Mercury 4.2 Diesel

Section 4 - Maintenance
Page 90 90-8M0113987 eng DECEMBER 2015
8. Install the propeller shaft anode and secure with the screw. Tighten the screw to the specified torque.
Bravo Three
a - Rear propeller nut
b - Rear propeller
c - Rear propeller thrust hub
d - Front propeller nut
e - Front propeller
f - Front propeller thrust hub
g - Propeller shaft anode screw
h - Flat washer
i - Star washer
j - Propeller shaft anode
Description Nm lb‑in. lb‑ft
Propeller shaft anode screw 19 168 –
Drive Belts
All drive belts must be periodically inspected for tension and condition, such as excessive wear, cracks, fraying, or glazed
surfaces.
!
WARNING
Inspecting the belts with the engine running may cause serious injury or death. Turn off the engine and remove the ignition
key before adjusting tension or inspecting belts.
2.8 shown, 4.2 similar
a - Water circulating pump pulley
b - Alternator pulley
c - Idler
d - Automatic tensioner
e - Crankshaft pulley
f - Seawater pump pulley
g - Power assisted steering pulley
h - Power assisted steering belt
i - Serpentine belt
Serpentine Belt
Inspection
1. Inspect the belt for proper tension and for the following:
• Excessive wear
• Cracks
NOTE: Minor, transverse cracks (across the belt width) may be acceptable. Longitudinal cracks (in the direction of
belt length) that join transverse cracks are not acceptable.
• Fraying
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f
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b
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d
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h
i
j
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