Specifications

1-26
GROUP I-ENGINES AND EXHAUST SYSTEMS
When new bushings are installed,
there should be a distance of 2
3
/s
inches from the inside edge of one
bushing to the inside edge of the
other bushing. The bushings should
be equally spaced within the counter-
bores.
6. After installation, ream the
bushings with a 5/16-inch reamer.
7. Lubricate the new shaft and
bushings with FoMoCo Exhaust Con-
trol Valve Solvent (COAA-19A501-
A) or a penetrating oil and graphite
mixture.
8. Insert the shaft through the
bushings and valve plate.
9. Rotate the shaft in the valve
plate until the counterweight is in the
normal "up" (heat on) position (Fig.
3).
10. Tack weld the valve to the shaft.
Move the assembly back and forth to
check for a binding condition.
11. If there is no binding, weld
the valve to the shaft in the original
manner. The shaft and valve are
stainless steel to minimize corrosion
and/or damage by excessive heat.
12. Install the thermostatic spring
in the shaft slot. Secure the spring by
crimping the shaft at the slot. Wind
the spring
3
A turn and hook the open
end of the spring over the stop pin.
The thermostatic spring should hold
the valve in the closed (heat on)
position (i.e. in the proper position
to direct the flow of gases into the
heat riser).
13. Install the stop spring.
14. Lubricate the shaft bushings
while operating the valve manually
to replace the original lubricant lost
by the welding operation. Install the
CONNECTOR
SPRING
VALVE
BODY
REMOVE SCREW
PRY UP OIL LINE WITH Pliers
A1266-A
A1468-A
FIG. 17-Regulator Valve
Assembly
FIG. 18—Oil Inlet Line Removal
manifold assemblies following the
procedure under "Manifold Installa-
tion."
POSITIVE CRANKCASE
VENTILATION SYSTEM
REMOVAL
1. Remove the crankcase ventila-
tion exhaust tube by disconnecting
the bracket from the intake manifold,
the exhaust tube from the crankcase
ventilation outlet adapter and from
the regulator valve assembly (Fig.
16).
2. Remove the regulator valve as-
sembly and the rubber connection.
3. Remove the crankcase outlet
adapter.
INSTALLATION
1. Install the crankcase outlet
adapter.
2. Position the rubber connection
and clamps on the fitting in the
intake manifold, then install the regu-
lator valve. Position the clamps.
3. Install the rubber connection
on the crankcase outlet adapter. Po-
sition and install the exhaust tube to
the regulator valve and crankcase
outlet adapter.
4. Install the bracket retaining
bolts at the intake manifold.
REGULATOR VALVE DISASSEMBLY
Place the hex of the regulator valve
body in a vise. Remove the connector,
valve, and spring (Fig. 17).
CLEANING
Clean the valve parts, exhaust
tube, and outlet adapter in clean
carburetor solvent and dry them
with compressed air. Clean the rub-
ber hose connections with a low
volatility petroleum base solvent and
dry with compressed air.
REGULATOR VALVE ASSEMBLY
Position the spring and valve in-
side the regulator valve body. Install
the regulator valve connector.
VALVE ROCKER ARM SHAFT
ASSEMBLY
REMOVAL
1. Remove the air cleaner. Re-
move the valve rocker arm cover and
discard the gasket.
2. Remove the cap screw and
bracket from the No. 4 valve rocker
arm shaft support. Pull the oil inlet
line out of the support, then pull the
line out of the block with pliers (Fig.
18). Discard the O-ring seal.
3. Remove the cap screw from the
No. 1 valve rocker arm shaft support.
Remove the oil outlet line and
bracket.
4. Loosen all the valve rocker arm
adjusting screws to remove the valve
spring load from the rocker arms.
Loosen the cap screws 2 turns at a
time in sequence. Remove the valve
rocker arm shaft assembly.
INSTALLATION
1. Apply Lubriplate to both ends
of the push rods.
2. Position the valve rocker arm
shaft assembly on the head.
3. Install the oil outlet line, brack-
et, and retaining screw on the No. 1
support. Make sure the oil line enters
the shaft locating hole.
4. Install a new O-ring seal on the
lower end of the oil inlet line. Posi-
tion the line in the No. 4 support.
Make sure the O-ring seal is in the
oil supply counterbore. Install the
bracket and support bolt.
5. Torque all the valve rocker arm
shaft retaining bolts 2 turns at a
time in sequence to specifications.
Adjust the valve clearance.
6. Clean the valve rocker arm
cover. Coat one side of a new valve
rocker arm cover gasket with oil re-
sistant sealer. Lay the cemented side
of the gasket in place in the cover.
Install the cover, making sure that
the gasket seats evenly around the
LOCK NUT
PIN
ECCENTRIC
BEARING
SPRING
SPRING ROCKER ARM
ECCENTRIC A1449-A
FIG. 19-Yalve Rocker Arm
Assembly