Engine Mechanical: Adjustments Nissan Armada I

TENSION ADJUSTMENT

Belt tensioning is not necessary, as it is automatically adjusted by the auto tensioner.

Scheme 7

1. Remove the air duct and resonator assembly. Refer to «REMOVAL»(ref-233240-S11402286492006052500000).
2. Install Tool on auto tensioner pulley bolt, move in the direction of arrow (loosening direction of tensioner) (Scheme 7) Tool number: - (J-46535) CAUTION: Avoid placing hand in a location where pinching may occur if the holding tool accidentally comes off.
3. Remove the drive belt.

ADJUSTMENT

Note. Perform adjustment depending on the selected head thickness of the valve lifter. The specified valve lifter thickness is the dimension at normal temperatures. Ignore dimensional differences caused by temperature. Use the specifications for hot engine condition to adjust.

Scheme 8

Scheme 9

1. Remove the camshaft. Refer to «REMOVAL»(ref-233240-S10213585022006052500000) .
2. Remove the valve lifters at the locations that are out of specification.
3. Measure the center thickness of the removed valve lifters using suitable tool.
4. Use the equation below to calculate the valve lifter thickness for replacement. Valve lifter thickness calculation: Thickness of replacement valve lifter = t1+ (C1 - C2) t1 = Thickness of removed valve lifter C1 = Measured valve clearance C2 = Standard valve clearance: Intake: 0.36 mm (0.0142 in)* Exhaust: 0.37 mm (0.0146 in)* *: Approximately 80°C (176°F) Thickness of a new valve lifter can be identified by stamp marks on the reverse side (inside the cylinder). Stamp mark N788 indicates 7.88 mm (0.3102 in) in thickness. Available thickness of valve lifter: 25 sizes with range 7.88 to 8.36 mm (0.3102 to 0.3291 in) in steps of 0.02 mm (0.0008 in) (when manufactured at factory). Refer to «AVAILABLE VALVE LIFTER»(ref-233240-S29067233422006052500000) .
5. Install the selected valve lifter.
6. Install the camshaft.
7. Manually turn the crankshaft pulley a few turns.
8. Make sure the valve clearances for a cold engine are within specifications by referring to the specified values.
9. After completing the repair, check the valve clearances again with the specifications for a warmed engine. Make sure the values are within specifications. Valve clearance standard: Hot* Intake: 0.304-0.416 mm (0.012-0.016 in) Exhaust: 0.308-0.432 mm (0.012-0.017 in) Cold Intake: 0.26-0.34 mm (0.010-0.013 in) Exhaust: 0.29-0.37 mm (0.011-0.015 in) *: Approximately 80°C (176°F)

Scheme 10

Scheme 11

1. Remove the camshaft relating to the valve oil seal to be removed. Refer to «REMOVAL AND INSTALLATION»(ref-233240-S10213585022006052500000) .
2. Remove the valve lifters. Refer to «REMOVAL AND INSTALLATION»(ref-233240-S10213585022006052500000) . Correctly identify the location where each part is removed from. Keep parts organized to avoid mixing them up.
3. Turn the crankshaft until the cylinder requiring new oil seals is at TDC. This will prevent the valve from dropping into the cylinder.
4. Remove the valve collet using Tool. Tool number: KV10116200 (J-26336-B) : KV10115900 (J-26336-20) : KV10109220 (-) CAUTION: Do not damage the valve lifter holes.
5. Remove the valve spring retainer and valve spring. CAUTION: Do not remove the valve spring seat from the valve spring.
6. Remove the valve oil seal using Tool. Tool number: KV10107902 (J-38959)