Nissan Frontier. Manual — part 751

CAMSHAFT

EM-193

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Removal and Installation

INFOID:0000000009478137

REMOVAL

1. Release the fuel pressure. Refer to

EC-959, "Fuel Pressure Check"

.

2. Disconnect the battery negative terminal. Refer to

PG-83, "Removal and Installation"

.

3. Remove front wheels and tires. Refer to

WT-48, "Adjustment"

.

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"

and

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

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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

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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

EM-247,

"Standard and Limit"

.

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