Overhaul
Engine Oil Pump Overhaul
Exploded View
NOTE: Refer to the Exploded View if needed during this procedure.
Oil Pump Removal
1. Turn the crankshaft pulley so its top dead center (TDC) mark (A) lines up with the pointer (B).
2. Remove the oil pan Engine Oil Pan Removal.
3. Loosely install the crankshaft pulley.
4. To hold the rear balancer shaft, insert a 6 mm long pin punch (Snap-on PPC108LA or equivalent) (A) into the maintenance hole in the balancer shaft holder and through the rear balancer shaft.
5. Turn the crankshaft counterclockwise to compress the oil pump chain auto-tensioner.
6. Align the holes on the lock (A) and the oil pump chain auto-tensioner (B), then insert a 1.2 mm (3/64 in) diameter pin (C) into the holes. Turn the crankshaft clockwise to secure the pin.
7. Remove the oil pump chain auto-tensioner.
8. Loosen the oil pump sprocket mounting bolt.
9. Remove the oil pump sprocket (A), then remove the oil pump (B).
Oil Pump Inspection
1. Remove the pump housing.
2. Check the inner-to-outer rotor radial clearance between the inner rotor (A) and the outer rotor (B). If the inner-to-outer rotor radial clearance exceeds the service limit, replace the oil pump.
3. Check the pump housing-to-rotor axial clearance between the rotor (A) and housing (B). If the pump housing-to-rotor axial clearance exceeds the service limit, replace the oil pump.
4. Check the pump housing-to-outer rotor radial clearance between the outer rotor (A) and the housing (B). If the pump housing-to-outer rotor radial clearance exceeds the service limit, replace the oil pump.
Balancer Shaft Inspection
1. Seat the balancer shaft by pushing it away from the oil pump sprocket end of the oil pump.
2. Zero the dial indicator against the end of the balancer shaft, then push the balancer shaft back and forth and read the end play.
3. Remove the pump housing.
4. Remove the upper balancer shaft holder (with bearings) (A), then remove the front balancer shaft (B) and the rear balancer shaft (C).
5. Measure the inner diameter of the No. 1 bearing for the front balancer shaft hole and the rear balancer shaft hole.
Front
Rear
6. Measure the diameters of the No. 1 journals on the front balancer shaft and rear the balancer shaft.
Front
Rear
7. Clean both balancer shaft No. 2 journals and bearing halves with a clean shop towel.
8. Place one strip of Plastigage across each No. 2 journal.
9. Reinstall the bearings and upper balancer shaft holder, then torque the bolts.
NOTE: Do not rotate the balancer shafts during inspection.
10. Remove the upper balancer shaft holder and the bearings again, and measure the widest part with the Plastigage. If the balancer shaft No. 2 journal oil clearance is out-of-tolerance, install new bearings, and recheck. If it is still out-of-tolerance, replace the balancer shafts.
11. Align the punch mark (A) on the rear balancer shaft in the center of the two punch marks (B) on the front balancer shaft, then install the balancer shafts on the lower balancer shaft holder.
12. Apply new engine oil to the threads of the 8 mm bolts (A).
13. Install the upper balancer shaft holder (B).
14. Install the pump housing.
Oil Pump Installation
1. Make sure the No. 1 piston top dead center (TDC) mark (A) lines up with the pointer (B).
2. Align the dowel pin (A) on the rear balancer shaft with the mark (B) on the oil pump.
3. To hold the rear balancer shaft, insert a 6 mm long pin punch (Snap-on PPC108LA or equivalent) (A) into the maintenance hole in the lower balancer shaft holder and through the rear balancer shaft.
4. Apply new engine oil to the threads of the 10 x 1.25 mm oil pump mounting bolts (A) and the oil pump sprocket mounting bolt (B).
5. Loosely install the oil pump (C), then install the oil pump sprocket (D).
6. Remove the 6 mm long pin punch (Snap-on PPC108LA or equivalent) (E).
7. Tighten the oil pump mounting bolts.
8. Install the oil pump chain auto-tensioner.
9. Remove the pin (A) from the oil pump chain auto-tensioner.
10. Install the oil pan Engine Oil Pan Installation.