Camshaft And Drive; Valve Spring Tension Test; Camshaft Replacement; Testing Valve Spring—Typical - Jeep J-10 Series 1982 Technical & Service Manual

Valve Spring Tension Test
Use Valve Spring Tester J-8056, or equivalent, to test
each valve spring for the specified tension values (fig.
1B-9). Replace springs that are not within specification
and that bind because of warpage.
Rg. 1B-9 Testing Valve Spring—Typical
Installation
TOOL
J-8056
41885
Always install a new valve stem oil seal whenever
valve spring retainer cap locks have been disturbed.
(1) Position oil seal, spring, shield and cap over
valve stem.
(2) With Tool J-5892-1, compress valve spring and
install retainer cap locks. Remove tool.
(3) Install rocker arm, pivot ball and capscrew over
stud. Tighten capscrew with 20 foot-pounds (27 N»m)
torque. Do not overtighten.
(4) Install cylinder head cover.
(5) Remove air hose adapter and install spark plug.
CAMSHAFT AND DRIVE
The cast iron camshaft is supported by three bearings
and is gear driven. An iron crankshaft gear drives the
camshaft through a plastic composition timing gear
with a steel hub (fig. 1B-10).
The cam lobes are ground, hardened and tapered with
the high side toward the rear. This, coupled with the
spherical face on the tappet, causes the tappets to rotate.
The camshaft bearings are lubricated through oil
holes that intersect the main oil gallery.
ENGINES 1B-7
Rg. IB-10 Camshaft and Crankshaft Gears
Camshaft Replacement
Removal
(1) Remove air cleaner.
WARNING: DO NOT remove block drain plugs or
loosen radiator draincock with system hot and under
pressure because serious burns from coolant can occur.
(2) Drain cooling system.
NOTE: Do not waste reusable coolant. If solution is
clean, drain coolant into a clean containerfor reuse.
NOTE: It may be necessary to attach a flexible hose to
the drains to route the coolant to the container.
(3) Remove timing gear cover. Refer to Timing Gear
Cover Removal for procedure.
(4) Disconnect radiator hoses at radiator. Remove
radiator. Refer to Radiator Removal in Chapter
1C—Cooling Systems.
Rg. IB-11 Removing Camshaft Thrust Plate Screws