Err

NGK
Products
presentation
INSTALLATION RECOMMENDATIONS
CASE OF REPLACEMENT

Some NGK spark plugs :

Spark plug NGK BR8ES 447/503/582
5.70 €
(-15.00%) 4.85 €
Spark plug NGKDCPR7E 912S 80HP
6.60 €
(-15.00%) 5.61 €
Spark plug NGKDCPR8E 912S 100HP
7.20 €
(-15.00%) 6.12 €
Spark plug NGK D9EA motor JABIRU
4.30 €
(-15.00%) 3.66 €

To find all NGK spark plug available on our website, click here

Founded in 1936, NGK or Nippon Gaishi Kaisha is a Japanese company specialized in ceramics and commercializes spark plugs.
 
Established in many countries, NGK has been the world leader in its field for years.

NGK MOUNTING RECOMMENDATIONS

ELECTRODE SPACING


It is sometimes necessary to adjust the electrode spacing because it does not always match the specific setting for each application. Gaps are specified for each application.
The adjustment of the electrodes is essential for an optimal combustion !

REPLACEMENT OF A SPARK PLUG


1. Use a suitable spark plug wrench.
2. Wait for the engine to cool before removing the
spark plug.

3. Turn the ignition cable cap slightly and remove it by pulling on the cap, not on the cable.
4. Remove the caps one at a time so that they do not get mixed up
5. Make sure the cap and ignition cable are not damaged.
are not damaged.

6. Loosen the spark plug by 1/4 turn and clean the dirt with compressed
with compressed air.

7. Remove the spark plug.
8. Clean the spark plug seat and refit a new spark plug by screwing it in
by hand without using grease on the threads. on the threads.

9. Screw in the spark plug with the recommended tightening torque
(see table opposite).

10. Replace the ignition cable, making sure the cap is properly
that the cap is properly attached.

11. For the other cylinders, repeat steps 4 à 10.
12. Check the condition of the ignition system.

TIGHTENING TORQUE (NGK data)


USE A TORQUE WRENCH

Cast iron cylinder head

Aluminium cylinder head
               
Ø 18 mm 14 mm 12 mm 10 mm 8 mm 18 mm 14 mm
N.m 35 - 40 25 - 30 15 - 25 10 - 15 - 20 - 30 10 - 25
m.kg 3,5 - 4,0 2,5 - 3,0 1,5 - 2,5 1,0 - 1,5 - 2,0 - 3,0 1,0 - 2,5
N.m 35 - 40 25 - 30 15 - 25 10 - 15  8 - 10 20 - 30 10 - 25
m.kg 3,5 - 4,0 2,5 - 3,0 1,5 - 2,5 1,0 - 1,5 0,8 - 1,0 2,0 - 3,0 1,0 - 2,5
// Ø 18 and 14 mm
1/2 - 2/3 turn
(180° à 240°)
// Ø 12 and 10 mm
1/2 turn
(180°)
// Ø 8 mm
1/3 turn
(120°)

The angles are given as an indication. Please refer to the recommended angle indicated on the candle box.

A large part of the heat is dissipated through the parting line.
Too much or too little tightening is detrimental to good heat dissipation and can lead to engine damage.

CASE OF REPLACEMENT


  SYMPTOMS
POSSIBLE CAUSES
              SOLUTIONS

Bougie usure
Used electrodes

Lack of engine power
Misfiring
Increased fuel consumption
 
  Exceeding the periodicity of
  replacement
  ▸ Replace the spark plug

Bougie encrassement sec ou humide
Dry or wet fouling

Bad ignition
 
  Air/fuel mixture too rich
  Incorrect thermal range (too cold)
  Delayed ignition
  Incorrect electrode spacing
  Oil consumption
  ▸ Adjusting the air/fuel mixture
  ▸ Checking the thermal index
  ▸ Check the ignition delay
  ▸ Check the distance between the electrodes
  ▸ Check oil consumption

Bougie fondue
Overheating

Fused, welded electrodes
 
  Incorrect thermal range
  Ignition advance
  Insufficient cooling
  Air/fuel mixture too lean
  Poorly tightened spark plug
 
  ▸ Check the spark plug recommendation
  ▸ Check the ignition advance
  ▸ Check for a cooling problem cooling
  ▸ Check the quality of the mixture
  ▸ Tighten the spark plug to the recommended torque
  with a torque wrench
 

Bougie dépôt
Deposits

Bad ignition or no ignition
 
  Poor fuel quality
  Poor oil quality
  Poor engine condition
  ▸ Check the fuel used
  ▸ Check the quality of the oil used
  ▸ Engine control

Bougie céramique cassée ou fendue
Broken or cracked ceramic

Bad ignition or no ignition
 
  Mechanical shocks
  Thermal shocks
  Engine vibrations
  Poor sealing
  Badly tightened spark plug
  ▸ Check the condition of the cylinder head gasket
  ▸ Check for vibration problems engine
  ▸ Tighten the spark plug to the recommended torque with a torque wrench

Bougie filetage cassé
Torn off thread
 
  Use of an unsuitable tool
  Too much torque applied
  ▸ Use a torque wrench
  ▸ Respect the recommended torque