Opel Corsa B 1993–2000 Service and Repair Manual: Oil pump - removal and refitting


1. Remove the sump.

2. Undo the two socket-headed bolts and withdraw the pump from the crankcase (see illustrations).

OHV engine
Undo the two socket-headed bolts (arrowed) . . .

OHV engine
. . . and remove the oil pump


3. Refitting the pump is the reverse sequence to removal, but engage the pump shaft in the distributor driveshaft slot, and tighten the retaining bolts to the specified torque.

Oil pump - overhaul

1. Remove the oil pump.

2. Undo the two pump cover bolts and lift off the cover and oil pick-up tube. Remove the cover gasket.

3. Take out the driving gear and driven gear (see illustrations).

OHV engine
Removing the oil pump driving gear . . .

OHV engine
. . . and the driven gear

4. Undo the large nut on the side of the housing and remove the sealing washer and oil pressure relief spring and ball valve (see illustration).

OHV engine
Oil pump and pressure relief valve components

5. Clean all the parts in paraffin and dry with a lint-free cloth.

6. Inspect the pump gears, housing, cover and relief valve ball for scoring, scuff marks or other signs of wear and renew the pump if these signs are evident.

7. If the pump condition is satisfactory, check the pump clearances as follows.

8. Using a feeler blade, check the backlash between the gear teeth. Place a straight-edge across the top edge of the gears and check their projection. If any of the clearances exceeds the tolerances given in the Specifications, renew the pump (see illustration).

OHV engine
Check the pump gear teeth backlash

9. If the clearances are satisfactory, refit the relief valve assembly and assemble the pump gears. Fill the pump with oil and refit the cover using a new gasket. Tighten the cover securing bolts and refit the pump.

    Sump - removal and refitting
    Removal 1. Jack up the front of the car and securely support it on axle stands. 2. Drain the engine oil into a suitable container and refit the plug after draining. 3. Undo the bolts securing the f ...

    Timing gear components - removal and refitting
    Removal 1. For greater access remove the front right-hand wheel trim and slacken the wheel bolts. Jack up the front of the car, support it securely on axle stands and remove the roadwheel. 2. Und ...

    See also:

    Opel Corsa B 1993–2000 Service and Repair Manual. Ignition system - testing
    1. By far the majority of breakdown and running troubles are caused by faults in the ignition system either in the low tension or high tension circuits. 2. There are two main symptoms indicating ...