Kohler CH18 User Manual

Specifi cations
1324 690 06 Rev. P KohlerEngines.com
CLEARANCE SPECIFICATIONS
4
CH18/CH20/
CH22/
CH620/CH621/
CH640/CH641
CH22/CH23/
CH620
8
/
CH640
8
/
CH670/CH680
CH25/
CH730/
CH740 CH750
Piston, Piston Rings, and Piston Pin (Style B continued)
Middle Compression Ring End Gap
New Bore 1.400/
1.679 mm
(0.0551/
0.0661 in.)
1.519/1.797 mm
(0.0598/0.0708 in.)
Used Bore (Max) 1.941 mm
(0.0764 in.)
2.051 mm (0.0808 in.)
Thrust Face O.D.
New 79.966 mm
(3.1483 in.)
10
82.978 mm (3.2668 in.)
9
Max. Wear Limit 79.821 mm
(3.1426 in.)
10
82.833 mm (3.2611 in.)
9
Piston Thrust Face-to-Cylinder Bore Running
Clearance
New
0.025/
0.068 mm
(0.0010/
0.0027 in.)
10
0.019/0.062 mm
(0.0007/0.0024 in.)
9
Valves and Valve Lifters
Hydraulic Valve Lifter to Crankcase Running Clearance 0.0241/0.0501 mm (0.0009/0.0020 in.)
Intake Valve Stem-to-Valve Guide Running Clearance 0.038/0.076 mm (0.0015/0.0030 in.)
Exhaust Valve Stem-to-Valve Guide Running Clearance 0.050/0.088 mm (0.0020/0.0035 in.)
Intake Valve Guide I.D.
New
Max. Wear Limit
7.038/7.058 mm (0.2771/0.2779 in.)
7.134 mm (0.2809 in.)
Exhaust Valve Guide I.D.
New
Max. Wear Limit
7.038/7.058 mm (0.2771/0.2779 in.)
7.159 mm (0.2819 in.)
Valve Guide Reamer Size
Standard
0.25 mm O.S
7.048 mm (0.2775 in.)
7.298 mm (0.2873 in.)
Intake Valve Minimum Lift 8.07 mm (0.3177 in.)
Exhaust Valve Minimum Lift 8.07 mm (0.3177 in.)
Nominal Valve Seat Angle 45°
4
Values are in Metric units. Values in parentheses are English equivalents.
8
CH620/CH640 engines changed from 624cc to 674cc; displacement can be confi rmed on engine nameplate.
9
Measure 6 mm (0.2362 in.) above bottom of piston skirt at right angles to piston pin.
10
Measure 13 mm (0.5118 in.) above bottom of piston skirt at right angles to piston pin.

Kohler CH18 Specifications

General

Brand	Kohler
Model	CH18
Category	Engine
Language	English