Rear Seal Installation - Mercury MerCruiser Service Manual

Engine Inspection and Assembly
IMPORTANT: The crankshaft position sensor must be fully seated in the front cover. Erratic engine operation can occur if
sensor is not properly installed.
Tube Ref No.
Mercury 25W-40
Synthetic Blend 4-Stroke
139
Engine Oil
4. Install the crankshaft position sensor. Ensure that the sensor is fully seated in the cover.
b
a
5. Install the crankshaft position sensor screw. Tighten the screw to the specified torque.
Description
Crankshaft position sensor screw
IMPORTANT: Use Loctite 598 RTV Sealant to the keyway of the harmonic damper to prevent oil migration past the key.
6. Install the crankshaft harmonic damper. Tighten the screw to the specified torque.
Tube Ref No.
Loctite 598 RTV Sealant
142
Description
Crankshaft harmonic damper screw
7. Install the water circulating pump. Tighten the screws to the specified torque.
Description
Water circulating pump screws
8. Install the hoses to the water circulating pump.
9. Install the crankshaft pulley. Tighten the screw to the specified torque.
Description
Crankshaft pulley screws

Rear Seal Installation

1. Remove the installation guide from the new crankshaft rear oil seal.
Page 3B-38
Description
a - Screw
c
b - Crankshaft position sensor
c - Crankcase front cover
30312
Description
© 2016 Mercury Marine
Where Used
Crankshaft position sensor O-ring seal
Where Used
Keyway of the harmonic damper
90-8M0099748 eng DECEMBER 2015
Part No.
92-8M0078629
Nm lb‑in.
8 70.8
Part No.
Obtain Locally
Nm lb‑in.
102 – 75.2
Nm lb‑in.
29 – 21.4
Nm lb‑in.
27 –
lb‑ft
–
lb‑ft
lb‑ft
lb‑ft
20