Kawaski Engine timing

Discussion in 'Mechanic and Repair' started by Jeff911oc, Sep 18, 2006.

  1. Jeff911oc

    Jeff911oc LawnSite Member
    Posts: 9

    I have a Kawaski FC420V engine that jumped time due to the bearing wearing out and allowing the crankshaft to slip. I took the engine apart and have replaced all the worn out parts but I can't get it to start. All it wants to due is backfire. I'm sure the timing is off. What would be the correct timing for this engine.
     
  2. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Posts: 1,164

    First off WELCOME to LAWNSITE:drinkup:
    There is a dot on the crank gear and it has to line up with the dot on the cam gear this is how the timing is set the crank gear is keyed so it doesn't spin so make sure it is still intact. Hope this helps
     
  3. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    How about a picture......

    FC 420 Cam Timing.jpg
     
  4. khouse

    khouse LawnSite Bronze Member
    Posts: 1,465

    if your cam timing was out due to a major malfunction then you may have bent a valve. did you check to see if the valves were bent?
     
  5. Jeff911oc

    Jeff911oc LawnSite Member
    Posts: 9

    Yes I checked them. I had a Bearingthat wore out and it allowed play between the crank shaft and the cam shaft and allowed the to slip
     
  6. khouse

    khouse LawnSite Bronze Member
    Posts: 1,465

    man that was some bearing failure. did the balls fly out of it? now when you say you think the timing is out - do you mean the electrical firing or mechanical cam timing?
     
  7. Jeff911oc

    Jeff911oc LawnSite Member
    Posts: 9

    what I determined that happened is the are some bearing sleaves that wore out and it allowed the camshaft to slip and the lobe on the camshaft was knocking against the connecting rod. It eventually slipped enough that when I tried to start it it totally locked up. I thought that was it and when I took it apart I could get about 4 revolutions in either direction on the chankshaft before the lobe would hit the connecting rod. I took the whole thing apart and replaced the worn out sleaves and also replace the main bearing and can turn the crankshaft forever with no interference at all.

    I mounted it back on the mower and all it wants to due is backfire when I try to start it so I think the timing is off.
     
  8. khouse

    khouse LawnSite Bronze Member
    Posts: 1,465

    when you put it back together do you remember if you alined the referrence marks on the crank and cam? did you pull the head off? what did the engine do before it quit? ie,run good,rattle,smoke ect?
     
  9. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    Before you tear back into the engine check the flywheel key, When the engine locked up it very well could have sheared the key which would cause ignition timing to be off.
     
  10. Jeff911oc

    Jeff911oc LawnSite Member
    Posts: 9

    The engine ran good before it locked up. I heard a knocking sound (which was the camshaft lobe hitting the connecting rod) and I heard I pitch sound that to me sounded like a spun bearing. It did not smoke and it had a small oil leak around th sump gasket. It was running before it locked up. I shut it off because I was done and then went to start it again whe it locked up..Lucky me it wasn't running what that happened it probably would have broke something more expensive. I also pulled off the head to look at the valves and the top of the piston and everthing looked normal.
     

Share This Page