Powerhead Installation - Mercury 15 EFI FourStroke Service Manual

12. Electric start models: Connect the engine harness red bullet connector to the voltage regulator/rectifier.
f
Description
Ground terminal screw
Oil pressure switch screw
13. Install the ignition coil. Refer to Section 2A ‑ Ignition Coil. Be certain to tighten the mounting screws to the specified
torque.
Description
Ignition coil mounting screw (M6 x 25) (2)
14. Connect the throttle position sensor (TPS), temperature and manifold absolute pressure (TMAP) sensor, and the idle air
control (IAC) to the engine harness.
IMPORTANT: Additional connections will be made after the powerhead is installed onto the driveshaft housing. Secure all loose
items as necessary, for the powerhead installation.

Powerhead Installation

IMPORTANT: This procedure assumes that all components are in the state as removed in Powerhead Removal (for example,
the VST and fuel rail remain connected by the high‑pressure fuel hose). If any additional disassembly was performed, refer to
the appropriate service procedure for reassembly details.
This procedure contains steps for an electric start, power tilt model. Some steps will not apply to other models.
1. Attach the powerhead to the driveshaft housing:
a. Ensure that the powerhead gasket, driveshaft seal, and rubber seal are in place on the driveshaft housing. Refer to
Section 5A ‑ Driveshaft Housing Installation for details.
b. Install the powerhead onto the driveshaft and driveshaft housing.
90-8M0125265 eng NOVEMBER 2017
a
b
e
d
a
b
c
a - 2‑pin ECT sensor connector
b - Voltage regulator/rectifier red bullet
connector
c - Yellow fuse housing
d - Oil pressure switch with rubber boot
installed (behind harness)
e - Ground terminal
f - Black fuse housing
63939
c
a -
b -
c -
63938
© 2018 Mercury Marine
Cylinder Block/Crankcase
Nm lb‑in.
6.0 53.1
1.5 13.3
Nm lb‑in.
6.0 53.1
TPS connector
TMAP sensor connector
IAC connector
Page 4A-33
lb‑ft
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lb‑ft
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