Honda Accord/Prelude 1984-1995 Repair Guide

Oil Pump

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REMOVAL & INSTALLATION



1984-87 Prelude and 1984-89 Accord

See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the timing belt.
  4.  
  5. On 1984-85 Accord and 1984 Prelude, remove the oil pump drive pulley by unbolting it. Use caution; this nut has LEFT-HAND threads. On later models, the pulley is secured to the shaft by other means and comes off with the front pump cover.
  6.  



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Fig. Fig. 1: On early model Accords and Preludes, the oil pump is driven by the timing belt

  1. Remove the oil pump retaining bolts/nuts; remove the oil pump.
  2.  
  3. Clean the gasket mounting surfaces.
  4.  
  5. Remove the pump cover-to-pump housing bolts and the cover.
  6.  
  7. Inspect the pump for wear and/or damage; replace the parts, if necessary.
  8.  
  9. Reassemble the pump assembly and torque the pump cover-to-pump housing bolts to 5 ft. lbs. (7 Nm).
  10.  

To install:
  1. Using a new O-rings, install the pump. Tighten the oil pump mounting nut and bolts to 9 ft. lbs. (12 Nm).
  2.  
  3. Install the oil pump drive pulley if it was removed. Apply thread sealant before the nut is installed. Remember that the nut is left-hand threaded. Tighten the nut to 22 ft. lbs. (30 Nm).
  4.  
  5. Reinstall the timing belt and set the tension correctly.
  6.  
  7. Start the engine and check for leaks.
  8.  

1990-95 Four Cylinder Accords and 1988-95 Preludes

See Figures 2 and 3

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Drain the engine oil.
  6.  
  7. Bring the No. 1 cylinder to TDC.
  8.  
  9. Remove the valve cover and upper timing belt cover.
  10.  
  11. Remove the power steering pump belt and the alternator belt and the air conditioning belt if so equipped.
  12.  
  13. Remove the crankshaft pulley and the lower timing belt cover.
  14.  



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Fig. Fig. 2: On later model Accords and Preludes, the oil pump is driven directly by the crankshaft

  1. On Accords and 1992-95 Preludes, remove the following:
    1. Timing balancer belt.
    2.  
    3. Timing belt.
    4.  
    5. Timing belt tensioner.
    6.  
    7. Timing balancer belt tensioner.
    8.  
    9. Timing belt drive pulley.
    10.  
    11. Timing balancer belt driven pulley. Insert a suitable tool into the maintenance hole in the front balancer shaft in order to hold the shaft in place and remove the front balancer driven pulley.
    12.  
    13. Balancer drive gear case
    14.  
    15. Balancer driven gear. Remove the maintenance hole bolt from the cylinder block next to the rear balancer shaft. Insert a 6x100mm bolt or equivalent, to a depth of 3 in. (74mm) through the maintenance hole and into the rear balancer shaft. Remove the balancer shaft driven gear.

      Click image to see an enlarged view

      Fig. Fig. 3: The balancer shafts can be held with a bolt or similar tool through the maintenance holes

    16.  

  2.  
  3. On 1988-91 Preludes, remove the following:
    1. Timing belt tensioner.
    2.  
    3. Timing belt.
    4.  
    5. Timing belt drive pulley.
    6.  

  4.  
  5. Remove the oil pan and oil screen.
  6.  
  7. Remove the oil pump mount bolts and the oil pump assembly.
  8.  

To install:
  1. Make sure all gasket mating surfaces are clean prior to installation.
  2.  
  3. Inspect the crankshaft oil seal and replace as necessary prior to installing the oil pump.
  4.  
  5. Apply liquid gasket to the cylinder block mating surface of the block. Apply a light coat of oil to the crankshaft seal lip. Install a new O-ring on the cylinder block and install the oil pump. Apply liquid gasket to the threads of the oil pump mounting bolts and tighten them to 9 ft. lbs. (12 Nm).
  6.  

Once the sealant is applied, do not wait longer than 15 minutes to install the parts; the sealant will become ineffective. After final assembly, wait at least 30 minutes before adding oil to the engine, giving the sealant time to set.

  1. Install the oil screen.
  2.  
  3. On Accords and 1992-95 Preludes, perform the following procedure:
    1. Apply molybdenum disulfide grease to the thrust surfaces of the balancer gears, before installing the balancer driven gear and the balancer drive gear case.
    2.  
    3. Hold the rear balancer shaft with the 6x100mm bolt or equivalent, then install the balancer driven gear and the balancer drive belt pulley. Tighten the retaining bolt to 18 ft. lbs. (25 Nm).
    4.  
    5. Hold the front balancer shaft with a suitable tool, then install the timing balancer belt driven pulley. Tighten the retaining bolt to 22 ft. lbs. (30 Nm).
    6.  
    7. Install the balancer gear case to the oil pump. Align the groove on the pulley edge to the pointer on the gear case when holding the rear balancer shaft with the 6x100mm bolt or equivalent, then install the gear case. Tighten the balancer gear case bolts to 18 ft. lbs. (25 Nm).
    8.  
    9. Remove the 6x100mm bolt and install the maintenance hole bolt.
    10.  

