15hp kaw valves

Discussion in 'Mechanic and Repair' started by ProMo, Oct 18, 2003.

  1. ProMo

    ProMo LawnSite Bronze Member
    Posts: 1,468

    my 36 ex tthp is running rough and missing a small strip of grass on the left side sounds like it is losing power does anyone know what the valves should be set at ?
     
  2. NCSERVICE

    NCSERVICE LawnSite Member
    Posts: 206

    if it is a fh500v the intake should be at .002in and the exaust should be at.004in. torque the valve rocker lock screws to 61 in lb
     
  3. ProMo

    ProMo LawnSite Bronze Member
    Posts: 1,468

    its a fh451v
     
  4. ProMo

    ProMo LawnSite Bronze Member
    Posts: 1,468

    anyone???
     
  5. NCSERVICE

    NCSERVICE LawnSite Member
    Posts: 206

    There ya go buddy.

    Specifications
    Item Service Limit
    FH451V, FH500V, FH531V
    Cylinder Head:
    Cylinder compression (MIN) [390 kPa (57 psi)] (MIN)
    Cylinder head warp 0.05 mm (0.002 in.)
    Valves:
    Valve head thickness Intake, Exhaust 0.35 mm (0.014 in.)
    Valve stem runout Intake, Exhaust 0.05 mm (0.002 in.)
    Valve stem diameter Intake 5.95 mm (0.0234 in.)
    Exhaust 5.93 mm (0.0233 in.)
    Valve guide inside diameter Intake, Exhaust 6.08 mm (0.239 in.)
    Valve spring free length Intake, Exhaust 31.0 mm (1.22 in.)
    Rocker arm push rod rounout Intake, Exhaust 0.5 mm (0.02 in.)
    Cylinder, Piston
    Piston diameter 67.79 mm (2.669 in.)
    Piston ring/groove clearance Top 0.15 mm (0.006 in.)
    Second 0.12 mm (0.005 in.)
    Piston ring thickness Top, Second 1.40 mm (0.055 in.)
    Piston ring end gap Top 0.70 mm (0.028 in.)
    Second 0.78 mm (0.031 in.)
    Oil 1.05 mm (0.041 in.)
    Piston pin outside diameter 15.96 mm (0.628 in.)
    Piston pin hole inside diameter 16.08 mm (0.633 in.)
    Connecting rod small end inside diameter 16.05 mm (0.632 in.)
    Cylinder inside diameter: Standard Cylinder 68.10 mm (2.681 in.)
    0.50 mm Oversize 68.60 mm (2.701 in.)
    Cylinder bore out round 0.056 mm (0.0022 in.)
    Item Standard
    FH451V, FH500V, FH531V
    Valve clearance Intake, Exhaust 0.075 0.125 mm (0.003 0.005 in.)
    Valve seating surface angle Intake, Exhaust 45_
    Valve seating surface width Intake, Exhaust 0.6 0.9 mm (0.024 0.035 in.)
    Valves guide inside diameter Intake, Exhaust 6.00 6.012 mm
    (0.2362 0.2367 in.)
    Cylinder bore diamter standard cylinder
    Standard cylinder 68.00 67.98 mm
    (2.677 2.676 in.)
    0.50 mm Over size 68.50 68.48 mm
    (2.697 2.696 in.)
     
  6. ProMo

    ProMo LawnSite Bronze Member
    Posts: 1,468

    thank you NCSERVICE the mower has got a loud tapping noise so I believe the valves are needing adjustment, my father in law is a mechanic for a large equip rental co but they dont work on kaw he services mainly kohler and honda. Ill let him decipher all of this, he said if the valves are not adjusted right it could be robbing hp thanks again
     
  7. ProMo

    ProMo LawnSite Bronze Member
    Posts: 1,468

    finally got it running exmarks distributor was full of !@## saying my frame was bent bla bla bla . all four valves were set at .o14 my father in law said it probably came from the factory like that and he didnt think they were ever set right he also said he thinks the dealer put the wrong size plugs in it it made a huge difference cutting my lawn ill test it more next week to bad it got 3 years of use before i saw a decent cut
     
  8. NCSERVICE

    NCSERVICE LawnSite Member
    Posts: 206

    Im glad it worked out for you!
     

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