Kohler — Cylinder Head Removal/Installation torque
Repair & overhaul
From a Kohler service manual covering: CH18, CH20, CH22, CH23, CH25, CH620, CH630, CH640, CH670, CH680, CH730, CH740…. Check it applies to your exact model before use.
Applies to: Kohler CH18, Kohler CH740
Before you start
- Do not intermix components; cylinder heads machined differently for studs vs screws.
Procedure
- Heads secured with screws: install a new cylinder head gasket (printing up); install cylinder head and start four new screws.
- Torque screws in two stages; first to 22.6 N·m (200 in. lb.), finally to 41.8 N·m (370 in. lb.), following sequence shown.
- Heads secured with mounting studs, nuts, and washers: install new mounting studs (closest to lifters exposed height 75 mm (2 15/16 in.); furthest from lifters 69 mm (2 3/4 in.)).
- Install cylinder head; match numbers on cylinder heads and crankcase.
- Lightly lubricate exposed threads of studs with engine oil. Install flat washer and nut onto each stud. Torque nuts first to 16.9 N·m (150 in. lb.), finally to 33.9 N·m (300 in. lb.).
Specs & values
- 22.6 N·m (200 in. lb.)
- 41.8 N·m (370 in. lb.)
- 16.9 N·m (150 in. lb.)
- 33.9 N·m (300 in. lb.)
Full service-parts list: Kohler CH740 →
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.