Frontier 2WD V6-3.3L (VG33E) (2003)
9. Disconnect the fresh-air intake tube from the rocker cover.
10. Disconnect the water hose from the thermostat housing.
Timing Marks
11. Set the No. 1 piston at TDC on the compression stroke by rotating the crankshaft.
12. Remove the crankshaft pulley bolt.
13. Remove the crankshaft pulley using a suitable puller.
14. Remove the front upper and lower timing belt covers.
15. Align the timing belt sprockets to the timing marks on the engine.
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Align the punchmark on the LH camshaft sprocket with the punchmark on the timing belt rear cover.
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Align the punchmark on the crankshaft sprocket with the alignment mark on the oil pump housing.