Xterra 4WD V6-3.3L SC (VG33ER) (2003)
Valve Guide Seal: Service and Repair
VALVE OIL SEAL
1. Remove the rocker cover.
2. Remove the camshaft and valve lifters with the valve lifter guide.
3. Remove the valve spring using Tool, as shown.
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The piston must be set at TDC to prevent the valve from falling into the piston bore.
4. Remove the valve oil seals.
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When removing the intake side valve oil seal, use Tool or a suitable tool.
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When removing the exhaust side valve oil seal, pull it out with a suitable tool.
5. Apply engine oil to the new valve oil seal and install it to the specified height as shown.
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Install the intake side valve oil seal using Tool, as shown.
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Install the exhaust side valve oil seal by setting it by hand.