Engine Does Not Develop Normal Power - Plymouth Pl4S Service Manual

26
PLYMOUTH SERVICE MANUAL
3. ENGINE TURNS BUT
wn.t
NOT
START.
193642--cont' d
( 11) If there is no arc of current when
the distributor points are pushed apart with
the finger," with the ignition switch turned on,
turn the engine until the distributor points
are open and connect the positive lead from
a voltmeter to any part of the chassis that
will provide a definite ground and test the
circuit.
( 12)
Hold the negative lead from the
voltmeter against the input post of the igni-
tion switch. If approximate battery voltage
is shown on voltmeter, the circuit is complete
to the ignition switch.
( 13) Hold the negative lead against
the output post of the ignition switch. If
about the same voltage is shown, current is
passing through the switch.
( 14) Hold the negative lead against
the post of the coil where the ignition switch
wire is connected. If battery voltage is
shown, current is reaching that post.
( 15 ) Hold the negative lead against
the post on the coil where the primary wire
to the distributor is connected and then to
the distributor breaker arm. If battery volt-
age is shown at one of these points of test
and not at the other, the difficulty will be
located between the two points. If very little
or no voltage is shown at the coil and breaker
arm, disconnect the condenser lead wire
from the distributor body and connect the
voltmeter lead to the breaker arm; if normal
battery voltage is shown, the condenser is
shorted. No voltage reading between the coil
and breaker arm (with the distributor points
open and the condenser lead disconnected)
would indicate a broken primary circuit in
the ignition coil.
( 16) If all tests and inspections in steps
( 1 ) through ( 15) are satisfactory and the
engine will not start, pull the ignition coil
to distributor secondary wire out of the dis-
tributor cap and turn on the ignition switch.
Hold the end of the wire % inch from the
cylinder head and crank the engine. If spark
does not jump the
%
inch gap, replace the
ignition coil.
c. Inspect Fuel System.
( 1) Disconnect the fuel tube at the
carburetor and crank the engine.
( 2)
If fuel is discharged from the dis-
connected tube it will reach the combustion
chambers unless the carburetor float valve is
stuck or the carburetor jets are clogged.
( 3) If no fuel is discharged from the
disconnected tube, inspect the fuel filter,
fuel tubes, fuel tank cap for restriction, and
· fuel pump inlet and outlet valves for dirt,
warpage and broken springs.
3. ENGINE DOES NOT DEVELOP
NORMAL POWER.
193642
( 1) Check ignition timing and reset if
necessary.
( 2) Check automatic advance of dis-
tributor against advance curve in "Data and
Specifications" chart on page 144.
( 3) Service the carburetor air cleaner.
See paragraph 5 on page 14.
( 4) Connect a low pressure gauge be-·
tween the fuel pump and carburetor and
crank the engine with the starter. If the fuel
pressure shown on the gauge is less than 3
pounds, repair or replace the fuel pump. If
fuel is delivered under normal pressure to
the carburetor, disassemble and inspect the
carburetor.
( 5 ) Inspect the exhaust pipe, muffler
or tail pipe for being clogged or damaged
and repair or replace any damaged parts.
( 6) Make vacuum and compression
tests; if the compression is low on one or
more cylinders, check valve tappet clear-
ance, grind valves or replace the piston rings
as indicated by tests.
( 7) Check valve timing. See paragraph
11 on page 110.