Bendix Commercial Vehicle Systems BX2150 AIR COMP - Manual (Page 10)

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6. Remove the drive gear(s) or pulley from the compressor
crankshaft using a gear puller. Inspect the pulley or
gear and associated parts for visible wear or damage.
Since these parts are precision fitted, they must be
replaced if they are worn or damaged.
PREPARATION FOR DISASSEMBLY
Remove road dirt and grease from the exterior of the
compressor with a cleaning solvent. Before the compressor
is disassembled, the following items should be marked to
show their relationship when the compressor is assembled.
Mark the rear end cover in relation to the crankcase. Mark
the cylinder head in relation to the crankcase. Mark the
base plate or base adapter in relation to the crankcase.
A convenient method to indicate the above relationship is to
use a metal scribe to mark the parts with numbers or lines.
Do not use a marking method that can be wiped off or
obliterated during rebuilding, such as chalk. Remove all
compressor attachments which have not been previously
specified.
CYLINDER HEAD DISASSEMBLY
Remove the four cylinder head cap screws and tap the head
with a soft mallet to break the gasket seal. Scrape off any
gasket material from the cylinder head and crankcase.
Before disassembling the discharge valve mechanism,
measure and record the discharge valve travel (from closed
to completely open).
1. If the measured discharge valve travel DOES NOT
EXCEED .032 inches, the discharge valve stop need
not be removed. It is recommended that the cylinder
head body be replaced if the discharge valve stop requires
replacement. In the event this is not possible the following
procedure can be followed: Using a 9/16” Allen wrench,
remove the discharge valve seat, valve, and valve spring.
To remove the discharge valve stop, support the machined
surface of the cylinder head on an arbor press bed and
gently press the stop from the top of the head and out
the bottom. Be sure to allow sufficient clearance for the
stop between the press bed and the bottom of the
cylinder head. The valve stop bore in the cylinder head
must be inspected for excessive scoring. A new cylinder
head body must be used if scoring is excessive.
2. Remove the unloader stop and o-ring.
3. Remove the unloader piston and o-ring.
4. Insert the lugs of a spanner wrench into the holes of the
inlet valve stop and remove the inlet valve stop along
with the inlet valve, valve seat, unloader gasket and
spring. (NOTE: Reference Williams adjustable face
spanner #483.)
5. Inspect the unloader piston bushing for nicks, wear,
corrosion and scoring. It is recommended that the
cylinder head body be replaced if it is determined that
the unloader piston bushing requires replacement. If
this is not possible, the bushing can be pressed out of
the head using the same procedure presented in Step
2 of this disassembly section. NOTE: if the bushing is
pressed out and the cylinder head casting is damaged
in the process, cylinder head repair is not recommended
Pressing in the replacement bushing will result in air or
water leakage.
CRANKCASE BASE PLATE OR ADAPTER
DISASSEMBLY
1. Remove the cap screws securing the base plate or base
adapter. Tap with soft mallet to break the gasket seal.
Scrape off any gasket material from crankcase and
plate adapter.
CONNECTING ROD DISASSEMBLY
Before removing the connecting rod, mark the connecting
rod and its cap. The connecting rod is matched to its own
cap for proper fit, and the cap must be reinstalled in the
same position on the rod.
1. Straighten the prongs of the connecting rod bolt locks
and remove the bolts and bearing cap.
2. Push the piston with the connecting rod attached out
the top of the cylinder of the crankcase. Replace the
bearing cap on the connecting rod.
3. Remove the piston rings from the piston. If the piston is
to be removed from the connecting rod, remove the
wrist pin teflon plugs and press the wrist pin from the
piston and connecting rod.
4. If the piston is removed from the rod, inspect the wrist
pin bore or the bronze wrist pin bushing in the connecting
rod. If excessive wear is noted or suspected, replace
the connecting rod.
COMPRESSOR CRANKCASE DISASSEMBLY
1. Remove the key or keys from the crankshaft and any
burrs from the crankshaft where the key or keys were
removed. (NOTE: Through drive compressors may have
a crankshaft key at both ends.)
2. Remove the four cap screws and lockwashers or nuts
and lockwashers that secure the rear end cover to the
crankcase.
3. Remove the rear end cover, thrust bearing and end
cover o-ring taking care not to damage the bearing if
present in the end cover.
4. If the compressor has ball type main bearings, press
the crankshaft and ball bearings from the crankcase,
then press the ball bearings from the crankshaft.
5. Press the oil seal out of the compressor crankcase if
so equipped.