Inspection Of Parts; Crankcase Bottom Cover Or Adapter Disassembly; Connecting Rod Disassembly; Cleaning Of Parts - BENDIX TU-FLO 550 COMPRESSOR Manual

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material (5) from the cover plate, cylinder head and

crankcase.

1. Remove the unloader pistons (7), o-rings (6) and

springs (8).

2. Inspect the unloader piston bushings (9) for nicks,

wear, corrosion and scoring. It is recommended that

the compressor be replaced if it is determined that the

unloader bushing is damaged or worn excessively.

Before disassembling the discharge valve mechanism,

measure and record the discharge valve travel (from closed

to completely open).

3. If the measured discharge valve travel exceeds .046

inches, the compressor should be replaced. If the

discharge valve travel does not exceed .046, using a

9/16" Allen wrench, remove the discharge valve seats

(18), valves (17) and valve springs (16).

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

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 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.