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. Description Where Used Part No.
139
Mercury 25W-40
Synthetic Blend 4-Stroke
Engine Oil
Crankshaft position sensor O-ring seal 92-8M0078629
4. Install the crankshaft position sensor. Ensure that the sensor is fully seated in the cover.
a - Screw
b - Crankshaft position sensor
c - Crankcase front cover
5. Install the crankshaft position sensor screw. Tighten the screw to the specified torque.
Description
Nm lb‑in. lb‑ft
Crankshaft position sensor screw 8 70.8 –
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.
Description Where Used Part No.
142
Loctite 598 RTV Sealant Keyway of the harmonic damper Obtain Locally
Description Nm lb‑in. lb‑ft
Crankshaft harmonic damper screw 102 – 75.2
7. Install the water circulating pump. Tighten the screws to the specified torque.
Description
Nm lb‑in. lb‑ft
Water circulating pump screws 29 – 21.4
8. Install the hoses to the water circulating pump.
9. Install the crankshaft pulley. Tighten the screw to the specified torque.
Description
Nm lb‑in. lb‑ft
Crankshaft pulley screws 27 – 20
Rear Seal Installation
1. Remove the installation guide from the new crankshaft rear oil seal.
Engine Inspection and Assembly
Page 3B-38 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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