Vacuum test.

disconnected lines and ports from which they were

flashing beam of timing light through hole in flywheel

removed, to keep dirt out of systems.

housing at distributor side of engine. If ignition timing is

(5) Attach the hook of a chain hoist to the lifting eye

correct, light flash will show D-C on flywheel aligned with

of engine. Lift engine enough to relieve weight on engine

mark on flywheel housing as plug fires.

supporting parts yet to be removed.

(4) Vacuum test.

(6) Remove screws and washers shown, and

(a) Remove slotted plug from check valve adapter

remove rear engine mount. Remove nut, bolt, washers,

Tee-fitting to intake manifold and install an adapter to

and rubber sandwich mounting at each front mounting

receive vacuum gauge hose. Connect vacuum gauge to

bracket.

adapter.

Remove twelve screws and washers which attach

(b) With engine warm, and idling at 450 to 500 rpm,

transmission to engine.

vacuum gauge reading should be between 17 and 21

(7) Swing engine toward rear of truck until torque

inches of mercury, and steady. General indications are

converter on flywheel is free of transmission shaft. Lift

as follows:

engine free of truck.

d. Engine external parts removal. Remove parts

(d) Slow oscillation of gauge reading, usually with

for which instructions are given in this paragraph, only to

drifting engine idle speed:

carburetor idle mixture

the extent necessary to perform the intended task.

adjustment wrong.

Complete disassembly is necessary only when complete

(e) Low, steady reading: power loss affecting all

overhaul of the engine is planned.

cylinders equally. Possibly late timing, leaking induction

(1) Remove the following components:

system or rings, or mechanical drag on engine, such as

(a) Thermostat and housing, and cylinder

tight bearings.

head.

(f) Steady pulsing of gage: partial or complete loss

(b) Generator, water pump and fan belt.

of power in one (or more) cylinders. Burned or stuck

valve or leaky head gasket gives major pulsations.

linkage.

Fouled spark plug gives lesser fluctuations. Cross

(d) Starter, distributor, coil, spark plugs and

check indications with compression test.

capacitor.

c. Engine removal.

(e) Manifold, crankcase ventilator check

(1) Drain cooling system and crankcase.

valve, l;1 level gauge, valve covers.

(2) Remove the radiator, upper and lower hoses,

(2) Remove nut and washer at top and bottom of

and exhaust piping.

hydraulic pump mounting flange, remove pump, and

(3) Disconnect the following items, at the points

remove elbows and fittings from pump.

shown in Figure 6-30:

(3) Remove twelve screws and washers and

(a) Throttle and choke linkage.

remove oil pan and pan gasket.

(b) Battery cable, starter and ammeter leads.

(4) Remove screws and washers and remove

torque converter from flywheel.

(d) Oil filter lines. .

(5) Remove four cotter pins, nuts and washers and

(e) Engine temperature transmitter lead.

remove flywheel, using pry bar inserted through center of

(f) Carburetor air duct, and crankcase

flywheel.

breather hose.

(6) Remove screws and washers at left side,

(4) Drain hydraulic tank and disconnect hydraulic

securing flywheel housing to engine block and oil pan.

hoses at hydraulic pump. Disconnect fuel line at fuel

Remove corresponding screws at other side of housing,

pump, remove clamp on 'top of flywheel housing, and tie

and two screws and washers accessible from inside

this line out of way with light string. Seal off open ends

housing, and remove housing. It may be necessary to

tap housing with a soft hammer or mallet to loosen from

saddle or gasket sticking to block.

(7) Remove oil fill pipe and generator bracket by

removing attaching screws and washers.

Remove

retaining

101