engine NISSAN TEANA 2008 Service Manual

EM-98
< DISASSEMBLY AND ASSEMBLY >
CYLINDER HEAD
2. Remove cylinder head bolts in reverse order as shown in the fig-
ure with cylinder head bolt wrench (commercial service tool) and
power tool to remove cylinder heads (bank 1 and bank 2).
3. Remove cylinder head gaskets.
INSTALLATION
1. Install new cylinder head gaskets.
2. Turn crankshaft until No. 1 piston is set at TDC.
 Crankshaft key should line up with the bank 1 cylinder center
line as shown in the figure.
A: Bank 1
B: Bank 2
: Engine front
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1 : Crankshaft key
: Bank 1 side
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CYLINDER HEAD
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3. Install cylinder head follow the steps below to tighten cylinder
head bolts in numerical order as shown in the figure with cylin-
der head bolts wrench (commercial service tool).
CAUTION:
 If cylinder head bolts reused, check their outer diameters
before installation. Refer to EM-104, "
Inspection".
 Before installing cylinder head, inspect cylinder head dis-
tortion. Refer to EM-104, "
Inspection".
a. Apply new engine oil to threads and seat surfaces of cylinder
head bolts.
b. Tighten all cylinder head bolts.
c. Completely loosen all cylinder head bolts.
CAUTION:
In step “c”, loosen bolts in reverse order of that indicated in the figure.
d. Tighten all cylinder head bolts.
e. Turn all cylinder head bolts 103 degrees clockwise (angle tightening).
CAUTION:
Check the tightening angle by using the angle wrench [SST:
KV10112100 (BT8653-A)] (A). Avoid judgment by visual
inspection without.
 Check tightening angle indicated on the angle wrench indica-
tor plate.
f. Turn all cylinder head bolts 103 degrees clockwise again (angle
tightening).
4. After installing cylinder head, measure distance between front
end faces of cylinder block and cylinder head (bank 1 and bank
2).
 If measured value is out of the standard, reinstall cylinder
head.
5. Install in the reverse order of removal after this step.
A: Bank 1
B: Bank 2
: Engine front
: 98.1 N·m (10 kg-m, 72 ft-lb)
: 0 N·m (0 kg-m, 0 ft-lb)
: 39.2 N·m (4.0 kg-m, 29 ft-lb)
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Standard : 14.1 - 14.9 mm (0.555 - 0.587 in)
EMQ0662D

