Engine Cooling System; Shaft-Transmission Alignment - Maxum 3700 SCR Supplemental Owner's Manual

Engine Cooling System

• The engine cooling system circulates raw
water around components and also uses a
heat exhanger to reduce engine temperature.
• Engine coolant (antifreeze) levels should be
checked at the engine-mounted expansion
tanks and at the coolant recovery bottles,
located near the engines.
! CAUTION!
SCALDING HAZARD!
Never check coolant levels when the engine
is hot or while the engine is operating.
• Make sure both engine seawater intake
valves (seacocks) are open before starting
the engines and keep the seacocks open
while the engines are running.
! CAUTION!
SYSTEM DAMAGE HAZARD!
The engine cooling system's seacocks must
be opened before engines are started and
remain open during engine operation.
• The engine cooling system's seawater strainers (located in the forward bilge) should be checked for leaks and
cleaned every time you use your yacht. For instructions on how to clean the seawater strainers, see the Seawater
Strainer section of this supplement.

Shaft-Transmission Alignment

• Alignment between the engine transmis-
sion output shaft and the propeller shaft is
critical. This alignment has been per-
formed at the factory, and was rechecked
by the dealer after the boat had been in the
water for 48 hours.
• An alignment inspection should be per-
formed as part of the routine maintenance
program (after the initial 30 hours of oper-
ation, then every 60 hours) and whenever
an unusual noise or vibration is noticed.
• To insure proper alignment after a haulout
or dry storage, wait 48 hours after launch-
ing before making final alignment adjust-
ments.
SYSTEM DAMAGE HAZARD! If a shaft misalignment exists, have a qualified marine
mechanic perform an alignment as soon as possible. Continued use may lead to premature
engine, transmission, shaft, shaft seal and/or hull damage!
TYPICAL ENGINE COOLING SYSTEM ROUTING
TYPICAL VIEW OF ENGINE SEAWATER INTAKE VALVE
SEACOCK
SECTION
TYPICAL TRANSMISSION-TO-PROP SHAFT COMPONENTS
TRANSMISSION-TO-PROP SHAFT COMPONENTS VARY,
DEPENDING UPON ENGINE TYPE AND SIZE
CLAMPS
SECTION VIEW
OF HULL
SHAFT LOG
(TRIANGLE FLANGE)
CAUTION
!
37OO SCR Sport Yacht
Chapter 2: Components/Systems
SEAWATER
CONNECTS TO
STRAINERS
RAW WATER PUMP
INLET ON ENGINES
SEACOCK
SEACOCK GASKET
LEVER
HULL
INTAKE STRAINER
CARBON/GRAPHITE
FLANGE
COUPLER
ROTOR
SHAFT
BELLOWS
FLANGE BOLT (TYPICAL)
POSSIBLE QUANTITY:
CLAMPS
•
Owner's Manual Supplement
15
TRANSMISSION
OUTPUT FLANGE
4, 6 OR 8 BOLTS