Exhaust Manifolds-Removal And Installation - Jeep cherokee 1989 Owner's Manual

2B-4
8.13 If a machined groove (arrow) is not present on the
underside of the rear of the manifold, scribe marks to
outline the area to be ground out
12 Thoroughly clean all sealing surfaces, removing all traces of oil and
old gasket material. Clean the intake manifold bolt holes in the cylinder
head by chasing them with a tap. Compressed air can be used to
remove the debris after chasing. Warning: Wear eye protection when
using compressed air.
13 Inspect the underside of the rear of the intake manifold t o see if
a machined groove (see illustration) is present. This groove was added
to later production models to improve oil sealing.
14 You may add this groove to early models yourself or take the mani-
fold to a dealer or automotive machine shop to have it done.
15 Place tape over the intake manifold ports t o keep out metal chips.
16 Scribe marks on the intake manifold rear flange (see illustration
17 Obtain a die grinder or electric drill and a spherical cutter with a
1 8 Cut a groove 311 6-inch wide by 1 I1 6 t o 118-inch deep. This pro-
vides a groove to hold RTV sealant when the manifold is installed on
the engine.
19 Thoroughly clean the intake manifold, removing all chips and tape.
2 0 Apply a 311 6-inch bead of RTV to each of the ridges between the
heads (see illustration).
21 Install new intake manifold gaskets, noting that they are marked
Right and Left. Be sure to install them as indicated.
22 Hold the gaskets in place by extending the RTV sealant bead up
8.23 intake manifold gasket must be cut as shown before
installing so the top can be positioned behind the pushrods
it
The Motor Manual Guy
2 B V6
Chapter Part
8.17
8.20 Apply RTV t o the block ridges between the heads (arrows)
114-inch onto the gasket ends.
23 The intake manifold gaskets will have t o be cut where indicated
t o position the tops behind the pushrods (see illustration). Cut only
those areas necessary to clear the pushrods.
2 4 Install the intake manifold on the engine and hand tighten the bolts.
Ensure the areas between the block ridges and intake manifold are com-
pletely sealed.
25 Working in the sequence shown (see illustration), tighten the
manifold bolts, in several steps, t o the specified torque.
26 Reinstall the remaining parts in the reverse order of removal.
27 Run the engine, adjust the ignition timing and check for oil and
vacuum leaks.
9 Exhaust manifolds
Refer to illustration 9.7
Warning: Allow the engine to cool to room temperature before perform-
ing thi~-~rocedure.
8.25
engine
Use a 3116-inch diameter cutter to form a groove in
the manifold
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removal and installation
Intake manifold bolt tightening sequence