Kohler — Spark Plug Service
Maintenance · Ignition system
From a Kohler service manual covering: 10C, 10CC, 10CFC, 10CFZ, 12C, 12CFC, 12CFZ, 40CZ, CZ/12-Lead. Check it applies to your exact model before use.
Applies to: Kohler 10C, Kohler 12C, Ford VSG-411 (10 kW) / VSG-413 (12 kW) engine
Before you start
- Do not overtighten spark plugs.
Procedure
- Clean area around spark plug with compressed air.
- Remove spark plug cap and spark plug.
- Inspect plug; replace if insulation cracked or damaged.
- Measure gap with feeler gauge.
- Adjust gap to 0.039 in. (1.0 mm).
- Thread plug by hand until snug.
- Tighten to 11-15 ft lbs (15-20 Nm).
- Replace spark plug cap.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark plug Motorcraft AGSF-22C
- Gap 0.039 in. (1.0 mm)
- Torque 11-15 KuduParts $20.00 FridayParts $20.30 ft lbs (15-20 Amazon eBay FridayParts $130.18 Nm)
Full service-parts list: Kohler 12C →
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.