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305-350 ENGINE
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6A6-3
When raising or supporting the engine for any reason,
do not use a jack under the oil pan or crankshaft pulley. Due
to the small clearance between the oil pan and the oil pump
screen, jacking against the oil pan may cause it to be bent
against the pump screen, resulting in a damaged oil pick-up
unit.
It should be kept in mind, while working on the engine,
that the 12-volt electrical system is capable of violent and
damaging short circuits. When performing any work where
electrical terminals could possibly be grounded, the ground
cable of the battery should be disconnected at the battery.
Any time the carburetor or air cleaner is removed, the
intake opening should be covered. This will protect against
accidental entrance of foreign material which could follow
the intake passage into the cylinder and cause extensive
damage when the engine is started.
ENGINE LUBRICATION
Full pressure lubrication through a full flow oil filter, is
furnished by a gear-type oil pump. The distributor, driven by
a helical gear on the camshaft, drives the oil pump. The main
oil gallery feeds oil, through drilled passages, to the camshaft
and crankshaft to lubricate the bearings. The valve lifter oil
gallery feeds the valve lifters which, through hollow push
rods, feed the individually mounted rocker arms (Fig. 6A6-1).
SERVICE PROCEDURES
ENGINE MOUNTS
Engine mounts are the nonadjustable type and seldom
require service. Broken or deteriorated mounts should be
replaced immediately, because of the added strain placed on
other mounts and drive line components.
CHECKING ENGINE M O U N T S
Front Mount
Raise the engine to remove weight from the mounts and
to place a slight tension in the rubber. Observe both mounts
while raising engine. If an engine mount exhibits:
a. Hard rubber surface covered with heat check cracks;
b. Rubber separated from a metal plate of the mount;
or
c. Rubber split through center.
Replace the mount. If there is relative movement
between a metal plate of the mount and its attaching points,
lower the engine on the mounts and tighten the screws or nuts
attaching the mount to the engine, frame or bracket.
Rear Mount
Raise the vehicle on a hoist. Push up and pull down on
the transmission tailshaft while observing the transmission
mount. If the rubber separates from the metal plate of the
mount or if the tailshaft moves up but not down (mount
bottom out) replace the mount. If there is relative movement
between a metal plate of the mount and its attaching point,
tighten the screws or nuts attaching the mount to the
transmission or crossmember.
FRONT M O U N T REPLACEMENT
1. Remove mount retaining bolt from below frame
mounting bracket.
2. Raise front of engine and remove mount-to-engine
bolts and remove mount.
CAUTION: Raise engine only enough for
suficient clearance. Check for interference
bet ween rear of engine and cowl panel.
3. Replace mount to engine and lower engine into place.
4. Install retaining bolt and torque all bolts to
specifications.
REAR M O U N T REPLACEMENT
1. Support engine weight to relieve rear mounts.
2. Remove crossmember-to-mount bolts.
3. Remove mount-to-transmission bolts, then remove
mount.
4. Install new mount on transmission.
5. While lowering transmission, align and start
crossmember-to-mount bolts.
6. Torque bolts to specifications then bend lock tabs to
bolt head as applicable.
INTAKE MANIFOLD
Removal
1. Drain radiator and remove air cleaner.
2. Disconnect:
0
Battery negative cable at battery.
0
Radiator upper hose and heater hose at manifold.
0
Accelerator linkage at carburetor.
0
Fuel line at carburetor.
0
Crankcase ventilation lines.
0
Spark advance hose at distributor.
3. Remove distributor cap and mark rotor position with
chalk, then remove distributor.
4. Remove (as required) air cleaner bracket, accelerator
return spring and bracket, and accelerator bellcrank.
5. Remove generator upper mounting bracket.
6. Remove manifold attaching bolts, then remove
manifold and carburetor as an assembly. Discard gaskets and
seals.
7. If manifold is to be replaced, transfer:
0
Carburetor and carburetor attaching bolts.
0
Temperature sending unit.
0
Thermostat with housing (use new gasket).
0
Heater hose and water pump by-pass adapters.
EGR Valve (use new gasket).
0
TVS Switch (if applicable).
0
Vacuum fittings(s).
0
Choke Spring Assembly (where applicable).
Installation
1. Clean gasket and seal surfaces on manifold, block, and
cylinder heads.
2. Install manifold seals on block and gaskets on cylinder
heads (Fig. 6A6-2). Use sealer at water passages and where
seals butt to gaskets.
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