Jeep Wrangler 1997 Manual page 710

9-48
2.5L ENGINE
DISASSEMBLY AND ASSEMBLY (Continued)
(7)
Remove the timing chain bumper.
('8) Remove the oil slinger from crankshaft.
(9) Remove the camshaft retaining bolt and
remove the sprockets and chain as an assembly.
(10) Remove the camshaft .
(11) Remove the oil pan and gasket .
(12) Remove the timing chain tensioner.
(13) Remove the front and rear oil galley plugs.
(14) Remove the connecting rods and the pistons .
Remove the connecting rod and piston assemblies
through the top of the cylinder bores.
(15) Remove the crankshaft.
ASSEMBLY
(1)
Install the crankshaft.
(2) Install the connecting rods an
the pistons
through the top of the cylinder bores .
(3) Install the front and rear oil gal ey plugs.
(4) Install the timing chain tension~r.
(5) Install the camshaft .
(6) Install the sprockets and chain a an assembly.
(7) Install the oil slinger to the crankshaft.
(8) Install the timing chain bumper.
(9) Install the timing case cover sea[.
(10) Install the timing case cover.
(11) Install the oil pan gasket and
Oil
pan .
(12) Install the vibration damper.
(13) Install the water pump . Tighten the mounting
bolts to 31 N-m (270 in. lbs .) torque.
(14) Remove the distributor from~the cylinder
block .
(15) Lubricate the oil filter seal wit clean engine
oil . Tighten oil filter to 18 N-m (13 ft. lbs .) torque .
(16) Install the engine into the vehi le.
(17) Fill the engine with clean lubrication oil .
(18) Fill the cooling system .
CLEANING AND INSPECTION
ROCKER ARMS AND PUSH RODS
CLEANING
Clean all the components with cleaning solvent .
Use compressed air to blow out the oil passages in
the rocker arms and push rods.
INSPECTION
Inspect the pivot surface area of each rocker arm .
Replace any that are scuffed, pitted, cracked or
excessively worn.
Inspect the valve stem tip contact surface of each
rocker arm and replace any rocker arm that is deeply
pitted.
Inspect each push rod end for excessive wear and
replace as required . If any push rod is excessively
i
TJ
worn because of lack of oil, replace it and inspect the
corresponding hydraulic tappet for excessive wear .
Inspect the push rods for straightness by rolling
them on a flat surface or by shining a light between
the push rod and the flat surface .
A wear pattern along the length of the push rod is
not normal. Inspect the engine cylinder head for
obstruction if this condition exists .
HYDRAULIC TAPPETS
CLEANING
Clean each tappet assembly in cleaning solvent to
remove all varnish, gum and sludge deposits .
INSPECTION
Inspect for indications of scuffing on the side and
base of each tappet body.
Inspect each tappet base for concave wear with a
straightedge positioned across the base . If the base is
concave, the corresponding lobe on the camshaft is
also worn. Replace the camshaft and defective tap-
pets.
ENGINE CYLINDER HEAD
CLEANING
Thoroughly clean the engine cylinder head and cyl-
inder block mating surfaces. Clean the intake and
exhaust manifold and engine cylinder head mating
surfaces . Remove all gasket material and carbon .
Check to ensure that no coolant or foreign material
has fallen into the tappet bore area.
Remove the carbon deposits from the combustion
chambers and top of the pistons .
INSPECTION
Use a straightedge and feeler gauge to check the
flatness of the engine cylinder head and block mating
surfaces.
CYLINDER BLOCK
CLEANING
Thoroughly clean the oil pan and engine block gas-
ket surfaces.
Use compressed air to clean out :
" The galley at the oil filter adaptor hole, the filter
bypass hole (Fig. 63) .
" The front and rear oil galley holes (Fig. 64) (Fig.
65) .
" The feed holes for the crankshaft main bearings.
Once the block has been completely cleaned, apply
Loctite PST pipe sealant with Teflon 592 to the
threads of the front and rear oil galley plugs. Tighten
the plugs to 41 N-m (30 ft. lbs .) torque.