Drive Belts - D3.6L Engines - Mercury D4.2L Manual

CD651

Drive Belts - D3.6L Engines

Make sure engine is shut off and ignition key is removed before inspecting belts.
1
All drive belts must be periodically inspected for tension and condition (excessive wear, cracks, fraying, or
glazed surfaces).
A
Alternator Belt/Water Circulating Pump Belt
B
Power Steering Pump Belt
C
Vacuum Pump Belt (If so equipped)
2
Check belt tension by depressing belt, with moderate hand pressure, at points shown. Belt should depress
3/16 inch (5 mm).
ALTERNATOR BELT
Avoid water entering boat. If seawater pump hoses are to be removed with boat in the water, seacock
(if so equipped) must be closed, or water inlet hose must be disconnected and plugged to prevent
water from flowing into boat.
3
Close seacock, if so equipped, or plug seawater inlet hose.
4
Remove seawater hoses at seawater pump. Remove power steering belt.
5
Loosen mounting bolt. Loosen nut and tensioning bolt. Pivot alternator until belt can be removed.
A
Mounting bolt
B
Tensioning bolt
6
Remove old belt and install new belt. Adjust belt tension by pivoting alternator. When tension is correct, retigh-
ten all fasteners securely.
7
Reinstall and adjust tension of power steering belt.
8
Reconnect seawater hoses to seawater pump. Tighten hose clamps securely.
9
Open seacock, if so equipped, or remove plug from seawater inlet hose and reconnect hose. Tighten hose
clamps securely.
POWER STEERING PUMP BELT
10
Loosen mounting bolt. Pivot pump by loosening nut and turning tensioning bolt until belt can be removed.
A
Mounting bolt
B
Tensioning bolt
11
Remove old belt and install new belt. Pivot pump using tensioning bolt to adjust belt tension.
12
When tension is correct, retighten all fasteners securely.
VACUUM PUMP BELT
13
Remove power steering belt.
14
Loosen the vacuum pump mounting and tensioning screws, behind the bracket.
15
Appropriately pry or move the vacuum pump to loosen belt. Remove old belt.
16
Install new vacuum pump belt and adjust tension. Torque mounting and tensioning screws to 15 lb-ft (21 Nm).
WARNING
CAUTION
81