Section 07 ENGINE MANAGEMENT (DI)
Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
NOTE:
This specification is of the type “indirect
measurement” relative to the piston movement
since we are measuring at a 45° angle through the
spark plug hole.
– Scribe a thin mark on PTO flywheel aligned with
timing mark pointer tool.
NOTE:
This mark becomes the reference when
using the stroboscopic timing light.
CAUTION:
The static test cannot be used as an
ignition timing setting verification, therefore,
always check the ignition timing setting with a
stroboscopic timing light.
– Remove TDC gauge.
– Reinstall spark plug and connect wire.
Dynamic Test
To check ignition timing setting, use a timing light
(available at local facilities).
NOTE:
Ensure to use a timing light capable to
work with – stroke engines.
– Connect timing light pick-up to MAG side spark
plug wire.
1
F00H1QA
TYPICAL
1. Timing light pick-up
IMPORTANT:
To check the ignition timing setting,
the spark advance curve must be locked first. This
allows to verify ignition timing setting at
any RPM
by keeping the ignition timing “frozen” so that it
does not vary with engine RPM. See IGNTION
TIMING ADJUSTMENT below for more informa-
tion.
CAUTION:
If the spark advance curve is not
locked using B.U.D.S. then a wrong ignition
timing will be seen as the ignition curve does
not match the locked ignition timing.
– Start engine and check mark
at idle speed
.
Point beam of timing light straight in line with
timing mark pointer.
NOTE:
Look at the mark at the same angle as it
was scribed so that parallax error is minimized.
F06H07A
1
1. Timing light straight in line with pointer
CAUTION:
If engine is to be run more than a
few seconds, engine must be cooled using the
flush kit.
NOTE:
If mark on PTO flywheel is perfectly
aligned with timing mark pointer, no adjustment
is required. If mark does not align with pointer,
recheck PTO flywheel mark before changing the
ignition timing setting to ensure PTO flywheel has
not loosen or tightened.
Ignition Timing Adjustment
General
To correct the ignition timing setting, the data
of the MPEM is changed using the VCK (Vehicle
Communication Kit) (P/N 295 035 981). Look in
Setting
tab of the software B.U.D.S.
NOTE:
For more information on the VCK, refer to
its online help. The MPEM programmer will not
work to perform this operation on the
DI engines
.
CAUTION:
If the ignition timing setting is ad-
justed too advanced, this will cause serious
damage to the engine.
370
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