Engine System - Petrol
97
Service Manual – Floortec R 870
Engine Spark Plug Check/Replacement
For the type of spark plug to be used, see Technical
Data chapter
Warning!
A wrong spark plug can
damage the engine.
1 Drive the machine on a level ground and engage
the parking brake
2 Turn the ignition key to “0”
3 Open the engine compartment hood with the
handle and fasten it with the support rod
4 Lift and disassemble the right side bulkhead
5 Disconnect the spark plug cap and remove dirt
around the spark plug
6 Remove the spark plug with a proper wrench
(A)
7 Check the spark plug Replace it if it is
damaged, dirty, if the sealing washer (B) is
damaged or if the electrode is worn
8 Measure the distance between the spark plug
electrodes with a feeler gauge Correct the
distance by bending carefully the side electrode
(C) The distance between the electrodes must be
of 0 70 - 0 80 mm
9
Install the spark plug manually with great care,
to avoid tightening it improperly
10
Once the spark plug is in place, tighten it with a
proper wrench to press the sealing washer
11
When a new spark plug is installed, tighten 1/2
turn once the spark plug is in place to press the
washer
12
When the original spark plug is reinstalled,
tighten 1/8 - 1/4 turn once the spark plug is in
place to press the washer
Note:
A loose spark plug can overheat
and damage the engine. Do
not overtighten, otherwise the
threads in the cylinder head
can be damaged.
13 Perform steps 4 and 3 in the reverse order
0.70 - 0.80mm
A
B
C
P200135