BENDIX TU-FLO 700 COMPRESSOR Manual page 8

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.
8
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
plugged, and check for leakage by applying a soap solution
to the exterior of the body. If leakage is detected, replace
the head.
END COVERS
Check for cracks and external damage. If the crankshaft
main bearings are installed in the end cover, check for
excessive wear and flat spots and replace them if necessary.
If the compressor has an oil seal in the end cover, it should
be removed by pressing it out of the end cover.
CRANKCASE
Check all crankcase surfaces for cracks and damage. On
compressors where ball bearing main bearings are used the
difference between the O.D. of the outer race and the I.D. Of
the crankcase hole should be .0000 in. to .0015 in. loose.
This is to maintain the correct press fit. The crankcase must
be replaced if the fit is too loose.
On compressors fitted with precision, sleeve main bearings,
the difference between the O.D. of the crankshaft journal
and the main bearing I.D. must not exceed .0065 in. If the
clearance is greater than .0065 in., the end cover or main
bearing must be replaced.
CYLINDER BLOCK
Check the unloader bore bushings to be sure they are not
worn, rusted, or damaged. If these bushings are to be
replaced, they can be removed by running a 1/8 in. pipe
thread tap into the bushing, and inserting a 1/8 in. pipe
threaded rod and pulling the bushing straight up and out. Do
not use an easy-out for removing these bushings. If the inlet
valve seats are worn or damaged, so they cannot be
reclaimed by facing, they should be replaced. Cylinder bores
should be checked with inside micrometers or calipers (see
Figure 9). Cylinder bores which are scored or out of round
by more than .001 in. or tapered more than .002 in. should