49
CB808
Changing Drive Unit Oil
50132
4
70568
6
70570
5
72522
1
77630
1 Remove gear lube monitor bottle from bracket.
2 Empty contents into suitable container.
3 Install monitor in bracket.
4 Bravo One Models: Remove propeller, place drive unit in full trim limit IN position, remove OIL FILL/DRAIN
SCREW and sealing washer and drain oil.
5 All Other Models: Place drive unit in full trim limit OUT position, remove OIL FILL/DRAIN SCREW and
sealing washer and drain oil.
6 Remove OIL VENT screw and sealing washer. Allow oil to drain completely.
IMPORTANT: If any water drained from OIL FILL/DRAIN hole, or if oil appears milky, drive unit is leaking
and should be checked immediately by your Authorized Mercury MerCruiser Dealer.
7 Lower drive unit so propeller shaft is level. Fill drive unit, through OIL FILL/DRAIN hole, with specified gear
lube until an air-free stream of lubricant flows from OIL VENT hole.
IMPORTANT: Use only Quicksilver High Performance Gear Lube in drive unit.
8 Install OIL VENT screw and sealing washer.
9 Continue to pump gear lube into the gear lube monitor circuit until gear lube appears in the gear lube monitor.
10 Fill monitor to FILL mark. Lubricate O-ring on neck with gear lube. Install cap; DO NOT overtighten.
11 Remove pump from OIL FILL/DRAIN hole. Quickly install sealing washer and OIL FILL/DRAIN screw.
Tighten securely.
12 Bravo One: Grease propeller shaft heavily, with specified lubricant (Refer to Propeller Installation). Reinstall
propeller and torque nut to 55 lb-ft (75 Nm) minimum.
13 Recheck oil level after first use.
IMPORTANT: Oil level in gear lube monitor will rise and fall during drive operation; always check oil level
when drive is cool and engine is shut down.
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