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    Isuzu Cars and Trucks 1981-1991

    Oil Pump

    Print

    REMOVAL AND INSTALLATION
    G180Z and G200Z Engine

    The oil pump is located in the oil pan and is attached to the front cover.

    1. Disconnect the negative battery cable. Raise and safely support the vehicle.
    2.  
    3. Rotate the crankshaft to position the No. 1 or No. 4 cylinder at the TDC of its compression stroke.
    4.  
    5. Drain the crankcase and remove the oil pan as outlined in this Section.
    6.  


    CAUTION
    The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

    1. Remove the oil pick-up-to-engine bolt and the oil pick-up tube from the oil pump.
    2.  
    3. Remove the oil pump-to-front cover bolts and the oil pump.
    4.  



    Click image to see an enlarged view

    Fig. Aligning oil pump drive and driven rotors G180Z and G200Z engines



    Click image to see an enlarged view

    Fig. Installing the oil pump



    Click image to see an enlarged view

    Fig. Oil pump shaft alignment G180Z and G200Z engines

    To install:

    1. Turn the punch mark on the oil pump drive gear toward the oil filter and align the center of the oil pump's drive gear with the mark on the oil pump case.
    2.  
    3. Insert the oil pump into the front cover.
    4.  


    NOTE
    When installing the oil pump, turn the oil pump shaft so the drive gear engages with the drive pinion. When installed, the punch mark on the drive gear should be facing the main bearings and the shaft tang must be engaged with the distributor shaft.

    1. Install the oil pump and pump-to-front cover bolts.
    2.  
    3. Remove the oil pick-up-to-engine bolt and the oil pick-up tube from the oil pump.
    4.  
    5. Install the oil pan as outlined in this Section.
    6.  
    7. Connect the negative battery cable. Lower the vehicle.
    8.  
    9. Refill the crankcase. Connect the negative battery cable.
    10.  
    11. Start the engine and check for leaks.
    12.  

    4XC1-U, 4XC1-T, 4XE1 Engine

    The oil pump is located in the front cover assembly. The engine may have to be removed to service the oil pump.

    1. Disconnect the negative battery cable.
    2.  
    3. Drain the engine oil into a suitable container.
    4.  


    CAUTION
    The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

    1. Rotate the crankshaft to the No. 4 cylinder is at top dead center on the compression stroke and align the timing marks.
    2.  
    3. Remove the accessories from the front of the engine.
    4.  
    5. Remove the crankshaft pulley and damper.
    6.  
    7. Remove the timing belt cover and belt.
    8.  
    9. Remove the front cover/oil pump retaining bolts and cover.
    10.  



    Click image to see an enlarged view

    Fig. Oil pump 4XC1 and 4XE1 engines

    To install:

    1. Clean all gasket mating surfaces with a scraper.
    2.  
    3. Make sure the pressure release valve is functioning properly.
    4.  
    5. Install the front cover/oil pump, gasket and retaining bolts.
    6.  
    7. Install the timing belt and cover.
    8.  
    9. Install the crankshaft pulley and damper.
    10.  
    11. Install the accessories to the front of the engine.
    12.  
    13. Install the engine, if removed.
    14.  
    15. Refill the engine with engine oil.
    16.  
    17. Connect the negative (-) battery cable, start the engine and check for leaks.
    18.  

    4ZC1-T, 4ZD1 and 4ZE1 Engine

    The oil pump is attached to the front, lower right side of the engine and is driven by the timing belt.

    1. Remove the upper and lower timing belt covers.
    2.  
    3. Remove the timing belt from the crankshaft and oil pump sprockets.
    4.  
    5. Remove the oil pump sprocket-to-oil pump nut and the sprocket from the oil pump.
    6.  
    7. Using a 6mm Allen wrench, remove the oil pump-to-engine bolts and the oil pump.
    8.  

    To install:

    1. Using petroleum jelly, pack the oil pump.
    2.  
    3. Using a new O-ring, install the oil pump and torque the bolts to 10 and 1917 ft. lbs. (14 and 1922 Nm).
    4.  
    5. Install the sprocket to the oil pump and torque the nut to 48 and 1962 ft. lbs. (63 and 1986 Nm).
    6.  
    7. Align the timing marks on the camshaft and crankshaft sprockets and install the timing belt.
    8.  
    9. Fill the engine with oil, start the engine and check for leaks.
    10.  



    Click image to see an enlarged view

    Fig. Oil pump assembly 4ZD1 and 4ZE1 engines

    V6 Engine

    The oil pump is attached to the cylinder block and is located in the oil pan.

    1. Disconnect the negative battery cable. Raise and safely support the vehicle.
    2.  
    3. Drain the crankcase. Remove the oil pan as outlined in this Section.
    4.  


    CAUTION
    The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

    1. Remove the oil pump-to-engine bolts and the oil pump.
    2.  



    Click image to see an enlarged view

    Fig. Oil pump assembly V6 engines

    To install:

    1. Align the oil pump shaft with the hexagon socket and install the pump. Torque the oil pump-to-engine bolts to 30 ft. lbs. (41 Nm).
    2.  
    3. Install the oil pan.
    4.  
    5. Connect the negative battery cable. Start the engine and check for leaks.
    6.  

