Ford 1954-55 F-Series Truck User Manual

Section 5-Rocker Mechanism, Cylinder Head, Valves, Valve lash Adiustment, and Valve Timing 21
Back off on the No. 1 valve adjusting screw an d
pu sh the r ocke r arm to one side, then in sta ll a dial
indicator as shown in fig. 28 . Zero the dial indicator,
t he n rotate the engine sl ow ly until the de sir ed lift is
obtained, as tabulated in Tabl e 2. Compare th e degrees
on the pulley to the specifications .
If the va l ve timing is not within spec ifi cat ions, make
sure the timing pointer has not been bent. This is done
by bringing No. 1 piston to T.D.C. a nd noti cing if the
timin g pointer is in alignment with the T .D.C. mark
on the crankshaft pulley. If the pointer is not at fault,
it will be necessary to check the following ite ms in the
order of accessibility: timin g chain; camshaft sprocket;
crankshaft sprocket; camshaft; crank s haft pulley ; and
cranks h aft .
Engine
223
239
256
279
317
Table 2-Valve Timing Specifications
Camshaft
Intak e Tappet Lift ( Open s)
At Crankshaft Degrees ( B.T.D.C.
EBP-62s0-C
13° BTDC With .013 Cam
Lift
ECE-62 sO-A
8°
BTDC With .015 Cam
L ift
ECE-62s0 -A
8
0
BTDC With .015 Cam
Lift
EAM-62s0-D
18 ° BTDC With .010
Cam Lift
EAM-62s0-D
18 ° BTDC With .010
Cam Lift
6. CAMSHAFT SPROCKET, CAMSHAFT, AND CAMSHAFT BEARINGS
Procedures for the inspection a nd rep air of th ese
components are cont a ined in the following paragraphs.
a. Camshaft Sprocket and Timing Chain.
Before the timing chain is removed, measure the
outward deflection from a straight line of the slack side
of the chain (fig. 29). If the o utward deflection exceeds
V2 -inch, replace the timing chain .
(1) INSPECTION. Remov e the camshaft sprocket
and timing chain. Inspect the spr oc ket f or broken,
chipped , or worn te et h. Ch ec k the timing chain for
loose
or worn link pins.
(2) REPAIR S. Replace a sp rock et that h as broken ,
chipped, or worn teeth. Replace a timing chain that
has loose or worn link pins.
b. Camshaft and Camshaft Bearings.
Th e camshaft must be repl ace d when the lobes are
worn to such an extent that the cam lob e li ft (intake
and exhaust) is less than the minimum allowable toler-
ance. Check cam lift with a dial indi ca tor as sh own in
fig. 28. It wi ll be necessary to fabricate a clip to hold
the push rod. The clip shown in fig. 28 is made from
banding iron.
(1) INSPECTION. Before the camshaft is removed ,
check the end play for conformance to specificat ions
using a dial indicator in the following manner:
Push the camshaft toward the r ea r of the engine.
Place a dial indicator against the front side of the
camshaft flange. Set the di a l to zero, then pull the
camshaft fo rward. Compare the dial indicator reading
with specifications.
Rem ove the camshaft. Thoroughly check the cam-
shaft for cracks with a magnifying glass. Examine the
lobe s for pitting, scoring, and signs of ab n ormal wear.
Che ck the lobes with a micrometer. Susp ected worn
lobe s sho uld be compared wit h a good lobe to be sure
diagnosis is correct. Me asure the journal for wear and
out - of -r oun dnes s. Mea s ur e the ca mshaft front bearing
to journal clear a nce for co nformance to specifications.
Check th e distributor drive gear for broken or worn
t ee th. Ch ec k th e fuel pump eccentric for wear .
(2) REPAIRS. R ep l ace all camshafts that have
cracks or seve rely sc uffed or scored lobes. Remo ve light
scuffs
or scores with a hard Arkansas stone, then po li sh
the l obes with c rocus cloth. Rem ove raised met al from
sma ll nick s and abras ions elsewhere on the camshaft in
the same manner.
If the front journal to bearing clearance is excessive,
it can be ass um ed that all bearings are worn and need
replacem ent.
If any of the teet h on the distributor drive gear are
broken or worn , it will be necessary to replace the
camshaft.
If the end play is excessive, replace the thrust plate
and / or spacer.
FIRST TAKE UP SLACK OF
POSITION OF CHAIN SHOWN IN DOnED OUnINE. THEN , TAKE UP
SLACK ON DRIVING SIDE OF CHAIN AND MEASURE SLACK SIDE . 1781
Fig . 29-Timing Chain Dellection Check

Ford 1954-55 F-Series Truck Specifications

General

Brand	Ford
Model	1954-55 F-Series Truck
Category	Trucks
Language	English