BMW Cars 1999-06

Oil Pump

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Inspection




NOTE
The oil pump is responsible for providing constant lubrication to the whole engine and so it is recommended that a new oil pump be installed when rebuilding the engine.

Completely disassemble the oil pump and thoroughly clean all of the components. Inspect the oil pump gears and housing for wear and/or damage. Insure that the pressure relief valve operates properly and there is no binding or sticking due to varnish or debris. If all of the parts are in proper working condition, lubricate the gears and relief valve, and assemble the pump.

Inspection & Overhaul



Except M42 And M44 Engines

Check that the oil pump turns freely and without binding. Check that the oil pump pickup screen is not clogged. Check the condition of the drive sprocket on chain driven pumps.

While the pumps can be disassembled and checked for wear, it is more common to replace the oil pump if it has seen long service. If the pump is to be disassembled, be sure that new gaskets are available before disassembling the pump body.

If the drive sprocket is found to be worn as indicated by pointy teeth, replace the chain at the same time. The sprocket and the chain will wear at the same rate. In cases of severe wear, the crankshaft gear may need to be replaced also. This will require the crankshaft to be removed.

Depress the oil pressure relief valve washer and remove the snapring. Measure the free length of the spring and check that the piston can move freely. The valve is contained in the body of the oil pump.

Inspect the engine rod and main bearings. If either the crankshaft journals or the bearing journals show signs of excessive heat, grooving or excessive wear, replace the oil pump in addition to any other related worn components.

M42 And M44 Engines
  1. With the timing case removed, remove the cover from the pump rotors. Make note of the positioning of the rotors.
  2.  
  3. Measure the play between the pump body and the outer rotor; outer rotor and inner rotor. The distance should be 0.005-0.008 inch (0.12-0.20mm).
  4.  
  5. The marks on the rotors face up and the rotors should be placed in the original orientation as removed. Replace the cover assembly and tighten to 71-88.5 inch lbs. (8-10 Nm).
  6.  
  7. Depress the oil pressure relief valve washer and remove the snapring. Measure the free length of the spring and check that the piston can move freely.
  8.  



Click image to see an enlarged view

Fig. Inspecting the clearance between the inner and out rotor of the oil pump-M42 engine illustrated

Removal & Installation



E36 6-Cylinder Engines
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the oil pan as outlined in this section to access the oil pump drive sprocket.
  4.  


NOTE
The oil pump sprocket mounting nut is a left hand thread.

  1. Remove the oil pump drive sprocket nut by turning it clockwise as it is a left-hand thread. Remove the oil pump drive sprocket from the oil pump shaft. Check the shaft splines.
  2.  
  3. Unbolt the oil pump body from the block and remove. Check the condition of the dowel sleeves.
  4.  

To install:

  1. Clean the oil pump mounting surfaces, then position the oil pump on the engine. Install the oil pump body mounting bolts to 16 ft. lbs. (22 Nm).
  2.  
  3. Install the oil pump drive sprocket onto the oil pump shaft, then install the oil pump drive sprocket nut by turning it counterclockwise to 18 ft. lbs. (25 Nm).
  4.  


NOTE
The sprocket nut is tightened in a counterclockwise direction as it has left hand threads.

  1. Install the oil pan.
  2.  
  3. Install and tighten the oil pan drain plug.
  4.  
  5. Lower the vehicle
  6.  
  7. Fill the engine with the correct viscosity and amount of clean engine oil.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Start the engine and check that oil pressure is present; if the oil pressure lamp does not extinguish within 5-7 seconds of starting the engine, turn the engine OFF . Check for any oil leaks.
  12.  

M20 Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the oil pan as outlined in this section to expose the oil pump.
  4.  
  5. Remove the oil pump mounting bolts and the oil pump support mounting bolts.
  6.  
  7. Lower the oil pump and the driveshaft.
  8.  

To install:

  1. Inspect and if necessary, replace the oil pump driveshaft bearing as follows:
    1. Remove the clamp bolt holding the pump driveshaft.
    2.  
    3. Pull the cover with the gear out of the bore. Check the condition of the O-ring and replace if necessary.
    4.  
    5. Use Tool No. 11 1 310 or equivalent, to drive out the needle bearing out through the top of the bore.
    6.  
    7. Lubricate the new needle bearing with grease and install with Tool No. 11 1 300 or equivalent. Drive the bearing into the bore until fully seated.
    8.  

  2.  
  3. Install the gear and cover.
  4.  
  5. Fill the oil pump pressure side with oil.
  6.  
  7. Install the oil pump and guide the driveshaft up into the drive gear and tighten the bolts to 15-17 ft. lbs. (20-24 Nm).
  8.  
  9. The balance of assembly is in reverse order of disassembly.
  10.  

M42 And M44 Engines

NOTE
The engine oil pump is located in the front engine housing.