CYLINDER HEAD
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a. Apply new engine oil on valve oil seal joint and seal lip.
b. Install with the valve oil seal drift [SST: KV10115600 (J-38958)]
(A) press fit valve seal to height (b) shown in the figure.
NOTE:
Dimension: Height measured before valve spring seat installa-
tion.
4. Install valve spring seat.
5. Install valve.
 Install it in the original position.
NOTE:
Larger diameter valves are for intake side.
6. Install valve spring (uneven pitch type).
 Install narrow pitch end (paint mark) to cylinder head side
(valve spring seat side).
7. Install valve spring retainer.
8. Install valve collet.
 Compress valve spring with the valve spring compressor [SST:
KV10116200 (J26336-A)] (A), the attachment [SST:
KV10115900 (J26336-20)] (C) and the adapter [SST:
KV10109220 ( — )] (B). Install valve collet with a magnet
hand.
CAUTION:
When working, take care not to damage valve lifter holes.
 Tap valve stem edge lightly with plastic hammer after installa-
tion to check its installed condition.
9. Install valve lifter.
 Install it in the original position.
10. Install spark plug tube.
 Press-fit spark plug tube as follows:
a. Remove old liquid gasket adhering to cylinder head mounting hole.
b. Apply sealant to area within approximately 12 mm (0.47 in) from edge of spark plug tube press-fit side.
Use high strength thread locking sealant or equivalent. Intake and exhaust : 14.3 - 14.9 mm (0.563 - 0.587 in)
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A : Wide pitch
B : Narrow pitch
C : Paint mark
: Cylinder head side
Paint mark color: Blue
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EM-104
< DISASSEMBLY AND ASSEMBLY >
CYLINDER HEAD
c. Using a drift, press-fit spark plug tube so that its height (A) is as
specified in the figure.
CAUTION:
 When press-fitting, take care not to deform spark plug
tube.
 After press-fitting, wipe off liquid gasket protruding onto
cylinder-head upper face.
11. Install spark plug with the spark plug wrench (commercial service tool).
InspectionINFOID:0000000003802292
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Outer Diameter
 Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between (C) and (B)
exceeds the limit, replace them with new one.
 If reduction of outer diameter appears in a position other than (B),
use it as (B) point.
Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checking. Refer to EM-143,
"CylinderBlock".
1. Using a scraper, wipe off oil, scale, gasket, sealant and carbon deposits from surface of cylinder head.
CAUTION:
Never allow gasket fragments to enter engine oil or engine coolant passages.
2. At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions (A), (B), (C), (D), (E) and
(F).
 If it exceeds the limit, replace cylinder head.
INSPECTION AFTER DISASSEMBLY
Valve Dimensions
 Check the dimensions of each valve. For the dimensions, refer to EM-139, "CylinderHead".
 If dimensions are out of the standard, replace valve and check valve seat contact. Refer to "Valve Seat Con-
tact".
Valve Guide Clearance
Valve Stem Diameter
B : High strength thread locking sealant application area
Standard press-fit height: 37.7 - 38.7 mm (1.484 - 1.524 in)
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Limit [(C) - (B)] : 0.11 mm (0.0043 in)
A : Measuring point
d : 11 mm (0.43 in)
e : 48 mm (1.89 in)
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Limit : Refer to EM-139, "CylinderHead".
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EM-106
< DISASSEMBLY AND ASSEMBLY >
CYLINDER HEAD
 Check the valve spring pressure at specified spring height.
 If the installation load or load with valve open is out of the stan-
dard, replace valve spring.
INSPECTION AFTER INSTALLATION
Inspection for Leakage
The following are procedures for checking fluids leak, lubricates leak and exhaust gases leak.
 Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required
quantity, fill to the specified level. Refer to MA-11, "
Fluids and Lubricants".
 Use procedure below to check for fuel leakage.
- Turn ignition switch “ON” (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leak-
age at connection points.
- Start engine. With engine speed increased, check again for fuel leakage at connection points.
 Run engine to check for unusual noise and vibration.
 Warm up engine thoroughly to check there is no leakage of fuel, exhaust gases, or any oil/fluids including
engine oil and engine coolant.
 Bleed air from lines and hoses of applicable lines, such as in cooling system.
 After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to the
specified level, if necessary.
Summary of the inspection items:
*: Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.
Standard (Intake and exhaust)
: Refer to EM-139,
"CylinderHead". Free height
Installation height
Installation load
Height during valve open
Load with valve open
SEM113
Items Before starting engine Engine running After engine stopped
Engine coolant Level Leakage Level
Engine oil Level Leakage Level
Other oils and fluid* Level Leakage Level
Fuel Leakage Leakage Leakage
Exhaust gases — Leakage —

EM-112
< DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
 Loosen main bearing cap bolts in the reverse order shown in
the figure in several different steps.
10. Remove main bearing beam.
11. Remove main bearing caps.
CAUTION:
Be careful not to drop main bearing, and to scratch the sur-
face.
 Using main bearing cap bolts, remove main bearing cap while
shaking it back-and-forth.
12. Remove crankshaft.
13. Remove main bearings and thrust bearings from cylinder block and main bearing caps.
CAUTION:
 Be careful not to drop main bearing, and to scratch the surface.
 Identify installation positions, and store them without mixing them up.
14. Remove oil jet. (VQ35DE)
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 a goggles to protect your eye.
: Engine front
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PBIC0881E
EMQ0195D

CYLINDER BLOCK
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2. Install each plug to cylinder block as shown in the figure.
 Apply sealant to the thread of water drain plug (A).
Use Genuine Liquid Gasket or equivalent.
 Apply sealant to the thread of connector bolt (D).
Use Genuine Liquid Gasket or equivalent.
 Apply sealant to the thread of plug (C).
Use high strength thread locking sealant or equivalent.
 Replace washers with new one.
 Tighten each plug and connector bolt as specified below.
3. Install oil jet. (VQ35DE)
 Insert oil jet dowel pin (A) into cylinder block dowel pin hole,
and tighten mounting bolts.
4. Install main bearings and thrust bearings as follows:
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.
B : Water drain plug
PBIC2487E
Part Washer Tightening torque
A Yes 62.0 N·m (6.3 kg-m, 46 ft-lb)
B No 9.8 N·m (1.0 kg-m, 87 in-lb)
C Yes 62.0 N·m (6.3 kg-m, 46 ft-lb)
D No 39.2 N·m (4.0 kg-m, 29 ft-lb)
: Engine front
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EM-114
< DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
b. Install thrust bearings (1) to the both sides of the No. 3 journal
housing on cylinder block and main bearing cap.
 Install thrust bearings with the oil groove (E) facing crankshaft
arm (outside).
 Install thrust bearing with a projection on one end on cylinder block, and thrust bearing with a projection
at center on main bearing cap. Align each projection with mating notch.
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 caps.
 Ensure the oil holes on cylinder block and those on the corresponding bearing are aligned.
5. Install crankshaft to cylinder block.
 While turning crankshaft by hand, check that it turns smoothly.
6. Install main bearing caps.
 Main bearing caps are identified by identification mark cast on
them. For installation, face front mark (E) to front side.
NOTE:
Main bearing cap cannot be replaced as a single part, because it
is machined together with cylinder block.
7. Install main bearing beam.
 Install main bearing beam with front mark facing downward (oil pan side).
 Install main bearing beam with front mark facing front of the
engine.
A : No. 1
B : No. 2
C : No. 3
D : No. 4
F : Thrust bearing installation position
: Engine front
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A : Cylinder block side
D : Main bearing cap side
: Engine front
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A : No. 1
B : No. 2
C : No. 3
D : No. 4
: Engine front
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PBIC0881E

