Nissan Frontier. Instruction — part 751
CAMSHAFT
EM-193
< REMOVAL AND INSTALLATION >
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Removal and Installation
INFOID:0000000009478137
REMOVAL
1. Release the fuel pressure. Refer to
.
2. Disconnect the battery negative terminal. Refer to
PG-83, "Removal and Installation"
3. Remove front wheels and tires. Refer to
4. Remove front fender protectors. Refer to
EXT-27, "Removal and Installation of Front Fender Protector"
5. Remove intake manifold collector. Refer to
EM-142, "Removal and Installation"
6. Remove rocker covers. Refer to
EM-158, "Removal and Installation"
.
7. Remove front timing chain case, camshaft sprockets, timing chains and rear timing chain case. Refer to
EM-176, "Removal and Installation"
EM-187, "Removal and Installation"
8. Remove camshaft position sensor (PHASE) (right and left
banks) from cylinder head back side.
CAUTION:
• Handle carefully to avoid dropping and shocks.
• Do not disassemble.
• Do not allow metal powder to adhere to magnetic part at
sensor tip.
• Do not place sensors in a location where they are
exposed to magnetism.
9. Remove intake valve timing control solenoid valves.
• Discard intake valve timing control solenoid valve gaskets and
use new gaskets for installation.
10. Remove camshaft brackets.
• Mark camshafts, camshaft brackets and bolts so they are placed in the same position and direction for
installation.
KBIA1046E
WBIA0169E
EM-194
< REMOVAL AND INSTALLATION >
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CAMSHAFT
• Equally loosen camshaft bracket bolts in several steps in
reverse order as shown.
11. Remove camshafts.
12. Remove valve lifters, if necessary.
• Identify installation positions, and store them without mixing them up.
13. Remove timing chain tensioner (secondary) from cylinder head.
• Remove timing chain tensioner (secondary) with its stopper
pin attached.
NOTE:
Stopper pin was attached when timing chain (secondary) was
removed.
INSPECTION AFTER REMOVAL
Camshaft Runout
1. Put V-block on precise flat table, and support No. 2 and 4 journal
of camshaft.
CAUTION:
Do not support journal No. 1 (on the side of camshaft
sprocket) because it has a different diameter from the other
three locations.
2. Set dial indicator vertically to No. 3 journal.
3. Turn camshaft to one direction with hands, and measure the
camshaft runout on dial indicator. (Total indicator reading)
4. If it exceeds the limit, replace camshaft.
Camshaft Cam Height
PBIC2050E
PBIC2111E
Standard
: Less than 0.02 mm (0.0008 in)
Limit
: 0.05 mm (0.0020 in)
PBIC0929E
CAMSHAFT
EM-195
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1. Measure the camshaft cam height with micrometer.
2. If wear exceeds the limit, replace camshaft.
Camshaft Journal Oil Clearance
CAMSHAFT JOURNAL DIAMETER
• Measure the outer diameter of camshaft journal with micrometer.
CAMSHAFT BRACKET INNER DIAMETER
• Tighten camshaft bracket bolt with the specified torque.
• Measure the inner diameter “A” of camshaft bracket with bore
gauge.
CAMSHAFT JOURNAL OIL CLEARANCE
• (Oil clearance) = (Camshaft bracket inner diameter) – (Camshaft journal diameter).
• If the calculated value exceeds the limit, replace either or both camshaft and cylinder head.
NOTE:
Camshaft bracket cannot be replaced as a single part, because it is machined together with cylinder head.
Replace whole cylinder head assembly.
Camshaft End Play
Standard:
Intake
: 45.465 - 45.655 mm (1.7900 - 1.7974 in)
Exhaust : 45.075 - 45.265 mm (1.7746 - 1.7821 in)
Limit:
Intake
: 45.265 mm (1.7821 in)
Exhaust : 44.875 mm (1.7667 in)
EMQ0072D
Standard:
No. 1
: 25.935 - 25.955 mm (1.0211 - 1.0218 in)
No. 2, 3, 4
: 23.445 - 23.465 mm (0.9230 - 0.9238 in)
PBIC0040E
Standard:
No. 1
: 26.000 - 26.021 mm (1.0236 - 1.0244 in)
No. 2, 3, 4
: 23.500 - 23.521 mm (0.9252 - 0.9260 in)
PBIC1645E
Standard:
No. 1
: 0.045 - 0.086 mm (0.0018 - 0.0034 in)
No. 2, 3, 4 : 0.035 - 0.076 mm (0.0014 - 0.0030 in)
Limit
: 0.15 mm (0.0059 in)
EM-196
< REMOVAL AND INSTALLATION >
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CAMSHAFT
• Install dial indicator in thrust direction on front end of camshaft.
Measure the end play of dial indicator when camshaft is moved for-
ward/backward (in direction to axis).
• Measure the following parts if out of the limit.
- Dimension “A” for camshaft No. 1 journal
- Dimension “B” for cylinder head No. 1 journal bearing
• Following the standards above, replace camshaft and/or cylinder
head.
Camshaft Sprocket Runout
1. Put V-block on precise flat table, and support No. 2 and 4 journal of camshaft.
CAUTION:
Do not support journal No. 1 (on the side of camshaft sprocket) because it has a different diameter
from the other three locations.
2. Measure the camshaft sprocket runout with dial indicator. (Total
indicator reading)
• If it exceeds the limit, replace camshaft sprocket.
Valve Lifter
Check if surface of valve lifter has any wear or cracks.
• If anything above is found, replace valve lifter. Refer to
Valve Lifter Clearance
VALVE LIFTER OUTER DIAMETER
Standard
: 0.115 - 0.188 mm (0.0045 - 0.0074 in)
Limit
: 0.24 mm (0.0094 in)
SEM864E
Standard
: 27.500 - 27.548 mm (1.0827 - 1.0846 in)
Standard
: 27.360 - 27.385 mm (1.0772 - 1.0781 in)
KBIA2404J
Limit
: 0.15 mm (0.0059 in)
PBIC0930E
KBIA0182E
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