The Jack's Small Engines Forum - Join Our Online Community
Jacks Small Engines Lawn Mower & Power Equipment Forums
Reply to post

onan gennerator blow back

Author
Post
Essentials Only Full Version
Junkman
New Member
  • Total Posts : 1
  • Scores: 0
  • Reward points: 0
  • Joined: 2020/06/03 15:35:30
  • Status: offline
2020/06/03 15:38:54 (permalink)
0

onan gennerator blow back

I have an onan gen set in a motorhome. was not getting fuel so I changed the carb then it tries to start, but soon blows fuel back out the carb. I suspect a burnt valve?? open to ideas before I pull it out.
Quote  #1

2 Replies Related Threads
    AVB
    Super Member
    • Total Posts : 1815
    • Scores: 71
    • Reward points: 0
    • Joined: 2017/06/21 16:35:48
    • Location: Elora, TN
    • Status: offline
    Re: onan gennerator blow back 2020/06/04 07:16:46 (permalink)
    0
    I haven't worked on any these genesets but you need it where you can access it. I am thinking these are L-head engine so the valve clearance probably closed up from wear which leading to valve not closing fully and fast enough.
    Quote  #2
    TownsendsFJR1300
    Super Member
    • Total Posts : 46
    • Scores: 0
    • Reward points: 0
    • Joined: 2020/06/06 11:12:03
    • Status: offline
    Re: onan gennerator blow back 2020/06/12 20:05:15 (permalink)
    0
    A "leak down" test will give you a good idea of the health of the engine and point you in the right direction of any issues. 
     
    IE, air coming out the carb(intake valve) would indicate an intake valve too tight/ leaking, etc..

    Scott
    Quote  #3
    Jump to:
    Copyright © 1994 - 2016 Jacks Small Engine & Generator Service, LLC