Bendix Commercial Vehicle Systems BX2150 AIR COMP (BW1424) - Manual (Page 5)

5
The cylinder bore, connecting rod wrist pin bushing and ball
type main bearing, where used, are splash lubricated. Splash
lubrication is obtained as oil is forced out around the
crankshaft journals by engine oil pressure. See the tabulated
technical data in the back of this manual for specific
requirements.
COOLING
Air flowing through the engine compartment from the action
of the engine’s fan and the movement of the vehicle assists
in cooling the crankcase. Coolant flowing from the engine’s
cooling system through connecting lines enters the head
and passes through the head’s water jacket and back to the
engine. Proper cooling is important in maintaining discharge
air temperatures below the maximum 400°F recommended.
Figure 5 illustrates the various approved coolant flow
directions. See the tabulated technical data in the back of
this manual for specific requirements.
INLET CHECK VALVE
An inlet check valve is used on some naturally aspirated
BX-2150
™ compressors (never with pressurized induction,
see #3 above) to prevent inlet oil misting during the unloaded
cycle.
The new style BX-2150 ™ compressor head (See Figure 6)
can be identified by the plugged boss on the upper right
hand side. This head only requires kit 104670 to install an
inlet check valve. All other old style BX-2150
™ compressor
heads (See Figure 6) require the use of the inlet adapter
297871 and inlet gasket 243430 in addition to the kit 104670.
WARNING!
FAILURE TO INSTALL ADAPTER 297871 WHEN
REQUIRED WILL RESULT IN COMPRESSOR DAMAGE.
The inlet check valve consists of three parts, the inlet gasket,
the inlet check valve reed and the inlet check valve seat
(See Figure 6) during the compression cycle, the inlet check
valve reed is drawn away from its seat uncovering three inlet
holes which allows air to flow into the compressor inlet cavity.
A machined stop in the cylinder head inlet cavity or in the
inlet adapter 297871 limits the travel of the inlet check valve
reed. In the unloaded cycle, the inlet check valve reed rests
on its seat covering the three inlet holes. Air from within the
compressor is prevented from exiting the inlet cavity.
FIGURE 5 - WATER CONNECTIONS/FLOW
I N
PLUG
OUT
I N
PLUG
OUT PLUG
I N
OUT
FIGURE 6
ADAPTER REQUIRED
OLD STYLE HEAD
ADAPTER NOT REQUIRED
NEW STYLE HEAD
FAILURE TO INSTALL ADAPTER 297871
WHEN USING AN INLET CHECK VALVE
WITH THIS STYLE HEAD... WILL
RESULT IN COMPRESSOR DAMAGE
INLET CHECK
VALVE KIT 104670
INLET ADAPTER 297871
GASKET 243430
IDENTIFY NEW HEAD BY NOTING
PRESENCE OF PLUGGED BOSS
HERE
INLET CHECK VALVE KIT 104670
AIR INDUCTION
GENERAL
There are three methods of providing clean air to the BX-2150 ™
compressor;
1. Naturally aspirated Local Air Strainer - Compressor
utilizes its own attached air strainer (polyurethane sponge
or pleated paper dry element).
2. Naturally aspirated Engine Air Cleaner - Compressor inlet
is connected to the engine air cleaner or the vacuum
side (engine air cleaner) of the supercharger or
turbocharger.
3. Pressurized induction - Compressor inlet is connected
to the pressure side of the supercharger or turbocharger.
See the tabulated technical data in the back of this manual
for specific requirements for numbers 2 and 3 above.