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Drain the engine oil into a sealable container.
  6.  
  7. Remove the timing case cover.
  8.  
  9. Disconnect the oil pump cover mounting bolts and remove the oil pump assembly.
  10.  



Click image to see an enlarged view

Fig. Oil pump cover mounting bolts in the timing cover-M42 engine illustrated

To install:

  1. Clean the oil pump mounting surfaces
  2.  
  3. Replace the gasket and install the timing case. Make sure the lubrication spray nozzle faces the bolt.
  4.  
  5. Install and tighten the oil pan drain plug.
  6.  
  7. Lower the vehicle
  8.  
  9. Fill the engine with the correct viscosity and amount of clean engine oil.
  10.  
  11. Connect the negative battery cable.
  12.  
  13. Start the engine and check that oil pressure is present; if the oil pressure lamp does not extinguish within 5-7 seconds of starting the engine, turn the engine OFF . Check for any oil leaks.
  14.  

M44 1.9L Engines

NOTE
The engine oil pump is located in the front engine housing.

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Engine oil
     
    Timing case cover
     
    Oil pump cover mounting bolts and oil pump assembly
     

  4.  

To install:

  1. Clean the oil pump mounting surfaces
  2.  
  3. Install or connect the following:

    Oil pump on the engine. Install the oil pump cover mounting bolts.
     
    Timing case cover
     
    Oil pan drain plug, then fill the engine with oil
     
    Negative battery cable
     

  4.  
  5. Start the engine and check that oil pressure is present; if the oil pressure lamp does not turn off within 5-7 seconds of starting the engine, turn the engine OFF . Check for any oil leaks.
  6.  

M50/M52/S50 Engines
  1. Raise and safely support vehicle. Disconnect the negative battery cable. Drain the oil from the engine. Remove the oil pan to access the oil pump drive sprocket.
  2.  
  3. Remove the oil pump drive sprocket nut. Note that it is a left-hand thread. Remove the oil pump drive sprocket from the oil pump shaft. Check the shaft splines.
  4.  
  5. Unbolt the oil pump body from the block and remove. Check the condition of the dowel sleeves.
  6.  

To install:

  1. Clean the oil pump mounting surfaces, then position the oil pump on the engine. Install the oil pump body mounting bolts to 16 ft. lbs. (22 Nm).
  2.  
  3. Install the oil pump drive sprocket onto the oil pump shaft. Install the oil pump drive sprocket nut to 18 ft. lbs. (25 Nm). The sprocket nut must be tightened in a counterclockwise direction; it has a reverse, or left-hand thread.
  4.  
  5. Install the oil pan.
  6.  
  7. Install and tighten the oil pan drain plug, then fill the engine with the correct viscosity and amount of clean engine oil.
  8.  
  9. Lower the vehicle and connect the negative battery cable.
  10.  
  11. Start the engine and check that oil pressure is present; if the oil pressure lamp does not turn off within 5-7 seconds of starting the engine, turn the engine OFF . Check for any oil leaks.
  12.  

M52 2.5L, 2.8L, And S52 3.2L Engines
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Oil
     
    Oil pan, to access the oil pump drive sprocket
     
    Oil pump drive sprocket nut. Note that it is a left-hand thread. Remove the oil pump drive sprocket from the oil pump shaft. Check the shaft splines.
     
    Oil pump body. Check the condition of the dowel sleeves.
     

  4.  

To install:

  1. Clean the oil pump mounting surfaces.
  2.  
  3. Install or connect the following:

    Oil pump on the engine. Mounting bolts: 16 ft. lbs. (22 Nm).
     
    Oil pump drive sprocket onto the oil pump shaft. Oil pump drive sprocket nut: 18 ft. lbs. (25 Nm). The sprocket nut must be tightened in a counterclockwise direction; it has a reverse, or left hand thread.
     
    Oil pan
     
    Oil pan drain plug, then fill the engine with oil
     
    Negative battery cable
     

  4.  
  5. Start the engine and check that oil pressure is present; if the oil pressure lamp does not extinguish within 5-7 seconds of starting the engine, turn the engine OFF . Check for any oil leaks.
  6.  

M54 & S54 Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Oil
     
    Oil pan, to access the oil pump drive sprocket
     
    Oil pump drive sprocket nut. Note that it is a left-hand thread
     
    Oil pump drive sprocket from the oil pump shaft. Check the shaft splines.
     
    Oil pump body. Check the condition of the dowel sleeves.
     

  4.  

To install:

  1. Clean the oil pump mounting surfaces.
  2.  
  3. Install or connect the following:

    Oil pump on the engine. Mounting bolts: 16 ft. lbs. (22 Nm).
     
    Oil pump drive sprocket onto the oil pump shaft. Oil pump drive sprocket nut: 18 ft. lbs. (25 Nm). The sprocket nut must be tightened in a counterclockwise direction; it has a reverse, or left hand thread.
     
