Section 06
ENGINE MANAGEMENT (DI)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
06-03-32
SMR2002-075 _06-03A.FM
1. MAG side ignition coil at bottom
2. Mag side ignition coil wire on edge of electrical box
3. Edge of electrical box
NOTE:
If PTO ignition coil is replaced, ensure to
reinstall the white tape on the new coil on if it is
not present.
TDC SETTING
General
Before checking TDC setting with a stroboscopic
timing light (dynamic test), it is mandatory to
scribe a timing mark on the PTO flywheel (static
test) corresponding to the specific engine.
Also, the mark scribed on the PTO flywheel can
be used to troubleshoot a broken magneto woo-
druff key.
CAUTION:
The relation between the PTO flywheel
mark position and crankshaft position may
change as the PTO flywheel might move on crank-
shaft when engine is ran. This will result in a false
ignition timing reading. Always verify PTO fly-
wheel mark position before checking ignition tim-
ing with an appropriate timing light. If mark does
not align with tool, repeat static test to ensure fly-
wheel has not moved before changing the ignition
timing.
NOTE:
Do not use the factory mark found on the
PTO flywheel to check TDC setting or troubleshoot
any problems.
Normally TDC setting should not be required. It
has been set at factory and it should remain cor-
rectly set since every part is fixed and not adjust-
able. The only time the TDC setting might have to
be changed would be when replacing the crank-
shaft, the magneto rotor, the CPS, the encoder
wheel or the MPEM. If the TDC setting is found
to be incorrect, you should first check for proper
crankshaft alignment. This might be the indication
of a twisted crankshaft.
With this ignition system, the TDC setting can be
checked with either the engine hot or cold. Also,
the TDC setting is to be checked at any RPM with
the timing light. The TDC setting is best checked
at idle speed as it is more accurate and easier than
at higher speed, also it will keep the engine tem-
perature lower for a longer time. Ensure to prop-
erly cool the engine through the flushing fitting.
NOTE:
When checking the TDC setting, the spark
advance has to be locked to allow proper verifica-
tion of the TDC marks. See TDC SETTING
below.
Static Test
1. Disconnect MAG side spark plug wire and con-
nect wire to grounding device then remove spark
plug.
CAUTION:
Never crank engine with spark plugs
removed unless spark plug cables are connect-
ed to the grounding device.
2. Remove PTO flywheel guard.
3. Remove middle screw securing the engine to
the rear engine mount. Reinstall screw with tim-
ing mark pointer tool.
1. Timing mark pointer tool (P/N 295 000 135)
F12R0UB
1
3
2
1
F12R1IA
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Содержание GTX 4-TEC 5573 2002
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