    4FB1 Diesel Engine
    1. Disconnect the negative battery cable. Remove the timing belt.
    2.  
    3. Remove the Allen bolts attaching the oil pump and remove the pump together with the pulley.
    4.  


    NOTE
    The special tool for the Allen bolts is J29767

    1. Disassemble the oil pump on the workbench. A gear puller may be necessary to remove the pulley.
    2.  



    Click image to see an enlarged view

    Fig. Oil pump assembly 4FB1 diesel engines

    To install:

    1. Apply generous amounts of clean engine oil to all components before installation. Install the vane with the taper side toward the cylinder body.
    2.  
    3. Install a new O-ring into the groove in the housing. Lubricate with oil. Install the rotor and then the pump body together with the pulley. Torque the Allen bolts to 11 and 1918 ft. lbs. (14 and 1925 Nm).
    4.  
    5. Install the timing bolt and covers as outlined in this Section.
    6.  
    7. Connect the battery cable, refill engine with oil, start the engine and check for leaks.
    8.  

    C223 and C223-T Diesel Engine
    1. Disconnect the negative battery cable and drain the engine oil.
    2.  


    CAUTION
    The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

    1. Remove the engine from the vehicle as outlined in this Section.
    2.  
    3. Remove the oil pan as outlined in this Section.
    4.  
    5. Remove the oil pipe from the oil pump. Remove the oil pump-to-engine bolts and the oil pump.
    6.  



    Click image to see an enlarged view

    Fig. Oil pump assembly C223 and C223-Turbo diesel engines

    To install:

    1. Clean the gasket mounting surfaces.
    2.  
    3. Using a new gasket, install the oil pump and connect the oil pipe to the oil pump. Install and torque the oil pan-to-engine bolts to 10 and 1917 ft. lbs. (14 and 1922 Nm).
    4.  
    5. Install the oil pan.
    6.  
    7. Install the engine into the vehicle.
    8.  
    9. Connect the negative battery cable, refill the engine oil, start the engine and check for leaks.
    10.  

    CHECKING OIL PUMP
    G180Z, G200Z Engine
    1. Visually inspect the oil pump for wear, damage or other abnormal conditions.
    2.  
    3. Remove the oil pump cover from the bottom of the oil pump.
    4.  
    5. Using a feeler gauge, measure the clearance between the pump body and the vane; it should be 0.16 and 190.22mm (0.0063 and 190.0086 in.), if not, replace the entire pump assembly.
    6.  
    7. Using a feeler gauge, measure the clearance between the rotor and the vane; it should be 0.13 and 190.15mm (0.0051 and 190.0059 in.), if not, replace the rotor set: pin, shaft, rotor and vane.
    8.  
    9. Place a straight edge across the bottom of the oil pump and a feeler gauge between the straight edge and the rotor; the clearance between the rotor/vane-to-cover should be 0.03 and 190.09mm (0.0011 and 190.0035 in.), if not, replace the rotor set: pin, shaft, rotor and vane.
    10.  
    11. Using a feeler gauge, measure the clearance between the pump body and the rotor shaft; it should be less than 0.2mm (0.0079 in.), if not, replace the entire pump assembly.
    12.  

    4ZC1-T, 4ZD1 and 4ZE1 Engine
    1. Visually inspect the oil pump for wear, damage or other abnormal conditions.
    2.  
    3. Insert the oil pump vane into the cylinder block.
    4.  
    5. Place a straight edge across the oil pump opening and a feeler gauge between the straight edge and the vane; the clearance between the vane-to-cylinder block surface should be 0.05 and 190.10mm (0.002 and 190.004 in.), if not, replace the vane.
    6.  
    7. Using a feeler gauge, measure the side clearance between the cylinder block and the vane; it should be 0.23 and 190.36mm (0.009 and 190.014 in.), if not, replace the vane.
    8.  
    9. Position the vane onto the rotor shaft.
    10.  
    11. Using a feeler gauge, measure the clearance between the rotor and the vane; it should be 0.13 and 190.15mm (0.005 and 190.006 in.), if not, replace the rotor and/or vane.
    12.  

    C223 Diesel Engine
    1. Visually inspect the oil pump for wear, damage or other abnormal conditions.
    2.  
    3. Remove the oil pump cover from the bottom of the oil pump.
    4.  
    5. Place a straight edge across the bottom of the oil pump and a feeler gauge between the straight edge and the rotor; the clearance between the rotor/vane-to-cover should be 0.02 and 190.07mm (0.0008 and 190.0028 in.), if not, replace the rotor set: pin, shaft, rotor and vane.
    6.  
    7. Using a feeler gauge, measure the clearance between the rotor and the vane; it should be less than 0.14mm (0.0055 in.), if not, replace the rotor set: pin, shaft, rotor and vane.
    8.  
    9. Using a feeler gauge, measure the clearance between the pump body and the vane; it should be 0.20 and 190.27mm (0.0079 and 190.0106 in.), if not, replace the entire pump assembly.
    10.  
    11. Using a feeler gauge, measure the clearance between the pump body and the rotor shaft; it should be less than 0.2mm (0.0079 in.), if not, replace the entire pump assembly.
    12.  


    NOTE
    When necessary to replace the pinion and shaft, install the shaft in the pump body and set the pinion on the shaft. Drill a hole through the pinion and shaft using a 5mm drill, then, install and stake the pin.

     
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