    Oil pan
     
    Oil pan drain plug, then fill the engine with oil
     
    Negative battery cable
     

  4.  
  5. Start the engine and check that oil pressure is present; if the oil pressure lamp does not extinguish within 5-7 seconds of starting the engine, turn the engine OFF . Check for any oil leaks.
  6.  

M60/M62 Engines
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the lower oil pan.
  4.  
  5. Disconnect the left and right engine mounts at the bottom.
  6.  
  7. Unbolt the power steering pump at the holder. On automatic transmissions, remove the oil pipes at the power steering pump.
  8.  
  9. Remove the banjo bolt for the oil return pipe from the oil filter at the oil pan.
  10.  
  11. Remove the mounting bolt on the sprocket for the oil pump and remove the sprocket along with the chain.
  12.  
  13. Remove the three oil pump mounting bolts and remove the oil pump. Remove the oil pipes out of the crankcase.
  14.  

To install

  1. Check the seals on the oil pipes and replace it if necessary. Lubricate the seals with oil and the oil pipes.
  2.  
  3. Check the seal in the oil pump and replace it if necessary. Screw the hexagon adapter back into the oil pump until it stops.
  4.  
  5. Position the oil pump and install the two right side oil pump mounting bolts. Torque the bolts to 14-17 ft. lbs. (20-24 Nm). Position the chain on the pump and the sprocket and install the sprocket. Torque the bolt to 35 ft. lbs. (47 Nm). Verify that the chain is positioned correctly.
  6.  
  7. Adjust the chain sag to 0.315-0.472 in. (8-12mm) by turning the hexagon adapter in the oil pump. Install the left side mounting bolt.
  8.  
  9. Install the banjo bolt for the oil return pipe from the oil filter at the oil pan.
  10.  
  11. Install the power steering pump and connect the oil lines (if equipped).
  12.  
  13. Install the lower oil pan.
  14.  
  15. Fill the engine oil. Connect negative battery cable.

    Click image to see an enlarged view

    Fig. Fresh oil pipe (1), and pure oil pipe (2)-M60/M62 engines

  16.  

M62 4.4L Engines
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Lower oil pan
     
    Left and right engine mounts at the bottom
     
    Power steering pump at the holder. On automatic transmissions, remove the oil pipes at the power steering pump.
     
    Banjo bolt for the oil return pipe from the oil filter at the oil pan
     
    Mounting bolt on the sprocket for the oil pump and remove the sprocket along with the chain
     
    3 oil pump mounting bolts and remove the oil pump. Remove the oil pipes out of the crankcase.
     

  4.  

To install

  1. Check the seals on the oil pipes and replace it if necessary. Lubricate the seals with oil and the oil pipes.
  2.  
  3. Check the seal in the oil pump and replace it if necessary. Screw the hexagon adapter back into the oil pump until it stops.
  4.  
  5. Install or connect the following:

    Oil pump and 2 right side oil pump mounting bolts. Bolts: 14-17 ft. lbs. (20-24Nm).
     

  6.  
  7. Position the chain on the pump and the sprocket and install the sprocket. Bolt: 35 ft. lbs. (47 Nm). Verify that the chain is positioned correctly.
  8.  
  9. Adjust the chain sag to 0.315-0.472 inches (8-12mm) by turning the hexagon adapter in the oil pump, then install the left side mounting bolt.
  10.  
  11. Install or connect the following:

    Banjo bolt for the oil return pipe from the oil filter at the oil pan
     
    Power steering pump and connect the oil lines, if equipped
     
    Lower oil pan
     
    Engine oil
     
    Negative battery cable

    Click image to see an enlarged view

    Fig. Fresh oil pipe (1), and pure oil pipe (2) locations-M62 4.4L engines

     

  12.  

M62 Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Lower oil pan
     
    Left and right engine mounts at the bottom
     
    Power steering pump at the holder
     
    Oil pipes at the power steering pump, on automatic transmissions
     
    Banjo bolt for the oil return pipe from the oil filter at the oil pan
     
    Mounting bolt on the sprocket for the oil pump and remove the sprocket along with the chain
     
    3 oil pump mounting bolts and remove the oil pump. Remove the oil pipes out of the crankcase.
     

  4.  

To install

  1. Check the seals on the oil pipes and replace it if necessary. Lubricate the seals with oil and the oil pipes.
  2.  
  3. Check the seal in the oil pump and replace it if necessary. Screw the hexagon adapter back into the oil pump until it stops.
  4.  
  5. Install or connect the following:

    Oil pump and 2 right side oil pump mounting bolts. Bolts: 14-17 ft. lbs. (20-24Nm).
     

