Valve Timing; Camshaft Removal (8-Cylinder); Camshaft Inspection (8-Cylinder) - Jeep 1979 CJ-5 Technical & Service Manual

1B-44 ENGINES
(3) Remove spark plugs.
(4) Use piece of rubber tubing to secure dial in-
dicator on end of push rod (fig. 1B-70).
Fig. 11=70 Cam Lobe Lift Measurement
(5) Rotate crankshaft until cam lobe base circle
(push rod down) is under valve tappet.
(6) Set dial indicator to zero.
(7) Rotate crankshaft until point of maximum push
rod upward movement occurs.
(8) Read travel at dial indicator. Correct lift is 0.260
to 0.270 inch (6.604 mm to 6.858 mm) for 304 (5 liter) and
360 (6 liter) CID engines.
NOTE: Rocker arm ratio is 1.6:1. Multiply cam lift by
1.6 to determine valve lift.
Valve Timing
(1) Remove spark plugs.
(2) Remove cylinder head covers and gaskets.
(3) Remove rocker arms and bridged pivot assem-
blies from No. 1 cylinder.
(4) Rotate crankshaft until No. 6 piston is at top
dead center (TDC) on compression stroke. This places
No. 1 piston at TDC on exhaust stroke in valve overlap
position.
(5) Rotate crankshaft counterclockwise 90° as
viewed from front.
(6) Install dial indicator on No. 1 intake valve push
rod end.
(7) Set dial indicator to zero.
(8) Crank engine slowly in direction of normal rota-
tion (clockwise viewed from front) until dial indicator
indicates 0.020 inch (0.508 mm).
(9) This should place milled timing mark on vibra-
tion damper in line with TDC marking on timing case
cover. If more than 1/2-inch (13 mm) variation exists in
either direction, remove timing case cover and inspect
timing chain installation.
Check for incorrect camshaft sprocket indexing. The
sprocket keyway should align with the centerline of the
first lobe of the camshaft.
Camshaft Removal
(1) Drain radiator and cylinder block.
(2) Remove radiator assembly.
(3) If equipped with air conditioning, remove con-
denser and receiver assembly as charged unit.
(4) Remove cylinder head covers and gaskets.
(5) Remove rocker arms and bridged pivot assem-
blies. Remove two capscrews from each bridged pivot.
Alternately loosen capscrews one turn at a time to avoid
damaging bridge.
(6) Remove push rods.
NOTE: Keep push rods, rocker arm assemblies and
tappets in the same order as removed.
(7) Remove intake manifold assembly.
(8) Remove drive belts.
(9) Remove fan and hub assembly.
(10) Remove distributor.
(11) Remove damper pulley and vibration damper.
(12) Remove timing case cover.
(13) Install crankshaft screw with two or more flat
washers to provide means of rotating crankshaft.
(14) Rotate crankshaft until timing mark on crank-
shaft sprocket is closest to and on centerline with timing
mark on camshaft sprocket. Refer to Figure 1B-80.
(15) Remove retaining screw from camshaft. Re-
move retaining screw from crankshaft.
(16) Remove distributor drive gear and fuel pump
eccentric from the camshaft (fig. 1B-71).
(17) Remove crankshaft sprocket, camshaft sprocket
and timing chain as assembly.
(18) Remove hood latch support bracket, front
bumper or grille as required and remove camshaft.
Camshaft Inspection
Inspect the camshaft bearing journals for an uneven
wear pattern or rough finish. Replace camshaft if either
condition exists.
Inspect the distributor drive gear for damage or exces-
sive wear.
Inspect fuel pump eccentric for excessive wear.
Inspect each cam lobe and the matching hydraulic
valve tappet for wear. If the face of the tappet(s) is worn
concave and the matching camshaft lobe(s) is also worn,
replace both camshaft and tappet(s).