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Kohler 48RCLB / 60RCLA — Spark Plug Service

Maintenance · Spark plugs

For the Kohler 48RCLB / 60RCLA, from the Kohler operator's manual.

Applies to: Kohler 48RCLB, Kohler 60RCLA

Before you start

  • Disconnect the battery cables before working on the generator set.
  • Do not pull on the spark plug wire; pull on the boot.
  • Do not overtighten the spark plug.

Parts for this job

  • KOH-48RCLB-SPARK Spark plug — Kohler 48RCLB buy
  • KOH-48RCLB-SPARK Spark plug — Kohler 60RCLA buy

Part numbers from the service-parts lists for Kohler 48RCLB, Kohler 60RCLA. Verify against your serial number before ordering; some links are affiliate links.

Procedure

  1. Press the OFF button on the RDC2 controller.
  2. Disconnect the power to the battery charger.
  3. Disconnect the generator set engine starting battery, negative (--) lead first.
  4. Remove spark plug wires by grasping the spark plug boot and turning slightly while pulling.
  5. Loosen the spark plug with a ratchet and 5/8-in. spark plug socket with a rubber insert.
  6. Use compressed air to remove dirt from around each spark plug.
  7. Remove spark plugs, one at a time, and examine; a light tan or gray deposit indicates good condition.
  8. Clean spark plugs by wiping them with a rag and file the center electrode.
  9. Check the spark plug gap before installing; correct gap is 0.76 mm (0.03 in.).
  10. Use a gapping tool to bend the side electrode to set the correct gap.
  11. Reinstall the spark plug, rotating clockwise until you feel resistance.
  12. Use a torque wrench to tighten each spark plug to 27 Nm (20 ft. lbs.).
  13. Check the spark plug wire connector in the boot and clean as necessary; firmly push the boot onto the plug.
  14. Reconnect the battery, negative (--) lead last, and reconnect the battery charger power.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Spark plug gap 0.76 mm (0.03 in.)
  • Spark plug torque 27 Nm (20 ft. lbs.)

Full service-parts list: Kohler 48RCLB →, Kohler 60RCLA →

Source: Kohler operator's 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.

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