| Fig. 1: Checking the inner rotor-to-outer rotor clearance
for the 1,586cc, 1,796cc, 1,970cc and 2,209cc engines
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| Fig. 2: Inner rotor-to-outer rotor tally marks used for
alignment when assembling the oil pump
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Make this check using a dial indicator mounted on a magnet base. Bear the indicator on the drive gear. Clearance should not exceed 0.10mm (0.003937 in.). If it does, replace the pump.
Using a feeler gauge, check between the lobes of the rotors. Standard clearance should be 0.05–0.15mm (0.00196–0.00591 in.). If the clearance is greater than 0.25mm (0.00984 in.), replace both rotors.
Insert a feeler gauge between the outer rotor and the pump body. Standard clearance is 0.15–0.25mm (0.00591–0.00984 in.). If clearance exceeds 0.30mm (0.0118 in.), replace the rotor or body.
Place a straightedge across the pump body and measure the clearance between the rotor and the straightedge with a feeler gauge. Then, place the straightedge across the pump cover and, with a feeler gauge, measure between the straightedge and the cover center. If the total of these two measurements exceeds 0.15mm (0.0059 in.), the condition may be corrected by grinding the cover or replacing the cover or pump body.
| Fig. 3: Inner (left) and outer (right) gear tooth tip-to-crescent
clearance measurements on the 1,998cc engine oil pump
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| Fig. 4: 1,998cc engine oil pump side clearance measurement
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| Fig. 5: Outer gear-to-pump body clearance measurement
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NOTE: The crescent referred to in these procedures is the crescent-shaped slinger between the inner and outer pump gears.
Check this clearance with a feeler gauge. If the clearance exceeds 0.33mm (0.01299 in.), replace the gear.
Check this clearance with a feeler gauge. If the clearance exceeds 0.40mm (0.01575 in.), replace the gear.
Lay a straightedge across the pump body and, using a feeler gauge, measure between the gear faces and straightedge. If the clearance exceeds 0.10mm (0.003937 in.), replace the pump.
Insert a feeler gauge between the outer gear and the pump body. If the clearance exceeds 0.20mm (0.00787 in.), replace the gear or pump body.
