Lexus V8 Spark Plug Inspection

Lexus V8 Spark Plug Inspection

 

SPARK PLUG INSPECTION

NOTICE:

  • Never use a wire brush for cleaning.
  • Never attempt to adjust the electrode gap on used spark plug.
  • Spark plug should be replaced every 100,000 km (60,000 miles).
  1. REMOVE NO.3 TIMING BELT COVERS.
  2. DISCONNECT HIGH-TENSION CORDS FROM SPARK PLUGS.
  3. INSPECT ELECTRODE.
    • Refer to service procedures.
Checking Plug Resistance

Checking Plug Resistance

 

  • Using a megger  (insulation resistance meter), measure the insulation resistance.

Correct insulation resistance: 10 Mega Ohms or more

  • If the resistance      is less than specified, proceed to step 4.

HINT: If a megger is not available, the following simple method of inspection provides fairly accurate results.

Simple Method:

  • Quickly race the engine to 4,000 rpm 5 times.
  • Remove the spark plug.
Plug Tip Inspection

Plug Tip Inspection

 

  • Visually check the spark plug.
  • If the electrode is dry … Okay
  • If the electrode is wet … Proceed to step 5
  • Reinstall the spark plug.

 

Removing The Spark Plugs

Removing The Spark Plugs

  1. USING A 16 MM PLUG WRENCH, REMOVE THE SPARK PLUGS.
  2. VISUALLY INSPECT SPARK PLUGS.

 

Spark Plug.png

Spark Plug.png

 

  • Check the spark plug for thread damage and insulator damage.
  • If abnormal, replace the spark plug.

Recommended spark plug:

  • ND: PK2OR8
  • NGK: BKR6EP8
  1. INSPECT ELECTRODE GAP.
Check Plug Gap

Check Plug Gap

Maximum electrode gap for used spark plug: 1.0 mm (0.039 in.)

  • If the gap is greater than maximum, replace the spark plug.

Correct electrode gap for new spark plug: 0.8 mm (0.031 in.)

NOTICE: If adjusting the gap of a new spark plug, bend only the base of the ground electrode. Do not touch the tip. Never attempt to adjust the gap on a used plug.

  1. CLEAN SPARK PLUGS.
Spark Plug Cleaner

Spark Plug Cleaner

 

  • If the electrode has traces of wet carbon, allow it to dry and then clean with a spark plug cleaner.

Air pressure: Below 588 kPa (6 kgf/cm2, 85 psi)
Duration: 20 seconds or less

HINT: If there are traces of oil, remove it with gasoline before using the spark plug cleaner.

  1. REINSTALL SPARK PLUGS.
Installing Spark Plugs

Installing Spark Plugs

  • Using a 16 mm plug wrench, install the spark plug.

Torque: 17.5 Nm (13 ft.lb)

 

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