Description; Engine Tests And Adjustments - Plymouth Pl4S Service Manual

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ENGINE 103
DATA AND SPECIFICATIONS-Cont'd
.
Year 1942 1941 1937-40 1936
Distance from top of
i
cylinder block to Ys Ys Ys Ys
valVe guide, inches
Intake valve tappet
""
clearance (hot),
.008 .008 .006 .006
.,
inches
~
- - - - - - - -
- - - - - - - - - - - - - - - -
0
() Exhaust valve tap-
J,
pet clearance
.010 .010 .008
.008
"
(hot), inches
""
·a - - - - - - - - - - - - - - - -
l'J
Intake valve tappet
·c
clearance (cold),
.009 .009 .007 .007
d
inches
"
"
- - - - - - - - - - - - - - - - - - - - - - - -
bll
Exhaust valve tap-
·§
P.
pet clearance
.014 .014 .012 .012
rJl
(cold), inches
. .
- - - - - - - -
"
Valve spring
~
pres-
sure, valve closed,
40-45 @ 1%: 40-45 @ 1%: 34-38 @ 1%: 34-38 @ 1%:
:>
pounds and inches
~
- - - - - - - -
- - ·
Valve
spring pres-
-5i
Ei
sure, valve open,
107-115 @ 1% 107-115 @ 1%
77-83 @ 1!{6
77-83 @
1~6
"'
pounds and inches
()
- - - - - - - - - - - - - - - - - - -
Camshaft end play,
inches
.002-.006 .002-.006 .002-.006 .002-.006
- - - - - - - -
- - - - - ·
- - - - - - - - - - -
Camshaft bearing
clearance, inches .001-.003
1. DESCRIPTION.
193642-The Plymouth engine is a
6-cylinder, L-head type, equipped with hard-
ened seat inserts for the exhaust valves and
replaceable camshaft, crankshaft and con-
necting rod bearings. All bearings are lubri-
cated under pressure through a system of
drilled passages. The pistons, piston pins,
cylinder walls and valve tappets are lubri-
cated by oil spray from the lower connecting
rod bearings. Full length water jackets and
a water distributor tube provides uniform
cooling of the cylinder block.
2. ENGINE TESTS AND
ADJUSTMENTS.
193642-To maintain engine operating
efficiency, keep the units of the ignition and
fuel systems in proper adjustment. Vacuum
and compression tests will reveal the oper-
.001-.003 .001-.003 .001-.003
ating condition of the engine and indicate
the need for engine tune-up or replacement
of internal parts.
a. Test Compression. With the engine
at normal operating temperature, remove
all spark plugs and install compression gauge
in one cylinder. Hold throttle wide open and
crank engine with starter until maximum
reading is obtained. Note reading and test
the other 5 cylinders. If reading indicated by
the compression gauge is reasonably high,
90 pounds or higher at sea level (with a re-
duction of approximately 3 lb. for each
1000 feet altitude), compression pressures
can be considered normal. If pressure in any
cylinder is weak, make the following inspec-
tions:
( 1 ) Inject oil in the spark plug hole on
top of the piston with the piston down.