tell without taking it to a Kubota dealer.

    Regards

    Jeff

  5. #5

    1,000 Post Club

    Join Date
    Aug 2015
    Posts
    1,627
    Location
    Kansas
    Mower
    Toro/Cub Cadet/Kubota

    Re: Kubota B 4200 lost power

    Quote Originally Posted by johno778@cox.net View Post
    Yes only the one by the manual
    Can you describe the problem in more detail?

    About the only things that will cause a diesel to lose power is lack of fuel, something wrong with the injection $ystem, damage to valves or overheating. Most of the time, it is simply lack of fuel. That's not to say it can't be an internal engine problem but most of the time, it's a lack of fuel.

    Did you bleed the fuel system after installing the new filter?

    Are you the original owner or is there a chance someone else took it upon himself to install an inline pre-filter that you haven't noticed?

    When it loses power, if you shut the engine off and restart, does the engine then run any better?

    Does it have full power when you first start it (from a cold condition)?

    What does the exhaust look like? Black smoke, no smoke, other? Smooth or irregular? If black, check your air filter.

    Is the fuel gravity fed or does it have a fuel pump to feed the injection pump?

    Any difference in the sound of the engine when it loses power?

    I am not a diesel tech but I've owned my fair share of diesels, both tractors and trucks, over the years. Loss of power, in my case, has always been a fuel filter that needed replaced. If your engine was running OK and suddenly developed this problem, that would be where I would look first.

  6. #6

    Join Date
    Jul 2013
    Posts
    698
    Location
    Michigan
    Mower
    Kubota, Lawnboys (5), Toro/Suzuki's (2), Honda HR17

    Re: Kubota B 4200 lost power

    I just Googled power loss on a small diesel and the one thing to add which hasn't already been mentioned is muffler plugged?

    Regards

    Jeff

  7. #7

    1,000 Post Club

    Join Date
    Aug 2015
    Posts
    1,627
    Location
    Kansas
    Mower
    Toro/Cub Cadet/Kubota

    Re: Kubota B 4200 lost power

    Good point about the muffler.

    jp1961, I didn't see your post above mine before I posted or mine would have been a lot shorter.

  8. #8

    1,000 Post Club
    jekjr's Avatar
    Join Date
    Jan 2013
    Posts
    1,966
    Location
    Monroeville, Alabama
    Mower
    Scag

    Re: Kubota B 4200 lost power

    Check your air filter. Many times they will stop up and cause air flow problems.

  9. #9

    Join Date
    Mar 2018
    Posts
    16
    Location
    Rhode Island
    Mower
    Agco Allis

    Re: Kubota B 4200 lost power

    Can you describe the problem in more detail?

    About the only things that will cause a diesel to lose power is lack of fuel, something wrong with the injection $ystem, damage to valves or overheating. Most of the time, it is simply lack of fuel. That's not to say it can't be an internal engine problem but most of the time, it's a lack of fuel.

    Did you bleed the fuel system after installing the new filter? No I did not I filled the bowl. The problem was before the filter that is one of the reasons I changed the filter

    Are you the original owner or is there a chance someone else took it upon himself to install an inline pre-filter that you haven't noticed? I am not the original owner and I looked around and did not see anything unusual.

    When it loses power, if you shut the engine off and restart, does the engine then run any better?. The engine runs the same from start up to shut down

    Does it have full power when you first start it (from a cold condition)? No the same all the time

    What does the exhaust look like? Black smoke, no smoke, other? Smooth or irregular? If black, check your air filter. First start it is a little black and then just about none

    Is the fuel gravity fed or does it have a fuel pump to feed the injection pump? I believe it is a fuel pump

    Any difference in the sound of the engine when it loses power? The lost power is from is from start up

    I am not a diesel tech but I've owned my fair share of diesels, both tractors and trucks, over the years. Loss of power, in my case, has always been a fuel filter that needed replaced. If your engine was running OK and suddenly developed this problem, that would be where I would look first. Correct that is why I changed the filter but I ran it yesterday and it seemed to run better after the additive may have cleaned something out not real good but it definetly was better.

    I put a diesel additive in and ran it for a while with no change, yesterday I went out to get a load of fire wood and it seemed to run a little better where I had some power maybe not full but more. So maybe the injectors are dirty and this additive will clean them out I HOPE! the additive is Power Service, Diesel Kleen injector cleaner and performance improved. I HOPE THIS WORKS

    thanks for your help and I will add to this in a few days THANK YOU did not know how to change color to the text or it would have looked better



    Reply With Quote Reply With Quote Multi-Quote This Message .

    --------------------------------------------------------------------------------



    Yesterday, 02:49 PM
    #6


    jp1961











    jp1961 is online now

  10. #10
    BlazNT's Avatar
    Join Date
    Apr 2012
    Posts
    6,973
    Location
    Missouri
    Mower
    RZ5424

    Re: Kubota B 4200 lost power

    Can you explain your last comment please?
    Chuck
    We Do Not Stop Playing When We Grow Old
    We Grow Old If We Stop Playing

Similar Threads

  1. Briggs started backfiring, lost power and quit.
    By bfield3 in forum Briggs & Stratton Forum
    Replies: 5
    Last Post: 09-03-2018, 08:03 PM
  2. Briggs and Stratton lost power
    By bondjohnston in forum Mower & Equipment Operation
    Replies: 1
    Last Post: 08-03-2018, 06:44 PM
  3. Repairs Drivers (hydraulic) have lost power!
    By mahto in forum Mower & Equipment Operation
    Replies: 4
    Last Post: 10-06-2016, 03:33 PM
  4. Hit bump; lost power
    By LittleWing in forum Briggs & Stratton Forum
    Replies: 3
    Last Post: 07-03-2016, 03:00 PM
  5. Husqvarna 455 Chainsaw - Lost Power ?
    By MBTRAC in forum Small Engine & Mower Repair
    Replies: 7
    Last Post: 06-10-2013, 01:31 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •