BENDIX TU-FLO 700 COMPRESSOR Manual page 10

REPAIRS
DISCHARGE VALVES, VALVE STOPS AND
SEATS
If the discharge valve seats merely show signs of slight wear,
they can be dressed by using a lapping stone, grinding
compound and grinding tool. Install the new discharge valve
springs and valves. Screw in the discharge valve seats.
Discharge valve travel should be between .030 in. to .046 in.
To test for leakage by the discharge valves, apply 100 pounds
of air pressure through the cylinder head discharge port and
apply a soap solution to the discharge valves and seats. A
slight leakage in the form of soap bubbles is permissible. If
excessive leakage is found, leave the air pressure applied
and with the use of a fiber or hardwood dowel and a hammer,
tap the discharge valves off their seats several times. This
will help the valves to seat and should reduce the leakage.
With the air pressure still applied at the discharge port of
the cylinder head, check for leakage around the discharge
valve cap nut on the top of the cylinder head casting. No
leakage is permitted.
INLET VALVES AND SEATS
Inlet valves and springs should be replaced, if the inlet valve
seats show signs of slight nicks or scratches. They can be
redressed with a fine 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. The dimension from the
top of the cylinder block to the inlet valve seat should not
exceed .113 in. nor be less than .101 in.
8
7
6
DISCHARGE VALVE,
VALVE STOP
AND SEAT
FIGURE 11
10
2
3
4
10
INLET VALVE
AND SEAT
FIGURE 12
ASSEMBLY
General Note: All torques specified in this manual are
assembly torques and can be expected to fall off after
assembly is accomplished. Do not retorque after initial
assembly torques fall.
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 THE CRANKSHAFT
Press new sleeve bearings in the end cover and crankcase.
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 flange. 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. Note: For cast iron
flange adapters, torque the four 7/16 in. cap screws to 38-
45 foot pounds. For die cast aluminum end covers, torque
the four 7/16 in. cap screws to 25-30 foot pounds. All end
covers using 5/16 in. cap screws or stud and nuts are torqued
to 15-18 foot pounds. For through drive compressors with a
cast iron end cover, torque the four 7/16 in. cap screws to
25-30 foot pounds.
PISTONS AND CONNECTING RODS
If new wrist pin bushings are to be used, they should be
pressed into the connecting rods so that the oil hole in the
bushing lines up with the one in the rod. The new bushings
should then be reamed or honed to provide between .0001
in. (.00254 mm) and .0006 in. (.01524 mm) clearance on
the wrist pin. Position the connecting rod in the piston and
press in the wrist pin.
Pistons installed in compressors manufactured prior to
November, 1976, will have the wrist pin secured in the piston
by a lock wire extending through matching holes in wrist pin
and piston boss, anchored in a hole in the side wall of the
piston. If the original pistons are used the wrist pin must be
pressed in so the hole in the wrist pin aligns with that of the