Spark Plug Not In Accordance With Specification - Rotax MML-912 Maintenance Manual

3.8)

Spark plug not in accordance with specification

If by error any of the spark plugs were installed which are not according
General note
to specification of the engine manufacturer and/or not genuine ROTAX
parts, the following verification will be necessary.
1
2
3
4
5
6
7
Effectivity: 912 Series
Edition 2 / Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Spark plug not in accordance with specification
Step
Mark position of the spark plugs (e.g. cyl. 1 top) and remove all spark
plugs.
Inspect the spark plugs for damage (formation of melt beads, burn off). At
heavy melt beads or bad burn off, inspect the piston dome and cylinder
wall by periscope. If parts are damaged, the engine must be inspected, re-
paired or overhauled in accordance with the BRP-Powertrain instructions
for continued airworthiness.
Inspect all systems for correct function.
Detailed inspection of affected engine components.
Inspect spark plug thread for damage (especially at bad burn off).
Differential pressure check. See chap. 12-20-00 section: 5).
Change oil and oil filter.
Procedure
05-50-00
page 19
October 01/2009