GM Storm/Spectrum 1985-1993 Repair Guide

Oil Pump

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The oil pump is located in a housing mounted to the lower front portion of engine. The pump may be serviced after the cover has been removed. For the Spectrum, the engine must first be removed from the vehicle.

REMOVAL & INSTALLATION



Spectrum

See Figure 1

  1. Remove the engine from the vehicle. Drain the engine oil from the crankcase.
  2.  
  3. Remove the alternator belt. Remove the starter assembly.
  4.  
  5. Install the flywheel holding tool J-35271 or equivalent, to secure the flywheel.
  6.  
  7. Remove the crankshaft pulley and boss.
  8.  
  9. Remove the timing cover bolts and the timing cover.
  10.  
  11. Loosen the tension pulley and remove the timing belt.
  12.  
  13. Remove the crankshaft timing gear and the tension pulley.
  14.  
  15. Remove the oil pan bolts, oil pan, oil strainer fixing bolt and the oil strainer assembly.
  16.  
  17. Remove the oil pump bolts and the oil pump assembly.
  18.  
  19. Remove the sealing material from the oil pump and engine block sealing surfaces.
  20.  
  21. To install, lubricate the oil pump, use new gaskets, apply sealant to the sealing surfaces and reverse the removal procedures.
  22.  

Before installing the oil pump it would be a good idea to check the oil pressure relief valve and spring incorporated into the oil pump assembly. Remove the relief valve retaining plug along with the spring. Clean or replace the valve and spring assembly as necessary and reinstall it. Torque the retaining plug to 27 ft. lbs. (37 Nm). Be careful not to accidentally force the garter spring out of position during the oil pump assembly.

  1. During installation, torque the oil pump mounting bolts to 7 ft. lbs. (10 Nm) and the oil strainer fixing bolts to 13 ft. lbs. (18 Nm).
  2.  



Click image to see an enlarged view

Fig. Fig. 1: Remove the oil pump bolts in order to remove the assembly from the engine

Storm
EXCEPT 1.8L ENGINE

See Figure 1

  1. Disconnect the battery negative cable.
  2.  
  3. Remove the power steering and alternator belts.
  4.  
  5. Remove the timing belt.
  6.  
  7. Raise and support the vehicle safely.
  8.  
  9. Remove the crankshaft pulley.
  10.  
  11. Remove the oil pump attaching bolts, then the oil pump from the vehicle.
  12.  
  13. Reverse procedure to install. Apply suitable sealant to the oil pump gasket surface. Install bolts and torque to 89 inch lbs. (10 Nm). Connect the battery negative cable. Start engine and check for leaks.
  14.  

1.8L ENGINE

See Figure 1

  1. Disconnect the negative battery cable and drain the engine crankcase.
  2.  
  3. Remove the 6 bolts and the timing belt upper cover.
  4.  
  5. Remove the serpentine drive belt. Support the engine using a floor jack.
  6.  
  7. Remove the bolt and nut from the right engine support bracket, then remove the through bolt and remove the mount from the vehicle.
  8.  
  9. Remove 3 power steering pump bolts and position the pump forward for access to the serpentine drive belt tensioner.
  10.  
  11. Remove the center bolt and the serpentine belt tensioner from the mounting bracket.
  12.  
  13. Remove the 4 bolts and the right engine mount bridge.
  14.  
  15. Remove the 3 bolts and timing belt lower cover.
  16.  
  17. Lower the engine sufficiently for access to the crankshaft pulley, then remove the center bolt and the crankshaft pulley from the engine. Loosen the timing belt tensioner pulley by 1 / 2 turn.
  18.  
  19. Remove the timing belt from the crankshaft timing pulley, then using J-28509-A, or an equivalent sprocket removal tool, remove the timing pulley from the crankshaft.
  20.  
  21. Remove the oil pump bolts and the oil pan nuts, then remove the oil pump from the engine block. Thoroughly clean the gasket mating surfaces.
  22.  

To install:
  1. Apply a coat of silicone sealant to the oil pump gasket surface, making sure the no sealant plugs any oil pump ports. Install the pump to the cylinder block, then tighten the bolts and nuts to 89 inch lbs. (10 Nm).
  2.  
  3. Install the timing pulley to the crankshaft, then install the timing belt to the crankshaft pulley. Tighten the tensioner bolt to 31 ft. lbs. (42 Nm). Install the crankshaft pulley to the crankshaft and tighten the pulley center bolt to 108 ft. lbs. (147 Nm).
  4.  
  5. Reposition the engine, then install the timing belt lower cover. Tighten the retaining bolts to 89 inch lbs. (10 Nm).
  6.  
  7. Install the right engine mount bridge and tighten the retaining bolts to 37 ft. lbs. (50 Nm).
  8.  
  9. Install the serpentine drive belt tensioner to the mounting bracket and tighten the center bolt to 30 ft. lbs. (40 Nm).
  10.  
  11. Reposition the power steering pump and tighten the retaining bolts to 15 ft. lbs. (20 Nm).
  12.  
  13. Install the right engine mount to the vehicle, but do not fully tighten the through bolt at this time. Install the bolts and nut to the right engine mount bracket and tighten to 30 ft. lbs. (40 Nm), then tighten the through bolt to 50 ft. lbs. (68 Nm).
  14.  
  15. Remove the floor jack and install the serpentine drive belt.
  16.  
  17. Install the timing belt upper cover and tighten the bolts to 89 inch lbs. (10 Nm).
  18.  
  19. Connect the negative battery cable and fill the engine crankcase.
  20.  

INSPECTION & OVERHAUL



See Figures 2 through 6

  1. Remove the oil pump/housing assembly from the vehicle.
  2.  
  3. Inspect the outside of the pump assembly for cracking or other damage. The assembly must be replaced if damage is found.
  4.  
  5. Remove the cover bolts (5 Spectrum or 4 for Storm engines), then remove the cover from the pump housing assembly.
  6.  
  7. Remove the relief valve plug and seal, then remove the spring and valve from the bore in the side of the pump housing.
  8.  
  9. Remove the oil seal from the pump assembly.
  10.  
  11. Using a feeler gauge, measure the clearance between driven gear and the pump body. If clearance exceeds 0.0078 in. (0.20mm) for the Storm or 0.0070 in. (0.18mm) for the Spectrum, replace the oil pump.
  12.  
  13. Using a feeler gauge, measure the clearance between the gear tips. If clearance exceeds 0.012 inch (0.30mm) for the Storm or 0.0138 inch (0.35mm) for the Spectrum, replace the gear set.
  14.  
  15. Using a feeler gauge and a straight edge, check the housing-to-gear set clearance. If clearance exceeds 0.004 inch (0.10mm), replace the oil pump.
  16.  



Click image to see an enlarged view

Fig. Fig. 2: Oil pump housing cover and retaining bolts - Spectrum (Storm engines similar)



Click image to see an enlarged view

Fig. Fig. 3: Removing the relief valve assembly from the side of the pump housing



Click image to see an enlarged view

Fig. Fig. 4: Using a feeler gauge, measure the clearance between driven gear and the pump body



Click image to see an enlarged view

Fig. Fig. 5: Measure the clearance between the gear tips



Click image to see an enlarged view

Fig. Fig. 6: Using a feeler gauge and a straight edge, check the housing-to-gear set clearance

 
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