LT 155 lawn tractor no spark
Results 1 to 7 of 7
Like Tree1Likes
  • 1 Post By jmoe107

Thread: LT 155 lawn tractor no spark

  1. Top | #1

    Join Date
    Jul 2014
    Last Online
    08-16-2014 @ 11:08 AM
    Location
    wisconsin
    Posts
    4
    Thanks
    0
    Thanked 0 Times in 0 Posts

    LT 155 lawn tractor no spark

    Running out of options here. mower would only turn over, checked compression first, 90lbs (compression release for start up?) Getting fuel. Grounded plug to block saw no spark, tested primary coil, secondary coil, rectifier, brake switch, seat switch and all relays check ok. still no spark? it is a kohler 15 hp

  2. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

  3. Top | #2
    k91
    k91 is offline

    Join Date
    May 2013
    Last Online
    02-26-2016 @ 06:51 AM
    Location
    PA
    Posts
    148
    Thanks
    12
    Thanked 25 Times in 23 Posts


    Best way to test the coil is to remove the ground wire at the coil itself and crank it again. If still no spark then yes most likely the coil is bad. It could be something really weird like the flywheel magnets lost magnetism but that is really unlikely. Is the flywheel key in place and in tact? Good luck.

  4. Top | #3

    Join Date
    Jul 2014
    Last Online
    08-16-2014 @ 11:08 AM
    Location
    wisconsin
    Posts
    4
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Quote Originally Posted by k91 View Post


    Best way to test the coil is to remove the ground wire at the coil itself and crank it again. If still no spark then yes most likely the coil is bad. It could be something really weird like the flywheel magnets lost magnetism but that is really unlikely. Is the flywheel key in place and in tact? Good luck.
    thankyou for the welcome,
    I removed the single white wire from the secondary that leads back to the brake safety switch and ignition and saw no spark? ( the secondary coil is new by the way). fly wheel magnets looked good as well as did the keyway when I had flywheel off examining primary coil which ohms tested good as well.
    Last edited by jmoe107; 07-24-2014 at 03:22 PM.

  5. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

  6. Top | #4
    k91
    k91 is offline

    Join Date
    May 2013
    Last Online
    02-26-2016 @ 06:51 AM
    Location
    PA
    Posts
    148
    Thanks
    12
    Thanked 25 Times in 23 Posts
    Coil is gapped correctly? 0.010 should get it to run.

  7. Top | #5

    Join Date
    Jul 2014
    Last Online
    08-16-2014 @ 11:08 AM
    Location
    wisconsin
    Posts
    4
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Quote Originally Posted by k91 View Post
    Coil is gapped correctly? 0.010 should get it to run.
    yep .010. is their another safety switch other than the 2 I checked, maybe one for mower deck engagement somewhere that thinks deck is engaged? nope just saw that one doesn't spin over with mower deck engaged going to assume that safety is functioning correctly, im at a loss. maybe the new secondary coil my neighbor put on is actually bad new out of the box?
    Last edited by jmoe107; 07-24-2014 at 03:43 PM.

  8. Top | #6
    56FordGuy's Avatar
    Join Date
    Jan 2012
    Last Online
    Yesterday @ 12:24 PM
    Location
    Wyoming
    Posts
    10,023
    Thanks
    480
    Thanked 1,654 Times in 1,086 Posts
    Safety switches generally prevent the engine from turning over at all. If you're cranking with no spark I would expect the safety systems to be functioning correctly.
    -Blake

    Your mileage may vary.

    JD 6410
    Some other stuff

    YouTube- Life in Wyoming

  9. Top | #7

    Join Date
    Jul 2014
    Last Online
    08-16-2014 @ 11:08 AM
    Location
    wisconsin
    Posts
    4
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Quote Originally Posted by 56FordGuy View Post
    Safety switches generally prevent the engine from turning over at all. If you're cranking with no spark I would expect the safety systems to be functioning correctly.
    well the problem has been solved. the owner had changed the secondary coil but put it in upside down. and it really looks the same sitting either way so I never noticed it but in the end I said your new coil must be bad which it technically was.
    felixm22 likes this.

  10. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

Bookmarks

Posting Permissions

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