BENDIX TU-FLO 501 AIR COMPRESSOR Specifications download pdf (Page 5)

FIGURE 9- TU-FLO 501 COMPRESSOR (THRU DRIVE)

EXPLODED VIEW

new vehicles with appropriate allowances for air systems

with greater than the minimum required reservoir volume.

Air Leakage Tests

Leakage past the discharge valves can be detected by

removing the discharge line, applying shop air back through

the discharge port and listening for escaping air. Also, the

discharge valves and the unloader pistons can be checked

for leakage by building up the air system until the governor

cuts out, then stopping the engine. With the engine stopped,

listen for escaping air at the compressor intake. To pinpoint

leakage if noted, apply a small quantity of oil around the

unloader pistons. If there is no noticeable leakage at the

unloader pistons, the discharge valves may be leaking. If

the compressor does not function as described above, or

leakage is excessive, it is recommended that it be returned

to the nearest authorized Bendix Distributor for a factory

remanufactured compressor. If this is not possible, the

compressor can be repaired using genuine Bendix

replacement parts, in which case, the following information

should prove helpful.

REMOVING AND DISASSEMBLY

Removing

These instructions are general and are intended to be a

guide, in some cases additional preparations and

precautions are necessary. Chock the wheels of the vehicle

and drain the air pressure from all the reservoirs in the

system. Drain the engine cooling system and the cylinder

head of the compressor. Disconnect all air, water and oil

lines leading to and from the compressor. Remove the drive

gear(s) or pulley from the compressor crankshaft using a

gear puller. Inspect the pulley or gear and associated parts

for visible wear or damage. Since these parts are precision

fitted, they must be replaced if they are worn or damaged.

DISASSEMBLY

General

Remove road dirt and grease from the exterior of the

compressor with a cleaning solvent. Before the compressor

is disassembled, the following items should be marked to

show their relationship when the compressor is assembled.

Mark both the front and rear end cover in relation to the

crankcase. Mark the drive end of the crankshaft in relation

to the front end cover and the crankcase. Mark the cylinder

head in relation to the crankcase. Mark the base plate or

base adapter in relation to the crankcase.

A convenient method to indicate the above relationship is

to use a metal scribe to mark the parts with numbers or

lines. Do not use a marking method that can be wiped off

or obliterated during rebuilding, such as chalk. Remove all

compressor attachments such as governors, air strainers

or inlet fittings, discharge fittings and pipe plugs.

Cylinder Head

Remove the six cylinder head cap screws and tap the head

with a soft mallet to break the gasket seal. Remove the inlet

valve springs from the head and inlet valves from their guides

in the crankcase. Remove inlet valve guides from around

the inlet valve seats on the crankcase taking care not to

damage seats. Scrape off any gasket material from the

cylinder head and crankcase. Unscrew the discharge valve

seats from the head and remove the discharge valves and

springs. Inspect the discharge valve seats for nicks, cracks,

and excessive wear and replace if necessary.

The discharge valve stops 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 .057 inches. To remove the discharge valve stops,

support the machined surface of the cylinder head on an

arbor press bed and gently press the stops from the top of

the head and out the bottom. Be sure to allow sufficient

clearance for the stops between the press bed and the

bottom of the cylinder head. The valve stop bores in the

cylinder head must be inspected for excessive scoring. A

new head body must be used if scoring is excessive.

Discard the inlet valves and springs, the discharge valves

and springs and the discharge valve seats 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. Scrape

off any gasket material from crankcase and plate or adapter.

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BENDIX TU-FLO 501 AIR COMPRESSOR Specifications Page 5

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