MJM Yachts 34z Express - Manual (Page 10)

CHAPTER 3 PROPULSION SYSTEM
- 10 - 34z
3.1 GENERAL
The 34z is propelled by a diesel engine turning (via a transmission) a standard, four-blade
propeller. The single-lever control acts as a combination throttle and gear selector. Care should
be taken when shifting. Always allow the transmission to engage the new gear before throttling
up.
The engine should never be running when swimmers are near the boat.
Most of the propulsion system is accessed by tilting the bridge-deck (using the electric lifts).
3.2 COOLING
Your engine passes seawater (raw water) through a heat exchanger where it cools the engine’s
coolant. This coolant is circulated through the engine and returns to the heat exchanger. For the
engine to keep cool, it must have an adequate supply of raw water and coolant. Before starting
the engine, the raw water intake seacock should be checked, the strainer visually inspected, and
the coolant level checked. Coolant should be visible in the plastic reservoir just forward of the
engine. (If it is not, remove the filler cap and check the level there.)
Do not attempt to remove the coolant cap of a hot engine.
For details on what type of coolant to use, consult the engine operator’s manual or the
maintenance schedule included in this manual. It is recommended to check the raw water flow
after starting the engine by glancing at the exhaust outlets in the transom. Water should be
mixing with the exhaust gases and exiting the boat in noticeable surges.
RAW WATER
STRAINER
SHAFT SEAL
Note: This photo does not
show the required Zinc
retainer installed forward of
the shiny PYI collar.
HEAT EXCHANGER
Transmission cooler
AIR FILTER
FIREBOY
EXTINGUISHER