  4.  
  5. Install the oil pan and the remainder of the components. Be sure to properly tension the timing belt after installation. Tighten the crankshaft pulley bolt to specification.
  6.  
  7. Start the engine and check for leaks.
  8.  

Accord V-6

See Figures 4 and 5

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Drain the engine oil.
  6.  
  7. Bring the No. 1 cylinder to TDC.
  8.  



Click image to see an enlarged view

Fig. Fig. 4: The oil pump used on the Accord V-6 is driven directly by the crankshaft

  1. Remove the splash shield from under the vehicle.
  2.  
  3. Remove the timing belt.
  4.  
  5. Unplug the crankshaft position sensor. Loosen the bolts securing it to the engine, then remove it from the vehicle.
  6.  
  7. Remove the timing belt tensioner.
  8.  
  9. Remove the stopper plate next to the timing belt drive pulley.
  10.  



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Fig. Fig. 5: The stopper plate is positioned next to the timing belt drive pulley

  1. Remove the oil filter. Disconnect the oil pressure switch terminal and remove the bolts from the filter base. Remove the oil filter base from the engine.
  2.  
  3. Remove bolts securing the oil screen, baffle plate, oil pass pipe and oil pump. Remove components from the engine.
  4.  

To install:
  1. Make sure all gasket mating surfaces are clean prior to installation.
  2.  
  3. Inspect the oil seal and replace as necessary prior to installing the oil pump.
  4.  
  5. Apply liquid gasket to the pump housing, then apply a coat of grease to the seal lip. Install the oil pump. Apply liquid gasket to the threads of the oil pump mounting bolts. Tighten the 6mm bolts to 9 ft. lbs. (12 Nm) and the 8mm bolts to 16 ft. lbs. (22 Nm).
  6.  

Once the sealant is applied, do not wait longer than 15 minutes to install the parts; the sealant will become ineffective. After final assembly, wait at least 30 minutes before adding oil to the engine, giving the sealant time to set.

  1. Install the oil pass pipe, baffle plate and oil screen. Use new O-rings. Tighten the bolts to 9 ft. lbs. (12 Nm).
  2.  
  3. Apply liquid gasket to the areas shown in the illustration. Install the oil pan with a new gasket.
  4.  
  5. Install the remainder of the components. Be sure to properly tension the timing belt after installation. Tighten the crankshaft pulley bolt to specification.
  6.  
  7. Start the engine and check for leaks.
  8.  

INSPECTION & OVERHAUL



These procedures are performed with the oil pump removed from the engine.

1984-87 Prelude and 1984-89 Accord

See Figures 6, 7 and 8

  1. Check the radial clearance between the inner and outer rotors. Maximum clearance is 0.008 in. (0.20mm).
  2.  
  3. Check the axial clearance between the housing cover and the outer rotor. The limit is 0.006 in. (0.15mm).
  4.  



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Fig. Fig. 6: Check the radial clearance between the inner and outer rotors



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Fig. Fig. 7: The axial clearance between the housing cover and outer rotor must also be checked

  1. Remove the pump housing cover.
  2.  
  3. Check the housing-to-outer rotor radial clearance. Maximum allowable clearance is 0.008 in. (0.20mm).
  4.  



Click image to see an enlarged view

Fig. Fig. 8: Check the housing-to-outer rotor radial clearance as well

  1. Inspect the rotors for scoring or other damage.
  2.  
  3. If the rotors require replacement, install the inner and outer rotors with the punch marks aligned adjacent to one another.
  4.  
  5. Install new seals and O-rings in the case halves. If applicable, use a seal driver of the correct diameter to install the shaft seal. Gently drive the seal in until the driver contacts the cover.
  6.  
  7. Reassemble the pump. Use threadlocking compound on the small pump case screws. Tighten them to 5 ft. lbs. (7 Nm).
  8.  
  9. Make sure the pump turns without any binding or locking.
  10.  

1988-95 Prelude and 1990-95 Accord

See Figures 9, 10 and 11

  1. With the oil pump removed, separate the housing and cover by removing the bolts.
  2.  
  3. Check the radial clearance between the inner and outer pump rotors. The wear limit is 0.008 in. (0.20mm).
  4.  



Click image to see an enlarged view

Fig. Fig. 9: Check the clearance between the inner and outer rotors

  1. Check the axial clearance between the pump housing and the outer rotor. Use a precision straightedge across the housing. Maximum clearance is 0.005 in. (0.12mm).
  2.  



Click image to see an enlarged view

Fig. Fig. 10: Use a straightedge to check the axial clearance between the outer rotor and housing

  1. Inspect the radial clearance between the housing and the outer rotor. The wear limit is 0.008 in. (0.20mm).
  2.  



Click image to see an enlarged view

Fig. Fig. 11: The radial clearance between the outer rotor and housing must also be checked

  1. Visually check both rotors for cracking or scoring. Replace them as needed.
  2.  
  3. Remove the oil seal and O-rings. Install a new one with the proper diameter seal driver. Gently tap the seal into place until the driver contacts the housing.
  4.  
  5. Reassemble the pump. Apply thread locking compound to the bolts and tighten them to 5 ft. lbs. (7 Nm). Check that the oil pump turns freely without any binding or locking.
  6.  

 
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