Engine Mechanical (VK56DE): Adjustments Nissan Pathfinder III рестайлинг

Adjustment

There is no manual drive belt tension adjustment. The drive belt tension is automatically adjusted by the drive belt auto-tensioner.

Scheme 248

1. Remove the air duct and resonator assembly. Refer to " «REMOVAL AND INSTALLATION»(ref-519778-S06094199172012122900000) ".
2. Install Tool on drive belt auto-tensioner pulley bolt, move in the direction of arrow (loosening direction of tensioner) as shown. Tool number: - (J-46535) WARNING: Avoid placing hand in a location where pinching may occur if the holding tool accidentally comes off.
3. Remove the drive belt.

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 249

Scheme 250

1. Remove the camshaft. Refer to " «REMOVAL AND INSTALLATION»(ref-519778-S11623102152012122900000) ".
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: 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 " «STANDARD AND LIMIT»(ref-519778-S26232765652012122900000) ".
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. Refer to " «STANDARD AND LIMIT»(ref-519778-S26232765652012122900000) ".
9. After completing the repair, check the valve clearances again with the specifications for a warmed engine. Make sure the values are within specifications. Refer to " «STANDARD AND LIMIT»(ref-519778-S26232765652012122900000) ".

Scheme 251

1. Warm up the engine thoroughly. Then stop the engine.
2. Release the fuel pressure. Refer to " «FUEL PRESSURE CHECK»(ref-519792-S18456112622012122900000) ". CAUTION: If CONSULT is not used to release fuel pressure leave the fuel pump fuse disconnected until step 7 .
3. Remove the spark plug from each cylinder. Refer to " «REMOVAL AND INSTALLATION»(ref-519778-S20885270072012122900000) ".
4. Connect the engine tachometer (not required in use of CONSULT).
5. Install the compression tester with Tool into the spark plug hole. Tool number: EG15050500 (J-45402)
6. With the accelerator pedal fully depressed, turn the ignition switch to "START" for cranking. When the gauge pointer stabilizes, read the compression pressure and engine rpm. Perform these steps to check each cylinder. Unit: kPa (kg/cm 2 , psi)/rpm Standard Minimum Deference limit between cylinders 1, 520 (15.5, 220) / 200 1, 324 (13.5, 192) / 200 98 (1.0, 14) / 200 CAUTION: Always use a fully charged battery to obtain specified engine speed. If the engine speed is out of the specified range check the battery and recharge as necessary. Check the engine speed again with the battery properly charged. If some cylinders have low compression pressure, pour a small amount of engine oil into the spark plug hole of the cylinder to re-check it for compression. If the added engine oil improves the compression, piston rings may be worn out or damaged. Check the piston rings and replace if necessary If the compression pressure remains at a low level despite the addition of engine oil, the valves may be malfunctioning. Check the valves for damage. Replace the valve or valve seat accordingly. If two adjacent cylinders have low compression pressure and their compression remains low even after the addition of engine oil, cylinder head gaskets may be leaking. If the compression pressure is below the minimum value, check the valve clearances and parts associated with the combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head gasket). After repairing as necessary, measure the compression pressure again.
7. Install the components in the reverse order of removal.
8. Start the engine and confirm that it runs smoothly.
9. Perform trouble diagnosis. If DTC appears, erase it. Refer to " «DESCRIPTION»(ref-519792-S06421575992012122900000) ".