Specifications

6
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Remove inlet valve guides (4) from around the inlet valve
seats (34) on the block taking care not to damage seats.
Scrape off any gasket material (5) from the cylinder head
and block. Unscrew the discharge valve seats (6) from the
head and remove the discharge valves (7) and springs (8).
Inspect the discharge valve seats (2) for nicks, cracks, and
excessive wear and replace if necessary. The discharge valve
cap/nut stops (9) should be inspected for wear and replaced
if excessive peening has occurred. To determine if excessive
peening has occurred, measure the discharge valve travel.
Discharge valve travel must not exceed .046 inches. If
discharge valve travel is excessive, replace the cap nut/stop
assembly, discharge valve and spring.
Discard the inlet valves (3) and springs (2), the discharge
valves (7), springs (8) and the discharge valve seats (6) if
defective.
CRANKCASE BASE PLATE OR ADAPTER
Remove the cap screws securing the base plate or base
adapter. Tap with soft mallet to break the gasket seal (11).
Scrape off any gasket material from crankcase and plate or
adapter.
CONNECTING ROD ASSEMBLIES
(Note: Before removing the connecting rods, mark each
connecting rod and its cap. Each connecting rod is matched
to its own cap for proper bearing fit, and these parts must
not be interchanged.) Remove the connecting rod bolts (13)
and bearing caps (14). Push the piston (15) with the
connecting rods (16) attached out the top of the cylinders of
the cylinder block. Replace the bearing caps (14) on their
respective connecting rods. Remove the piston rings from
the pistons. If the pistons are to be removed from the
connecting rods, remove the teflon plugs (36) and press the
wrist pins (37) from the pistons and connecting rods.
If the pistons are removed from the rod, inspect the bronze
wrist pin bushing. Press out and replace the bushing if it is
excessively worn. (See inspection of parts) Discard the piston
rings (18-20) and the connecting rod journal bearings (17).
Discard the wrist pin bushings (21) if they were removed.
CYLINDER BLOCK
If the compressor is fitted with an air strainer, inlet elbow or
governor remove the same.
Remove cap screws (23) securing cylinder block to the
crankcase; separate the crankcase and cylinder block and
scrape off any gasket material.
Remove the unloader spring (34), spring saddle (35), and
spring seat (36) from the inlet cavity of the crankcase, using
long nose pliers. With the use of shop air blow the unloader
plungers (37) and guides (33) out of the cylinder block.
The inlet valve seats can be removed if worn or damaged
and are being replaced. Unloader bore bushings should be
inspected but not removed unless they are damaged. If
bushings are to be replaced, they can be removed by running
a 1/8" pipe threaded rod and pulling the bushing straight up
and out. Do not use "easy out" for removing the bushings.
CRANKCASE
Remove the key (22) or keys from the crankshaft and any
burrs on the crankshaft where the key or keys were removed.
(Note: Through Drive Compressors may have a crankshaft
key at both ends.) Remove the four cap screws (23) securing
front or drive-end end cover or flange adapter. Remove the
end cover, taking care not to damage the crankshaft oil seal
(27) or front main bearing (26), if any. Remove the O-ring
(24) from around the front end cover. Remove the four cap
screws (30) securing the rear end cover and remove the rear
end cover taking care not to damage the rear main bearing
(29), if any. Remove the O-ring (31) from around the end
cover. 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.
CLEANING OF PARTS
GENERAL
All parts should be cleaned in a good commercial grade
solvent and dried prior to inspection.
CYLINDER HEAD
Remove all the carbon deposits from the discharge cavities
and all the rust and scale from the cooling cavities of the
cylinder head body. Scrape all the foreign matter from the
body surfaces and use shop air pressure to blow the dirt
particles from all the cavities.
CYLINDER BLOCK
Clean the carbon and dirt from the inlet and unloader
passages. Use shop air pressure to blow the carbon and
dirt deposits from the unloader passages.
OIL PASSAGES
Thoroughly clean all oil passages through the crankshaft,
crankcase, end covers, and base plate or base adapter.
Inspect the passages with a wire to be sure. Blow the
loosened foreign matter out with air pressure.
INSPECTION OF PARTS
CYLINDER HEAD BODY
Inspect the cylinder head for cracks or damage. Apply shop
air pressure to one of the coolant ports with all others