1-1
SECTION 1
DESCRIPTION
1.1 INTRODUCTION
This manual contains Operating Data, Electrical Data
and Service instructions for the DM-4 Power Pack.
WARNING
Beware of V-belts and drive components as the
unit may be started remotely. Make sure the
control switch is in the OFF position.
The unit is a one piece, self contained, pre-wired
diesel powered compressor/alternator drive unit. When
connected to a specific evaporator - condenser section it
will form a complete self powered bus air-conditioning
system.
The unit consists of an engine compressor assembly,
belt driven heavy duty alternator, radiator and fan
assembly, electrical control panel and associated
components.
The compressor is equipped with unloaders as
standard equipment. Unloaders are used as a compressor
capacity control to unload the compressor during periods
of reduced loads. This provides closer temperature
control, and reduces power required to operate the
compressor, thus reducing fuel consumption.
The engine gives excellent fuel economy and has easy
starting characteristics. The engine is equipped with
spin-on lube oil and fuel filters for easier filter changes.
NOTE
Throughout this manual, whenever the “left” or
“right” hand side of the engine is referred to, it is
the side as viewed from the flywheel end of the
engine.
The diesel engine drives the compressor directly
through a nylon drive gear and adapter. The adapter also
includes a V-belt sheave which drives the system
alternator.
Electrical power for the control system and for starting
the engine is provided by the bus 12-volt batteries. The
unit may be started from the main control panel located on
the Power Pack frame or from the driver’s control panel.
As a safety precaution the driver’s start switch is rendered
inoperative whenever the unit switch on the main panel is
in the OFF position.
1.2 ENGINE DATA
Engine Model:
CT-134TV
Displacement:
2.2liters (134 in
3
)
No. of cylinders:
4
Horsepower:
34 @ 1900rpm
25 @ 1350rpm
Coolant capacity:
7.6 liters (2-1/2 gal.)
Oil capacity w/filter:
14 liters (15 qts.)
Operating speeds:
High-1900 rpm
Low-1350 rpm
Injector setting:
140-150 km/cm
2
)
Fuel type:
Diesel #1 or #2
Firing order:
1-3-4-2
Glow plug amperage:
7.0 amps/plug
Valve clearance cold:
0.0071 to 0.0087
1.3 ENGINE SCREW THREADS
All threads used on the diesel engine are metric.
1.4 LUBRICATION SYSTEM
Oil pressure: 40-60 psig (Engine in high speed)
Oil pressure safety switch: Opens @10(
3)psig
Lube Oil Viscosity: 30W or 15W40
Oil change interval: First 400 Hours, thereafter as
listed below.
CAUTION
The maximum oil change interval is 1 year (for
either approved oil) The only approved synthetic
oil is Mobil Delvac 1. The normal oil change
intervals (listed below) should be reduced if the
engine is operated under extreme conditions
such as in dirty environments.
Oil Type:
API Class CD Mobil Delvac1
Change Interval: 1500 hrs.
3000 hrs.
