The Jack's Small Engines Forum - Join Our Online Community
Reply to post

Hard Starting

Author
Tomfoolery3
New Member
  • Total Posts : 2
  • Scores: 0
  • Reward points: 0
  • Joined: 2018/10/16 11:02:13
  • Status: offline
2018/10/16 11:11:25 (permalink)
0

Hard Starting

I have a Briggs and Stratton Model #31S777-0001-G1 15.5 horsepower engine.  The starter won't turn until I physically crank the engine, then, the starter cranks the engine and starts the motor.  Why won't the starter crank the motor through it's compression cycle?

3 Replies Related Threads

    AVB
    Super Member
    • Total Posts : 693
    • Scores: 31
    • Reward points: 0
    • Joined: 2017/06/21 16:35:48
    • Location: Elora, TN
    • Status: offline
    Re: Hard Starting 2018/10/16 11:19:24 (permalink)
    0
    One of two reasons. Either
    1. The valves are needing adjusting
    2. Or the ACR on the camshaft has broken.
    ACR = Automatic Compression Release
     
    And it is quite common for the ACR on the 793880 camshaft to break but first check the valve clearance as is more common to be out of adjustment.
    Tomfoolery3
    New Member
    • Total Posts : 2
    • Scores: 0
    • Reward points: 0
    • Joined: 2018/10/16 11:02:13
    • Status: offline
    Re: Hard Starting 2018/10/16 12:11:23 (permalink)
    0
    Are there instructions somewhere to adjust the valves?
    AVB
    Super Member
    • Total Posts : 693
    • Scores: 31
    • Reward points: 0
    • Joined: 2017/06/21 16:35:48
    • Location: Elora, TN
    • Status: offline
    Re: Hard Starting 2018/10/16 13:44:25 (permalink)
    0
    IN .003-.005 EX .005-.007

    Once valves are check for the ACR bump of the intake valve @tdc of  compression stroke. If not present after valve are adjusted then the camshaft is broken and needs replacing.
    Jump to:
    Copyright © 1994 - 2016 Jacks Small Engine & Generator Service, LLC