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INLET VALVES AND SEATS

Inlet valves and springs should be replaced. However, if

the inlet valve seats show signs of slight nicks or scratches,

they can be redressed with a ﬁ ne piece of emery cloth or

by lapping with a lapping stone, grinding compound and

grinding tool. If the seats are damaged to the extent that

they cannot be reclaimed, they must be replaced.

ASSEMBLY

General Note: All torques speciﬁ ed in this manual are

assembly torques and typically can be expected to fall off

after assembly is accomplished. Do not retorque after

initial assembly torques fall unless instructed otherwise.

A compiled listing of torque speciﬁ cations is presented at

the end of this manual.

To convert inch pounds of torque to foot pounds of torque,

divide inch pounds by 12.

inch pounds ÷ 12 = foot pounds

To convert foot pounds of torque to inch pounds of torque,

multiply foot pounds by 12.

foot pounds x 12 = inch pounds

INSTALLING CRANKSHAFT

Press new sleeve bearings in the end cover and crank-

case. Ensure that the slot in the bearings line up with the

oil passages in the end cover or crankcase. If you have a

model with no oil passage present in the crankcase, press

the sleeve bearing into the crankcase with the slot located

90 degrees from vertical.

Install the front thrust washer with the tang inserted in

the slot toward the ﬂ ange. Insert the crankshaft and the

rear thrust washer with the tang toward the rear of

the compressor.

Place the oil seal ring on the boss of the rear end cover and

install the end cover making sure not to pinch the seal ring.

Ensure the tang of the thrust washer is inserted in the slot

of the end cover. Fasten the end cover to the crankcase

with the four cover cap screws. Torque the cap screws to

175-225 inch pounds in a cross pattern.

PISTONS AND CONNECTING RODS

If the pistons are to be replaced ensure that the correct

pistons are being installed. Note that the pistons for the

Tu-Flo

750 compressor are similar to those of other Bendix

compressor models but may be identiﬁ ed by the piston

diameter and the distance to the center of the wrist pin from

the top of the piston as shown in Figure 13.

PISTON RINGS

Check each ring end gap in a cylinder bore before installa-

tion. Place the ring in the top of the cylinder bore and using

the piston, push the ring to the midpoint of the cylinder

bore and check the ring gap. If the end gaps are incorrect

either the wrong repair size has been purchased or the

compressor is worn beyond speciﬁ cation and should be

replaced.

PISTON COMPARISON

1.25

OTHER BENDIX

TU-FLO

AIR COMPRESSORS

FIGURE 13 - PISTON COMPARISON

Install the rings on the pistons per the following instructions

starting at the center of the piston and moving outward.

1. Install the spacer and segment rings as follows. Place

the spacer ring (25) in the piston groove, the ends of

the spacer must butt and not overlap. Install the top

segment (24) by inserting one end above the spacer

in the ring groove, 120 degrees from the spacer ends

and wind the segment into position. Install the bottom

segment in the same manner beneath the spacer,

making sure the gap is staggered 120 degrees from

both the top ring segment and the spacer end gaps.

Before using be sure both painted ends of the spacer

are visible and butted. (Refer to Figure 14.)

FIGURE 14 - PISTON & RINGS

2.78

1.06

2.17

TU-FLO

750

AIR COMPRESSOR

COMPRESSION RING (23)

SEGMENT RING (24)

SPACER RING (25)

SEGMENT RING (24)