Overhaul

Engine Oil Pump Overhaul

Exploded View





Oil Pump Removal

1. Turn the crankshaft pulley so its top dead center (TDC) mark (A) lines up with the pointer (B).
NOTE: The other pointer (C) is not used.

2. Remove the oil pan. Engine Oil Pan Removal






3. To hold the rear balancer shaft, insert a 6 mm long pin punch (A) (Snap-on PPC108LA or equivalent) into the maintenance hole in the balancer shaft holder and through the rear balancer shaft.

4. Turn the crankshaft counterclockwise to compress the oil pump chain auto-tensioner.






5. Align the holes on the lock (A) and the oil pump chain auto-tensioner (B), then insert a 3.0 mm (0.12 in) diameter pin (C) into the holes. Turn the crankshaft clockwise to secure the pin.






6. Use a transmission jack to lift the transmission 30-40 mm (1.2-1.6 in), then remove the oil pump chain auto-tensioner.






7. Loosen the oil pump sprocket mounting bolt.






8. Remove the oil pump sprocket (A), then remove the oil pump (B).






Oil Pump Inspection

1. Remove the pump housing.






2. Align the tip of the inner rotor tooth (A) with the mark (B) on the outer rotor, then check the inner-to-outer rotor radial clearance between the inner rotor and the outer rotor. 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 the pump 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 pump 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) and baffle plates (B), then remove the front balancer shaft (C) and the rear balancer shaft (D).






5. Measure the inner diameter of the No. 1 bearing for the front balancer shaft hole and the No. 2 bearing for the rear balancer shaft hole.





Front





Rear





6. Measure the diameters of the No. 1 journal on the front balancer shaft and the No. 2 journal on the rear balancer shaft.





7. Clean the front balancer shaft No. 2 journal, the rear balancer shaft No. 3 journal, and the bearing halves with a clean shop towel, then place both balancer shafts into the balancer holder.

8. Place one strip of plastigage across the No. 2 and No. 3 journals.

9. Reinstall the bearings and the upper balancer shaft holder, then tighten the bolts.
NOTE: Do not rotate the balancer shafts during inspection.





Front





Rear





10. Remove the upper balancer shaft holder and the bearings again, and measure the widest part with the plastigage. If balancer shaft No. 2 and/or No. 3 journals 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 on the rear balancer shaft in the center of the two punch marks 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) and the baffle plates (C).






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).
NOTE: The other pointer (C) is not used.






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 (A) (Snap-on PPC108LA or equivalent) into the maintenance hole in the balancer shaft holder and through the rear balancer shaft.






4. Apply new engine oil to the threads of the oil pump mounting bolts (A) and oil pump sprocket mounting bolt (B), then loosely install the oil pump (C) with a new O-ring (D), then install the oil pump sprocket (E).

5. Tighten the oil pump mounting bolts and the oil pump sprocket mounting bolt.

6. Remove the 6 mm pin punch (F).






7. Install the oil pump chain auto-tensioner.
NOTE: If the 3.0 mm (0.12 in) diameter pin come off the auto-tensioner. Compress the auto-tensioner. Removal and Replacement






8. Remove the 3.0 mm (0.12 in) diameter pin (A) from the oil pump chain auto-tensioner.

9. Install the oil pan. Engine Oil Pan Installation