Engine Service Manual

19
Specifi cations
32 690 03 Rev. I KohlerEngines.com
3
Values are in Metric units. Values in parentheses are English equivalents.
7
Measure 6 mm (0.2362 in.) above bottom of piston skirt at right angles to piston pin.
CLEARANCE SPECIFICATIONS
3
KT610
KT620 KT715 KT725 KT730 KT735 KT740 KT745
Ignition
Spark Plug Gap 0.76 mm (0.030 in.)
Module Air Gap 0.203/0.305 mm (0.008/0.012 in.)
Piston, Piston Rings, and Piston Pin
Piston-to-Piston Pin Running Clearance 0.006/0.017 mm (0.0002/0.0007 in.)
Pin Bore I.D.
New
Max. Wear Limit
17.006/17.012 mm (0.6695/0.6698 in.)
17.025 mm (0.6703 in.)
Pin O.D.
New
Max. Wear Limit
16.995/17.000 mm (0.6691/0.6693 in.)
16.994 mm (0.6691 in.)
Top Compression Ring-to-Groove Side Clearance 0.030/0.070 mm (0.001/0.0026 in.)
Middle Compression Ring-to-Groove Side
Clearance
0.030/0.070 mm (0.001/0.0026 in.)
Oil Control Ring-to-Groove Side Clearance 0.060/0.190 mm (0.0022/0.0073 in.)
Top Compression Ring End Gap
New Bore
Used Bore (Max.)
Middle Compression Ring End Gap
New Bore
Used Bore (Max.)
0.189/0.277 mm (0.0074/0.0109 in.)
0.531 mm (0.0209 in.)
1.519/1.797 mm (0.0598/0.0708 in.)
2.051 mm (0.0808 in.)
Thrust Face O.D.
7
New
Max. Wear Limit
82.978 mm (3.2668 in.)
82.833 mm (3.2611 in.)
Piston Thrust Face-to-Cylinder Bore
7
Running
Clearance
New
0.019/0.062 mm (0.0007/0.0024 in.)
Valves and Valve Tappets
Clearance 0.101/0.152 mm (0.0040/0.0060 in.)
Valve Tappet to Crankcase Running Clearance 0.013/0.073 mm (0.0005/0.0029 in.)
Intake Valve Stem-to-Valve Guide Running
Clearance
0.040/0.0780 mm (0.0016/0.0031 in.)
Exhaust Valve Stem-to-Valve Guide Running
Clearance
0.052/0.090 mm (0.0020/0.0035 in.)
Intake Valve Guide I.D.
New
Max. Wear Limit
7.040/7.060 mm (0.2772/0.2780 in.)
7.140 mm (0.2811 in.)
Exhaust Valve Guide I.D.
New
Max. Wear Limit
7.040/7.060 mm (0.2772/0.2780 in.)
7.160 mm (0.2819 in.)
Valve Guide Reamer Size
Standard
0.25 mm O.S.
7.050 mm (0.2776 in.)
7.300 mm (0.2874 in.)
Intake Valve Minimum Lift 8.500 mm (0.3346 in.)
Exhaust Valve Minimum Lift 8.500 mm (0.3346 in.)
Nominal Valve Face Angle 45°