BENDIX TU-FLO 750 COMPRESSOR Service Data - Page 9

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4. Remove the inlet valve stops (14), valves (17), valve

seats (11), valve springs (12) and gaskets (10). It is

recommended 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

gasket 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)

attached out the top of the cylinder bore of the crank-

case. 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 teﬂ on 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 suspected, 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 crankcase,

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 ﬂ at surface

or crankcase, apply shop air pressure to one of the cool-

ant 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 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 ﬂ at 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 ﬁ t. The compressor

must be replaced if the ﬁ t is too loose.

On compressors ﬁ tted 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

replaced.

The cylinder bores should be checked with inside microm-

eters or calipers. Cylinder bores which are scored or out of

round by more than .0005 in. or tapered more than .0005