Ignition Coil - Mercury 15 EFI FourStroke Service Manual

Timing Belt Installation
1. Ensure that the timing marks on the crankshaft drive gear and the camshaft driven gear are still aligned with the
corresponding marks on the engine.
Timing marks (shown with starter bracket removed, for clarity)
a - Crankshaft drive gear timing mark
b - Timing mark on the cylinder block for the crankshaft
c - Timing mark on the cylinder block for the camshaft
d - Timing mark for #1 cylinder
e - Timing mark for #2 cylinder
2. Install the timing belt.
3.
Install the stator. Refer to Stator Installation.
4.
Install the flywheel. Refer to Flywheel Installation.
5. Install the camshaft gear cover. Refer to Section 3C ‑ Camshaft Gear Cover/Vent Tank.
6. Install the air box and recoil starter assembly.
• It is easiest to install the recoil starter and air box together.
• Refer to Section 8A ‑ Recoil Starter and Section 3C ‑ Air Box Installation.

Ignition Coil

The primary side of the ignition coil receives voltage discharged from a capacitor located inside the ECM. The voltage is
multiplied significantly by the coil so it can jump the spark plug gap while under compression. The ignition coil will produce a
high voltage spark every revolution of the flywheel. The spark timing curve is controlled by the ECM.
Ignition Coil Testing
NOTE: The readings listed were taken at 20 °C (68 °F) with a digital ohmmeter. Due to the number of different manufacturers,
meters available, and temperature variance; test results may vary.
It is not necessary to remove the ignition coil from the powerhead for testing.
90-8M0125265 eng NOVEMBER 2017
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b
c
d
© 2018 Mercury Marine
Ignition
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