CYLINDER BLOCK
EM-115
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8. Install main bearing cap bolts in numerical order as shown in the
figure as follows:
a. Inspect the outer diameter of main bearing cap bolt. Refer to
EM-119, "
Inspection".
b. Apply new engine oil to threads and seat surfaces of main bear-
ing cap bolts.
c. Tighten main bearing cap bolts in several different steps.
d. Turn all main bearing cap bolts 90 degrees clockwise (angle tightening).
CAUTION:
Use the angle wrench [SST: KV10112100 (BT8653-A)] to
check tightening angle. Never make judgment by visual
inspection.
 After installing main bearing cap bolts, check that crankshaft
can be rotated smoothly by hand.
 Check the crankshaft end play. Refer to EM-119, "
Inspection".
9. Install piston to connecting rod as follows:
a. Using snap ring pliers, install new snap ring to the groove of piston rear side.
 Insert it fully into groove to install.
b. Install piston to connecting rod.
 Using an industrial drier or similar tool, heat piston until piston pin can be pushed in by hand without
excess force [approximately 60 to 70°C (140 to 158°F)]. From the front to the rear, insert piston pin into
piston and connecting rod.
 Assemble so that the front mark on the piston crown and the
cylinder number on connecting rod are positioned as shown in
the figure.
c. Install new snap ring to the groove of the piston front side.
 Insert it fully into groove to install.
 After installing, check that connecting rod moves smoothly.
10. Using a piston ring expander (commercial service tool) (A),
install piston rings.
CAUTION:
 When installing piston rings, be careful not to damage
piston.
 Be careful not to damage piston rings by expending them
excessively.
: Engine front
: 35.3 N·m (3.6 kg-m, 26 ft-lb)
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PBIC0921E
SEM838F
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EM-116
< DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
 If there is stamped mark on ring, mount it with marked side up.
NOTE:
If there is no stamp on ring, no specific orientation is required
for installation.
 Position each ring with the gap as shown in the figure referring
to the piston front mark (D).
 Check the piston rings side clearance. Refer to EM-119, "
Inspection".
11. Install connecting rod bearings to connecting rod and connecting rod bearing cap.
CAUTION:
Be careful not to drop connecting rod bearing, and to scratch the surface.
 Before installing connecting rod 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 connecting rod bearing stopper protru-
sion (B) with cutout (C) of connecting rod and connecting rod
bearing cap to install.
 Ensure the oil hole (A) on connecting rod and that on the cor-
responding bearing are aligned.
12. Install piston and connecting rod assembly to crankshaft.
 Position crankshaft pin corresponding to connecting rod to be installed onto the bottom dead center.
 Apply engine oil sufficiently to the cylinder bore, piston and crankshaft pin journal.
 Match the cylinder position with the cylinder number on connecting rod to install.
 Be sure that front mark on piston crown is facing front of engine.
 Using a piston ring compressor [SST: EM03470000 (J8037)]
(A) or suitable tool, install piston with the front mark on the pis-
ton crown facing the front of the engine.
CAUTION:
Be careful not to damage the cylinder wall and crankshaft
pin, resulting from an interference of the connecting rod big
end.Stamped mark: VQ25DE VQ35DE
To p r i n g ( A ) : R : —
Second ring (B) : R 2 : 2 R
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C : Top ring gap
E : Oil ring upper or lower rail gap (either of then)
F : Second ring and oil ring spacer gap
a : 90 degrees
b : 45 degrees
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