Camshaft And Bearings; Oil Deflector And Valve Spring Installation; Measuring Cam Lobe Lift; Checking Valve Timing - Jeep 1979 CJ-5 Technical & Service Manual

11-8 ENGINES
A J 4 1 8 8 5
Fig. 1B-13 Valve Spring Tester
Oil Deflector and Valve Spring installation
(1) Use 7/16-inch deep socket and small hammer to
gently tap oil deflector onto valve stem.
CAUTION: Install the deflector carefully to prevent
damage from sharp edges of the valve lock grooves.
(2) Install valve spring and retainer.
(3) Compress valve spring with tools J-22534-1, J-
22534-4 and J-22534-5 and insert valve locks. Release
spring tension and remove tools.
NOTE: Tap spring from side-to-side to be certain
spring is seated properly at cylinder head.
(4) Disconnect air hose, remove adapter from spark
plug hole and install spark plug.
(5) Install push rods. Make certain bottom end of
each rod is centered in plunger cap of hydraulic valve
tappet.
(6) Install rocker arms and bridged pivots. At each
bridged pivot, tighten capscrews alternately, one turn at
a time, to avoid damaging bridge.
(7) Install cylinder head cover and gasket.
Camshaft and Bearings
The camshaft is supported by form steel-shelled, lab-
bitt-lined bearings pressed into the block and line
reamed. The step-bored camshaft bearing bores are
larger at the front beasing than at the rear to permit
easy removal and installation of the camshaft. Cam-
shaft bearing are lubricated under pressure.
NOTE: It is not advisable to replace camshaft bearings
unless equipped with special removal and installation
tools.
Camshaft end play is maintained by the load placed
on the camshaft by the oil pump and distributor drive
gear. The helical cut of the gear holds the camshaft
sprocket thrust face against the cylinder block face.
Camshaft end play is zero during engine operation.
Measuring Cam I s l e Lift
(1) Remove cylinder head cover and gasket.
(2) Remove rocker a r m s and bridged pivot
assemblies.
(3)"Remove sparkplugs.
(4) Install dial indicator on end of push rod. Use
piece of rubber tubing to hold dial indicator plunger
squarely on push rod (fig. 1B-14).
Fig. 1 1 - 1 4
Ci«
L i I Q
Lilt
Measurement
. (5) Rotate crankshaft until cam lobe base circle
(push rod down) is under valve tappet. Set dial indicator
to zero.
(6) Rotate, crankshaft until push rod reaches its
maximum upward travel. Read travel at dial indicator.
Correct cam lobe lift is and 0.242- to 0.254-inch (6.147
mm to 6.451 mm). :
Checking Valve Timing
(1) Disconnect ignition wires and remove spark
plugs.
(2) Remove cylinder head cover and gasket.
(3) Remove rocker arms and bridged pivot from No.
1 cylinder.
(4) Rotate crankshaft until No. 6 piston is at TDC
on compression stroke.