  6.  
  7. Position the chain on the pump and the sprocket and install the sprocket. Bolt: 35 ft. lbs. (47 Nm). Verify that the chain is positioned correctly.
  8.  
  9. Adjust the chain sag to 0.315-0.472 inches (8-12mm) by turning the hexagon adapter in the oil pump, then install the left side mounting bolt.
  10.  
  11. Install or connect the following:

    Banjo bolt for the oil return pipe from the oil filter at the oil pan
     
    Power steering pump and connect the oil lines, if equipped
     
    Lower oil pan
     
    Engine oil
     
    Negative battery cable

    Click image to see an enlarged view

    Fig. Fresh oil pipe (1), and pure oil pipe (2) locations-M62 engines

     

  12.  

M73 5.4L Engines
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Oil pan
     
    Bolts retaining the sprocket to the oil pump shaft and remove the sprocket
     
    Oil pump retaining bolts and lower the oil pump from the engine block. There are 3 bolts at the front and 2 bolts attaching the rear of the oil pick-up to the lower end of a support bracket. It is necessary to remove all 5 bolts.
     

  4.  
  5. Do not loosen the chain adjusting shims from the 2 mounting locations.
  6.  

To install:

  1. Add or subtract shims between the oil pump body and the engine block to obtain a slight movement of the chain under light thumb pressure.
  2.  
  3. Install oil pump in position.
    NOTE
    When used, the 2 shim thicknesses must be the same. Tighten the pump holder at the pick-up end after shimming is completed to avoid stress on the pump.

  4.  
  5. After the main pump mounting bolts are tightened, loosen the bolts at the bracket on the rear of the pick-up, allowing the pick-up to assume its most natural position. This will relieve tension on the bracket.
  6.  
  7. The balance of installation is the reverse of the removal procedure.
  8.  
  9. Install or connect the following:
    NOTE
    Start the engine and check that oil pressure is present; if the oil pressure lamp does not extinguish within 5-7 seconds of starting the engine, turn the engine OFF .



    Oil pan
     
    Oil pan drain plug, then fill the engine with oil
     
    Negative battery cable
     

  10.  

N52 Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:
    NOTE
    Timing chain of triangular drive is pressed upwards by chain tensioner. Do not remove pulley from assembly.



    Negative battery cable
     
    Oil pan
     
    Oil pump intake pipe fasteners and oil pump intake pipe, pull towards transmission
     
    Oil pump pulley bolt

    Click image to see an enlarged view

    Fig. Oil pump mounting bolts (1) - N52 Engine

     
    Oil pump mounting bolts
     



    Oil pump pulley, pull towards front of engine bay
     
    Oil pump
     

  4.  

To install

  1. Check the seals on the oil pipes and replace it if necessary. Lubricate the seals with oil and the oil pipes.
  2.  
  3. Check the seal in the oil pump and replace it if necessary.
  4.  
  5. Align twin surface on oil pump to sprocket wheel.
  6.  
  7. Replace all aluminum fasteners.
  8.  
  9. Install or connect the following:

    Oil pump to bedplate:
     

    1. Step 1: 25 ft. lbs. (34 Nm).
    2.  
    3. Step 2: 180 degrees

      Chain module to crankcase and oil pump:
       

    4.  
    5. Step 1: 35 inch lbs. (4 Nm).
    6.  
    7. Step 2: 45 degrees

      Pulley to oil pump:
       

    8.  
    9. Step 1: 15 ft. lbs. (20 Nm)
    10.  
    11. Step 2: 45 degrees

      Intake pipe to bedplate:
       

    12.  
    13. Step 1: 35 inch lbs. (4 Nm)
    14.  
    15. Step 2: 100 degrees

      Engine oil
       

    16.  

  10.  
  11. Reverse remaining removal procedure.
  12.  
  13. Start engine and check for oil leaks.
  14.  

S14 Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the oil pan to expose the oil pump.
  4.  
  5. Remove the sprocket mounting nut by turning it clockwise and pull the sprocket from the shaft.
  6.  


NOTE
The sprocket nut is a left hand thread.

  1. Remove the oil pump mounting bolts and the oil pump support mounting bolts.
  2.  
  3. Lower the oil pump.
  4.  

To install:

  1. Install the oil pump on the engine and tighten the pump-to-block bolts, then the support bolts to 15-17 ft. lbs. (20-24 Nm).
  2.  
  3. Place the pump drive chain around the drive sprocket and slide over the pump shaft. Tighten the nut by turning it counterclockwise to 18-21 ft. lbs. (25-29 Nm).
  4.  
  5. Check the slack in the drive chain. The chain should have slight free-play when depressed on thumb pressure.
  6.  
  7. If the chain is too loose, add oil pump mounting shims as necessary between the pump and engine block mounting. The shims are available at your dealer or parts supplier. Be sure to match the bore in the shim with the bore in the block.
  8.  
  9. The balance of assembly is in reverse order of disassembly.
  10.  

 
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