Check the front case for cracks or damage. Replace as necessary.
Check the front oil seal for worn or damaged lips. Replace if defective.
Check the oil pan for failure, damage or cracks. Replace if defective.
Check the oil screen for failure, damage and cracks and replace if defective.
Check the surfaces contacting the gears for damage or wear.
Check the gear tooth surfaces for wear or damage.
Measure the clearance between outer gear and front case.
Body clearance : 0.12 ~ 0.185 mm (0.0047 ~ 0.0073 in.)
Tip clearance : 0.025 ~ 0.069 mm (0.0010 ~ 0.0027 in.)
Side clearance
Outer gear : 0.04 ~ 0.09 mm (0.0016 ~ 0.0035 in.)
Inner gear : 0.04 ~ 0.085 mm (0.0016 ~ 0.0033 in.)
Check the tip clearance on the pump roter.
Check sliding condition of the relief valve inserted in the front case.
Inspect for distorted or broken relief valve spring.
Standard value
Free height : 46.6 mm (1.8346 in.)
Load : 6.1 kg/40.1 mm (13.42 lb/1.578 in.)
Use an ohmmeter to check the continuity between the terminal and the body. 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 air leaks. If air does leak, the diaphragm is broken. Replace the switch.
