N14 Base Engine Troubleshooting and Repair Manual – 007-031   Lubricating Oil Pump

Remove

TOC

Remove the demand flow and cooling (DFC) signal line between the cylinder block main oil rifle and the lubricating oil pump.

Remove the capscrews and the lubricating oil transfer tube. Refer to Procedure

007-040-002.

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Remove the five capscrews which hold the lubricating oil pump to the cylinder block.

 CAUTION 

Do not pry on the lubricating oil pump mounting flange.

Remove the lubricating oil pump from the cylinder block gear flange. Discard the gasket.

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Clean

TOC

 CAUTION 

Do not allow dirt or gasket material to enter the oil passages. Bearing damage can result.

Clean the lubricating oil pump and the cylinder block gasket surfaces.

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 WARNING 

Carefully remove the capscrew (1). The pressure regulator spring is under compression.

Remove the lubricating oil pressure regulator. Refer to Procedure

007-029-002.

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Remove the lubricating oil pump front cover and the lubricating oil pump driven gear.

Remove the 7/16-20 UNF straight thread with o-ring seal adapter and the power steering pump mounting flange cover from the lubricating oil pump cover.

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Clean the gasket material from the lubricating oil pump body and cover.

Use an acetylene torch tip cleaner or equivalent that is 1.0 mm [0.040-inch] or less in diameter to clean the orifice.

NOTE: The diameter of the orifice is 1.0 mm [0.040-inch]. Do

not
attempt to drill out the orifice or use a larger diameter wire to clean the orifice.

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 CAUTION 

Wear safety goggles when using an air solvent gun to prevent possible eye injury.

Use solvent and an air solvent gun to clean the signal line, the lubricating oil pump cover, and the body. Hold the driven gear off of the lubricating oil pump body when cleaning the gear bore area.

Dry with compressed air.

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Inspect for Reuse

TOC

Inspect the gears for freedom of rotation and cracked or broken teeth.

Visually inspect the lubricating oil pump gears for cracked or broken teeth. Wear on the gear teeth face has

not
been detrimental to the lubricating oil pump life or low oil pressure. Wear is acceptable if backlash is within specifications.

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Lock the idler gear to keep it from rotating by applying a clamp to the gear and the pump body as shown in the accompanying illustration.

 
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With the gear clamped and the dial indicator in place as shown in the illustration, rotate the external drive gear

clockwise
and then

counterclockwise
to measure and record the backlash in the pumping gears on the dial indicator.

Pumping Gear Backlash
mm in
0.33 MIN 0.013
0.89 MAX 0.035
 
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Use depth calipers or a dial indicator to measure the drive shaft end clearance in two locations 90 degrees apart.

Drive Shaft End Clearance
mm in
0.051 MIN 0.002
0.203 MAX 0.008

Rebuild the lubricating oil pump if the driveshaft end clearance does

not
meet specifications. Refer to the Engine Shop Manual.

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Install

TOC

Use 15W-40 oil to lubricate the shaft, the gears, and the bushings. Also, lubricate the area between the driven gear and the body.

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Install the driven gear onto the shaft.

Install a new gasket on the pump body and install the cover.

Install the capscrews and tighten.

Torque Value:  27  n.m  [20 ft-lb]

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Check the gears for freedom of rotation in the pump.

Install the lubricating oil pressure regulator. Refer to Procedure

007-029-026.

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Install the power steering pump mounting flange gasket and cover. Tighten the capscrews.

Torque Value:  27  n.m  [20 ft-lb]

Install a new gasket onto the mounting trunion of the lubricating oil pump.

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Install the lubricating oil pump into the mounting hole in the cylinder block gear flange.

Install the five mounting capscrews. Tighten the capscrews.

Torque Value:  54  n.m  [40 ft-lb]

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Install the DFC signal line. Tighten the signal line fittings.

Torque Value:  9  n.m  [80 in-lb]

Install the lubricating oil transfer tube. Refer to Procedure

007-040-026.

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Confirm that the oil level in the oil pan is to the full mark.

Operate the engine until the water temperature reaches 82°C [180°F]. Check the oil pressure and check for oil leaks.

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Last Modified:  12-May-2003