Verification Or Replacement Of Spark Plugs - Rotax 912 Series Maintenance Manual

6.2)

Verification or replacement of spark plugs

CAUTION: Observe the different maintenance intervals corresponding to
Because of the differing thermal load, particular spark plugs have been specified
for each engine type.
In numerous tests the best possible heat range has been determined to make
sure that the spark plug will burn off deposits but will not overheat.
WARNING: Use of incorrect spark plugs can result in ignition problems, pre-
Ensure that the following spark plugs corresponding to engine type are em-
ployed and the correct spark plug socket is used.
Engine type
912 UL/A/F
912 ULS/S
Electrode gap:
NOTE:
- inspect all spark plugs for physical damage.
- verify the heat range and the electrode gap of the spark plugs.
CAUTION: Heat conduction at the ground electrode (1) or for head area (2)
Before every installation is the sparking plug thread and the sparking plug seat
at the zylinder head to clean (e.g. Rests of head contuction). Apply heat
conduction compound on spark plug thread and tighten spark plug to 20 Nm (177
in.lb) on the cold engine. Heat conduction compound, see Chapter 05-00-00,
para 2.5.
WARNING: Flush with water in case of contact with eyes or skin. May be
Always replace both spark plugs of a cylinder and do not interchange spark
plugs between cylinders.
Effectivity: 912 Series
MAINTENANCE MANUAL
engine type.
ignition and consequent engine damage.
Refer to Chapter 05-50-00, para 2.11.
designation
DCPR 7E
DCPR 8E
0,7 - 0,8 mm (0,0276 - 0,0315 inch)
If cold start problems are encountered, the electrode gap may be
reduced to 0,5 mm (0,0197 inch)
1
2
can lead to ignition fault.
harmful if swallowed.
AIRCRAFT ENGINES
size of socket
16 mm
16 mm
00086
12-00-00
page 38
Rev. 1, Jan. 01/2002