Inspect Acceleration Pedal Operation Inspect Ignition System z Verify Acceleration Pedal travel is smooth without sticking. Check Coolant Level z Disconnect Battery Cables. z Remove and inspect the spark plugs. Replace as required. z Test secondary cables with an Ohmmeter. If maximum resistance is higher than 25 kOhms, repair and/or replace. z Remove distributor cap and perform visual inspection. Replace cap and rotor if corrosion is found on the contacts. z The items below are a general guideline for system checks. Refer to the engine manufacturers specific recommendations for proper procedures. z Inspect the ignition coil for cracks and heat deterioration.
Visually inspect the coil heat sink fins. If any fins are broken replace as required. (1) Spark Plug Cables (2) Distributor Cap Replace Spark Plugs z Engine must be off and cold. WARNING NEVER REMOVE THE PRESSURE CAP ON A HOT ENGINE. 1 z The coolant level should be equal to the “COLD” mark on the coolant recovery tank. 2 z Add approve coolant to the specified level if the system is low. Inspect Coolant Hoses Figure 31 z Visually inspect coolant hoses and clamps. Remember to check the two coolant lines that connect to the pressure regulator/converter. z Replace any hose that shows signs of swelling, cracking, abrasion or deterioration. Inspect Battery System z Disconnect Battery Cables.
z Using a gentle twisting motion remove the high voltage cables from the spark plugs. Replace any damaged cables. z Clean battery outer surfaces with a mixture of baking soda and water. z Gap the new spark plugs to the proper specifications. Spark plug air gap : 0.7 - 0.8 mm z Remove the spark plugs. z Inspect battery outer surfaces for damage and replace as necessary. z Remove battery cable and clean, repair and/or replace as necessary. z Apply anti-seize compound to the spark plug threads and install. Spark plug tightening torque : 25 N•m (18 lb•ft) CAUTION DO NOT OVERTIGHTEN THE SPARK PLUGS. z Re-install the high voltage cables. G420E/G424E Tier LP Engine Maintenance Schedule 31