Kohler CH5 / CH6 — Cylinder Head Installation and Valve Adjustment
Repair & overhaul
For the Kohler CH5 / CH6, from the Kohler service manual.
Applies to: Kohler CH6
Before you start
- Always use new gaskets.
Procedure
- Install new cylinder head gasket.
- Install cylinder head and tighten hex flange screws in several increments to 22.6 Nm (200 in. lb.) in sequence shown.
- Set spark plug gap at 1.02 mm (0.040 in.). Install spark plug and torque to 24.4—29.8 Nm (18—22 ft. lb.).
- Install push rods. Check seated on tappets and rocker arms.
- Position crankshaft so piston is at top of compression stroke.
- Insert flat feeler gauge between rocker arm and valve stem. Clearance should be 0.038—0.051 mm (0.0015—0.0020 in.) for both intake and exhaust.
- Adjust by turning adjusting nut clockwise to decrease clearance, counterclockwise to increase.
- Install new valve cover gasket. Install breather assembly.
- Install valve cover. Torque hex flange screws to 3.4 Nm (30 in. lb.) in sequence shown.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Cylinder head fastener torque: 22.6 Nm (200 in. lb.)
- Spark plug torque: 24.4—29.8 Nm (18—22 ft. lb.)
- Valve-to-rocker arm clearance: 0.038—0.051 mm (0.0015—0.0020 in.)
- Valve cover fastener torque: 3.4 Nm (30 in. lb.)
Full service-parts list: Kohler CH6 →
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.