Exhaust Manifold Cleaning And Inspection - Jeep 1987 Wrangler Workshop Manual

ENGINES
4.2 LITER (258 CID) SIX-CYLINDER ENGINE
NOTE: Retain the push rods, bridges, pivots
and rocker arms in the same order as removed
to facilitate installation in the original locations.
Disconnect the power steering pump bracket.
Set the pump and bracket aside. Do not
disconnect the hoses.
Remove the intake and exhaust manifolds from
the cylinder head. Refer to Intake and Exhaust
Manifold Removal for the procedures.
If equipped with air conditioning, perform the
following:
• remove the air conditioner compressor drive
belt idler pulley bracket from the cylinder head
• loosen the alternator drive belt and remove the
alternator bracket-to-cylinder head mounting
screw
N O T E : The serpentine drive belt tension is
released by loosening the alternator.
• remove the bolts from the A/C compressor
mounting bracket and set the compressor
aside
Disconnect the ignition wires and remove the
spark plugs.
Disconnect the temperature sending unit wire
connector and battery negative cable.
Remove the ignition coil and bracket assembly.
Remove the cylinder head bolts, cylinder head
and gasket.
86320
EXHAUST MANIFOLD CLEANING
AND INSPECTION
Thoroughly clean the machined surfaces on the
cylinder head and block. Remove all gasket
material and cement.
R e m o v e any c a r b o n d e p o s i t s from the
combustion chambers and the top of the
pistons.
Use a straightedge and feeler gauge to check
the flatness of the cylinder head and block
mating surfaces. Refer to the Specifications
chart.
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