MULTICYLINDER ENGINES
6. Clean any gasket residue from the exhaust manifold
and cylinder head.
7. Remove the exhaust manifold cover retaining screws
and remove the manifold cover
(Figure
7).
8. Inspect the exhaust manifold and cover for warpage,
carbon buildup and corrosion.
9. Reinstall the exhaust manifold and cover by reversing
the removal procedure. Tighten the retaining nuts to the
torque specified in Table 2.
2GMF, 2GM20F, 3GMF, 3GM30F,
3HMF
and
3HM35F
models with freshwater (closed)
cooling system
Refer to
Figure
6.
1. Refer to Chapter Four and drain the cooling system.
2. Detach the exhaust hose from the exhaust elbow.
3. Remove the water hose from the exhaust manifold and
thermostat housing.
4. Remove the water hose from the exhaustmanifold and
freshwater pump.
5. Disconnect the water hoses from the manifold end
caps.
6. Disconnect the water hose to the overflow tank.
7. Remove the exhaust manifold from the cylinder head.
8. Clean any gasket residue from the exhaust manifold
and cylinder head.
9. Check the exhaust manifold for warpage, carbon
buildup and corrosion.
10. Ifnecessary, refer to Chapter Eight to service the heat
exhanger inside the exhaust manifold.
11. Reverse the removal procedure to install the exhaust
manifold. Tighten the manifold bolts to the torque speci-
fied in Table 2. Fill the freshwater section
of
the closed
105
cooling system with coolant as described in Chapter
Three.
CYLINDER
HEAD
Removal
In some instances, the cylinder head may be removed
for service without removing the engine.
If
engine re-
moval is necessary, referto the engine removal procedure.
Refer to
Figure
8 for an exploded view
of
the cylinder
head assembly.
To remove the cylinder head, proceed as follows:
1. Disconnect the negative battery cable from the nega-
tive battery terminal.
2.
If
not previously performed, drain the cooling system
as described in Chapter Four.
3. Remove the alternator
as described in Chapter Eight.
4. Remove the exhaust manifold as previously described.
5. Disconnect the wire lead from the water temperature
sender
(Figure
9).
6A.
Engines with standard
cooling-Disconnect
the
lowerwater hose
(Figure
9) from the thermostat housing.
6B.
Engines with freshwater (closed) cooling sys-
tem-Remove
the freshwater pump as described in Chap-
ter Eight.
7. Remove the air cleaner and the air cleaner base.
8. Remove the fuel injector and precombustion chamber
as described in Chapter Seven.
9. Remove the valve cover as previously described.
10. Remove the nuts that retain the rocker arm stands
(Figure
10), then remove the rocker shaft assembly.
11. Remove the push rods and mark them so they can be
reinstalled in their original positions.
12. Detach the oil line fitting from the cylinder head.
13. Unscrew the smaller cylinder head retaining bolts
first, then unscrew the larger bolts and nuts in a crossing
pattern.
14. Remove the cylinder head and head gasket.
Inspection
1. Refer to the Anticorrosion Maintenance section in
Chapter Three. Remove and inspect the sacrificial anode.
Install the anode in the cylinderhead after completing cyl-
inder head service.
2.
If
service to the valves or rocker assembly is required,
refer to the
Valves and Rocker Assembly sections.
3. Check the cylinder head for signs
of
oil or water leak-
age before cleaning. Look for corrosion or foreign mate-
rial in the oil and water passages.
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