ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 007-031   Lubricating Oil Pump

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Disconnect the batteries. Refer to Procedure 013-009 in Section 13.
• Install the belt guard, if equipped. Refer to Procedure 008-001 in Section 8.
• Remove the drive belt. Refer to Procedure 008-002 in Section 8.
• On marine engines, remove the belt tensioner. Refer to Procedure 008-080 in Section 8.
• Remove the vibration damper, if installed. Refer to Procedure 001-051 if installed, in Section 1.
• Remove the vibration damper, if installed. Refer to Procedure 001-052 if installed, in Section 1.
• Remove the front cover. Refer to Procedure 001-031 in Section 1.

Remove the four mounting capscrews.

Remove the pump from the bore in the cylinder block.

If the lubricating oil pump is to be inspected for reuse, follow these steps.

Inspect the lubricating oil pump gears for chips, cracks, or excessive wear.

Remove the back plate.

NOTE: The ISC, QSC8.3, ISL, and QSL9 lubricating oil pump uses a large diameter 5/6 rotor set. The graphics in this manual illustrate a 4/5 rotor set.

Mark TOP on the gerotor planetary.

Remove the gerotor planetary.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Some solvents are flammable and toxic. Read the manufacturer’s instructions before using.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Clean all parts in solvent.

Dry with compressed air.

Inspect the lubricating oil pump housing, gerotor drive, and gerotor for damage and excessive wear.

CAUTION  Make sure that the gerotor planetary is installed in the original position.

Install the gerotor planetary.

Measure the tip clearance.

Tip Clearance

Replace the lubricating oil pump if the tip clearance is out of specification.

Measure the clearance of the gerotor drive/gerotor planetary to port plate.

Gerotor Drive/Gerotor Planetary to Port Plate Clearance

Replace the lubricating oil pump if the geroter drive/geroter planetary to port plate clearance is out of specification.

Measure the clearance of the gerotor planetary to the body bore.

Gerotor Planetary to Body Bore Clearance

Replace the lubricating oil pump if the geroter planetary to body bore clearance is out of specification.

Measure the backlash.

Lubricating Oil Pump Gears Backlash Limits (Used Pump)

NOTE: Hold the adjoining gears to keep them from moving when checking backlash or else the reading will be the total of both gears.

Replace the lubricating oil pump if the gear backlash is out of specification.

Install the back plate.

CAUTION  Failure to fill the pump with oil during installation can result in a failure of the lubricating oil pump to prime at initial engine start-up, resulting in severe engine damage.

Lubricate the lubricating oil pump with clean 15W-40 engine oil.

CAUTION  Make sure the idler gear pin is installed in the locating bore in the cylinder block.

Install the lubricating oil pump.

Tighten the capscrews in a crisscross pattern, starting with the upper right capscrew.

NOTE: Be sure the gear backlash is correct if installing a new lubricating oil pump.

Measure the gear backlash.

Lubricating Oil Pump Gears Backlash Limits (Installed)

NOTE: If the adjoining gear moves when you measure the backlash, the reading will be incorrect.

Lubricate the front gear train with clean 15W-40 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.

NOTE: Always replace the front seal when removing and installing the front cover. Refer to Procedure 001-031 in Section 1.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Install the front cover. Refer to Procedure 001-031 in Section 1.
• Install the vibration damper, if installed. Refer to Procedure 001-051 if installed, in Section 1.
• Install the vibration damper, if installed.Refer to Procedure 001-052 if installed, in Section 1.
• On marine engines, install the belt tensioner. Refer to Procedure 008-080 in Section 8.
• Install the drive belt. Refer to Procedure 008-002 in Section 8.
• Install the belt guard, if equipped. Refer to Procedure 008-001 in Section 8.
• Connect the batteries. Refer to Procedure 013-009 in Section 13.
• Operate the engine and check for leaks.