Infiniti QX56 (Z62). Manual — part 667
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< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
• Use a piston ring expander (commercial service tool) (A).
CAUTION:
• When removing piston rings, be careful not to damage
piston.
• Be careful not to damage piston rings by expanding them
excessively.
7.
Remove piston from connecting rod as per the following:
a.
Using snap ring pliers (A), remove snap rings.
b.
Heat piston to 60 to 70
°
C (140 to 158
°
F) with an industrial use
dryer (A) or an equivalent.
c.
Push out piston pin using a stick that has an outer diameter of
approximately 20 mm (0.79 in).
8.
Remove rear oil seal and rear oil seal retainer assembly from cylinder block.
• Insert screwdriver or similar tool between rear end of crankshaft counter weight and rear oil seal
retainer, and separate liquid gasket to remove.
CAUTION:
Be careful not to damage the mating surfaces.
9.
Using screwdriver or similar tool, and lever off rear oil seal from rear oil seal retainer.
10. Remove main bearing cap as per the following:
• Before loosening cylinder block bolts, measure the crankshaft end play. Refer to
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a.
Loosen side bolts starting from No. 30 to 21 to remove.
b.
Loosen main bearing cap sub bolts starting from No. 20 to 11 to
remove.
c.
Loosen main bearing cap bolts starting from No. 10 to 1 to
remove.
d.
Remove the main bearing cap.
• Insert bolts (1) into bolt holes, and then remove main bearing
cap (2) by lifting up and shaking forward and backward.
CAUTION:
Be careful not to damage the mounting surface.
11. Remove crankshaft.
12. Remove main bearings and thrust bearings from main bearing cap and cylinder block.
CAUTION:
• Be careful not to drop main bearing, and to scratch the surface.
• Identify installation positions, and store them without mixing them up.
13. Remove pilot converter using the pilot bushing puller (commercial service tool), if necessary.
14. Remove oil jet.
ASSEMBLY
1.
Fully air-blow engine coolant and engine oil passages in cylinder block, cylinder bore and crankcase to
remove any foreign material.
CAUTION:
Use goggles to protect your eyes.
: Engine front
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< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
2.
Install each plug to cylinder block as shown in the figure.
• Tighten each plug as specified below.
• Replace washers (1), (5) with new ones.
• Apply sealant to the thread of water drain plug (3).
Use Genuine RTV silicone sealant or equivalent. Refer to
GI-22, "Recommended Chemical Products and Sealants"
.
• Apply sealant to the thread of plug (4).
Use high strength thread locking sealant or equivalent.
Refer to
GI-22, "Recommended Chemical Products and
.
3.
Install pilot converter to crankshaft, if removed.
• With drift [outer diameter: approx. 35 mm (1.38 in)], press-fit
as far as it will go.
• Press-fit pilot converter with its chamfering side facing crank-
shaft as shown in the figure.
4.
Install main bearings and thrust bearings as per the following:
CAUTION:
Be careful not to drop main bearing, and to scratch the surface.
a.
Remove dust, dirt, and engine oil on bearing mating surfaces of cylinder block and main bearing caps.
: Engine front
for symbols in the figure.
Part
Tightening torque
Plug (2)
78.0 N·m (8.0 kg-m, 58 ft-lb)
Water drain plug (3)
19.6 N·m (2.0 kg-m, 14 ft-lb)
Plug (4)
53.9 N·m (5.5 kg-m, 40 ft-lb)
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: Crankshaft side
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b.
Install thrust bearings (2) to both sides of the No. 3 journal hous-
ing on cylinder block (1).
• Install thrust bearings with the oil groove (A) facing crankshaft
arm (outside).
c.
Install main bearings paying attention to the direction.
• Main bearing with oil hole (B) and groove (C) goes on cylinder
block. The one without them goes on main bearing cap.
• Before installing main bearings, apply engine oil to the bearing
surface (inside). Do not apply engine oil to the back surface,
but thoroughly clean it.
• When installing, align main bearing stopper protrusion to cut-
out of cylinder block and main bearing.
• Ensure the oil holes on cylinder block and those on the corre-
sponding bearing are aligned.
5.
Install crankshaft to cylinder block.
• While turning crankshaft by hand, check that it turns smoothly.
6.
Install main bearing caps as per the following:
• Align the identification number to the journal position to install.
• Install it with the front mark (indicated by stamping) facing the
front of engine.
• Using plastic hammer or similar tool, tap them lightly to seat
them on the installation position.
NOTE:
Main bearing cap cannot be replaced as a single parts,
because it is machined together with cylinder block.
7.
Install each main bearing cap bolts as per the following:
CAUTION:
If main bearing cap bolts and sub bolts are re-used, check their outer diameters before installa-
tion. Refer to
.
a.
Apply new engine oil to threads and seat surfaces of main bearing cap bolts and sub bolts.
b.
Tighten all bolts in order of (No. 1 - 30) temporarily.
c.
Tighten main bearing cap bolts (M12) in order of No. 1 - 10.
d.
Tighten main bearing cap sub bolts (M9) in order of No. 11 - 20.
3
: Main bearing (upper) (cylinder block side)
4
: Crankshaft
5
: Main bearing (lower) (main bearing cap side)
: Engine front
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: Engine front
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: Engine front
: 39.2 N·m (4.0 kg-m, 29 ft-lb)
: 29.4 N·m (3.0 kg-m, 22 ft-lb)
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