Check all oil holes for clogging. Clean the holes if necessary.

Check the counter balance shaft front bearing for wear, damage and seizure. If there is anything wrong with the bearing, replace the front case.

Check the front case for cracks and other damage.

Replace a cracked or damaged front case.

Check the journals for wear or seizure.

If excessive wear or seizure is evident, check the bearing carefully.

If necessary, replace the counter balance shaft bearing or the shaft itself.

Check the oil seal lip for wear and damage. Replace the oil seal if necessary.

Check the oil seal lip for deterioration. Replace the oil seal if necessary.

Check the continuity between the terminal and the body with an ohmmeter.

If there is no continuity, replace the oil pressure switch.

Check the continuity between the terminal and the body when the fine wire is pushed. If there is continuity even when the fine wire is pushed,replace the switch.

If there is no continuity when a 50 kPa (7 psi) vacuum is applied through the oil hole, the switch is operating properly. Check for an air leak. Ifair leaks, the diaphragm is broken. Replace the switch.

Assemble the oil pump gear to the front case and rotate it to verfy smooth rotation with no looseness.

Make sure that there is no ridge wear on the contact surface between the front case and the gear surface of the oil pump cover.

Install the drive and driven gears to the front case. Measure the tip clearance of the gears.

Check the side clearance.