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5.8 SPARK PLUG
Replace every 20,000 km (12,400 mi)
Recommended type of spark plug: NGK CR8EKB
The spark plug is an essential component:
•
Proper care of the plug is important for maintaining the engine
in perfect working order.
•
For maintenance, remove the 4 screws (V - Fig. 33), widen
bottom section of the chassis, move pipe (T - Fig. 34) away
and remove cap by turning it alternately clockwise and anti-
clockwise. Now, unscrew the spark plug using the special
wrench supplied with the vehicle (all operations on the spark
plug must be performed when the engine is cold).
•
Examine the spark plug conditions after a reasonably long
drive (10-15 km) and after letting the engine cool down (at
least 10-15 minutes), since the sediments and the colour of
the insulator can provide useful information about the heat
rating of the spark plug, carburetion, lubrication and general
conditions of the engine. A light brown colour of the insulator,
around the central electrode, indicates good working order.
•
Checking and cleaning operations must be carried out every
10,000 km (6,200 mi).
•
After disassembling the spark plug, suitably clean the elec-
trodes and the insulator using a metal brush. Adjust the elec-
trode gap using a filler gauge: the gap should range from 0.7
to 0.8 mm.
english
•
Blow onto it so as to prevent possible residues from entering
the engine, then refit it, by wrenching until finger tight. Then,
using the special spark plug wrench, wrench it but not too hard.
Spark plugs with a heat rating differing from the recom-
mended one may seriously damage the engine.
It is imperative that any spark plug exhibiting cracks on
the insulator or corroded electrodes be replaced.
V
Fig. 33
Fig. 34
1
2
3
4
5
T
6
39
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