Inspection Of Parts; Connecting Rod Disassembly; Compressor Crankcase Disassembly; Crankcase - BENDIX TU-FLO 750 COMPRESSOR Manual

4. Remove the inlet valve stops (14), valves (17), valve seats
(11), valve springs (12) and gaskets (10). It is recom-
mended that a tool such as a J-25447-B, produced by
Kent Moore Tool Division Roseville, Michigan phone
1-800-328-6657, be used to remove the inlet valve stop.
CRANKCASE BOTTOM COVER OR ADAPTER
DISASSEMBLY
1. Remove the cap screws (22) securing the bottom cover
or adapter (21). Tap with a soft mallet to break the gas-
ket seal. Scrape off any gasket material (20) from the
crankcase and bottom cover or adapter.

CONNECTING ROD DISASSEMBLY

Before removing the connecting rod, mark the connecting
rods (37) and their caps (39) to ensure correct reassembly.
The connecting rod and cap are a matched set therefore the
caps must not be switched or rotated end for end.
1. Remove the connecting rod bolts (40) and bearing caps
(39).
2. Push the pistons (26) with the connecting rods (37) at-
tached out the top of the cylinder bore of the crankcase.
Replace the bearing caps on the connecting rods.
3. Remove the piston rings (23-25) from the piston. If the
piston is to be removed from the connecting rod, remove
the wrist pin teflon plugs (28) and press the wrist pin
(27) from the piston and connecting rod.
4. If the piston is removed from the rod, inspect the wrist
pin bore in the piston and bronze wrist pin bushing (36)
in the connecting rod. If excessive wear is noted or sus-
pected, replace the connecting rod and piston.

COMPRESSOR CRANKCASE DISASSEMBLY

1. Remove the key or keys (30) from the crankshaft (29)
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 (35) and lockwashers or
nuts and lockwashers that secure the rear end cover
(34) to the crankcase.
3. Remove the rear end cover (34), thrust washer (31) and
end cover oil seal ring (33), 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 (29) and ball bearings from the crank-
case, then press the ball bearings from the crankshaft.
5. Press the oil seal out of the compressor crankcase, if
so equipped.
CLEANING OF PARTS GENERAL
All parts should be cleaned in a good commercial grade of
solvent and dried prior to inspection.
CYLINDER HEAD
Remove carbon deposits from the discharge cavity and rust
and scale from the cooling cavities of the cylinder head body.
Scrape all foreign matter from the body surfaces and use
shop air pressure to blow the dirt particles from the cavities.
Clean carbon and dirt from the inlet and unloader passages.
Use shop air to blow the carbon and dirt deposits from the
unloader passages.
OIL PASSAGES
Thoroughly clean all oil passages through the crankshaft,
crankcase, end covers, 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. With the
cylinder head and head gasket secured to a flat surface or
crankcase, apply shop air pressure to one of the coolant
ports with all others plugged, and check for leakage by ap-
plying a soap solution to the exterior of the body. If leakage
is detected, replace the compressor.
END COVERS
Check for cracks and external damage. If the crankshaft
main bearing (32) is installed in the end cover (34), check
for excessive wear and flat spots and replace if necessary.

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 .0003 in. tight to .0023 in.
loose. This is to maintain the correct fit. The compressor
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 l.D. must not exceed .005 in. If the
clearance is greater than .005 in. the bearing must be re-
placed.
The cylinder bores should be checked with inside microme-
ters or calipers. Cylinder bores which are scored or out of
round by more than .0005 in. or tapered more than .0005 in.
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