Oil Pump: Service and Repair
Preparatory Steps:
^ Remove the drive belt
^ Remove the radiator
^ Remove the fan clutch assembly
^ Remove the fan hub
^ Remove the oil fill
NOTE: Removal is easier if the crankshaft vibration damper is loosened before removing the belt.
Remove the crankshaft vibration damper.
Remove the front cover.
REMOVE THE LUBRICATING OIL PUMP
Remove the four mounting capscrews.
Remove the pump from the bore in the cylinder block.
CLEAN AND INSPECT
If the pump is to be inspected for reuse, follow these steps.
Visually inspect the lube pump gears for chips, cracks, or excessive wear.
Remove the back plate.
Mark "TOP" on the gerotor planetary.
NOTE: Mark with felt tip pen.
Remove the gerotor planetary. Inspect for excessive wear or damage.
Clean all parts in solvent and dry with compressed air.
Inspect the pump housing and gerotor drive for damage and excessive wear.
CAUTION: Be sure the gerotor planetary is installed in the original position.
NOTE: Chamfer must be on outside diameter, facing down.
Install the gerotor planetary.
Measure the tip clearance.
Maximum Clearance: 0.1778 mm [0.007 inch]
Measure the clearance of the gerotor drive/gerotor planetary to port plate.
Maximum Clearance: 0.127 mm [0.005 inch]
Measure the clearance of the gerotor planetary to the body bore.
Maximum Clearance: 0.381 mm [0.015 inch]
Measure the gears backlash.
Limits (Used Pump) 0.08 to 0.38 mm [0.003 to 0.015 inch]
Install the back plate.
INSTALLING THE LUBRICATING OIL PUMP
Lubricate the pump with clean engine oil.
NOTE: Filling the pump with oil during installation will help to prime the pump at engine start up.
CAUTION: Make sure the idler gear pin is installed in the locating bore In the cylinder block.
Install the pump.
Tighten the oil pump mounting mounting capscrews in the sequence shown.
Torque Value:
Step 1 - 5 N-m [44 in-lbs]
Step 2 - 24 N-m [18 ft-lbs]
NOTE: The back plate on the pump seats against the bottom of the bore in the cylinder block. When the pump is correctly installed, the flange on the pump will not touch the cylinder block.
NOTE: Be sure the gear backlash is correct if installing a new pump.
Measure gear backlash.
Backlash Limits
A-Idler to B-Idler to
Pump Drive Crankshaft
0.08 to 0.33mm 0.08 to 0.33mm
[0.003 to 0.013 inch] [0.003 to 0.013 inch]
NOTE: If the adjoining gear moves when you measure the backlash, the reading will be incorrect.
GEAR COVER - INSTALLATION
Lubricate the front gear train with clean engine oil.
CAUTION: The seal lip and the sealing surface on the crankshaft must be free from all oil residue to prevent seal leaks.
Thoroughly clean the front seal area of the crankshaft.
Install the front cover and gasket.
NOTE: Install the capscrews but do not tighten at this time.
Use the alignment/installation tool from the seal kit to align the cover to the crankshaft.
Tighten the front cover capscrews.
Torque Value: 24 N-m [18 ft-lbs]
Remove the alignment/installation tool.
CAUTION: Always use a seal pilot when you Install a seal.
Apply a bead of Loctite 277 to the outside diameter of the seal. Install the pilot from the seal kit onto the crankshaft. Install the seal onto the pilot and start into the front cover. Remove the pilot.
NOTE: To prevent damage to the seal carrier, hit the alignment/installation tool alternately at the 12, 3, 6 and 9 o'clock positions.
Use the alignment/installation tool and a plastic hammer to install the seal to the correct depth.
Install the front cover oil fill and seals.
Install oil fill tube bracket capscrew.
Torque Value: 43 N-m [32 ft-lbs]
Install the crankshaft vibration damper. Do not tighten the capscrews to the correct torque value at this time.
Raise the belt tensioner to install the belt.
Install the vibration damper capscrews.
Torque Value: 125 N-m [92 ft-lbs]
NOTE: Use an engine barring tool to keep the engine from rotating during torquing operation.