Toyota Celica/Supra 1971-1985 Repair Guide

Oil Pump

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REMOVAL & INSTALLATION



Except 20R, 22R and 22R-EC Engines

See Figure 1



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Fig. Fig. 1: Oil pump removal on all engines except the 20R, 22R and 22R-EC

  1. Disconnect the negative battery cable. Raise the vehicle and support it safely. Drain the oil and cooling system.
  2.  
  3. Remove the air cleaner assembly. Mark any disconnected lines and/or hoses for easy reassembly. Remove the oil level gauge.
  4.  
  5. Disconnect the upper radiator hose at the radiator. Loosen the drive belts.
  6.  
  7. Remove the fan shroud bolts. Remove the 4 fluid coupling flange attaching nuts, then remove the fluid coupling along with the fan and the fan shroud.
  8.  
  9. Remove the engine undercover. Remove the exhaust pipe clamp bolt from the exhaust pipe stay.
  10.  
  11. Remove the 2 stiffener plates from the exhaust pipe. If equipped with manual transmission, remove the clutch housing undercover.
  12.  
  13. Remove the 4 engine mount bolts from each side of the engine.
  14.  
  15. Place a jack under the transmission and raise the engine about 1 3 / 4 inches (45mm).
  16.  
  17. Remove the oil pan retaining bolts. Remove the oil pan from the engine.
  18.  
  19. Remove the union bolt and nut, then disconnect the oil pump outlet pipe.
  20.  
  21. Unfasten the oil pump mounting bolt and remove the oil pump.
  22.  

To install:
  1. Position the oil pump and fasten its mounting bolt.
  2.  
  3. Install the oil pipe with its gasket lockwasher and union bolt.
  4.  
  5. Apply a suitable silicone sealer to the new oil pan gasket.
  6.  
  7. Install the oil pan over the block, install the retaining bolts and tighten the bolts to 57-82 inch lbs. (5-10 Nm). Lower the engine and install the 4 motor mount nuts.
  8.  
  9. Install the flywheel housing under cover.
  10.  
  11. Install the exhaust pipe clamp bolt to the pipe stay bracket.
  12.  
  13. Install the 2 stiffener plates. Install the engine undercover assembly.
  14.  
  15. Install the fan shroud together with the fluid coupling (fan clutch) to the engine compartment. Install the fan clutch on the pulley with the 4 nuts. Install the 4 fan shroud bolts.
  16.  
  17. Install the drive belt and adjust the fan belt to obtain the proper tension.
  18.  
  19. Connect the upper radiator hose. Install the air connector pipe with the air cleaner hoses.
  20.  
  21. Refill the coolant system and the engine oil.
  22.  
  23. Start the engine and check for leaks.
  24.  

20R, 22R and 22R-EC Engines

See Figure 2



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Fig. Fig. 2: The oil pump has five mounting bolts on the 20R, 22R and 22R-EC engines

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Drain the engine oil.
  6.  
  7. Disconnect the steering relay rod and the tie rods from the idler arm, Pitman arm, and steering knuckles.
  8.  
  9. Remove the engine stiffening plates.
  10.  
  11. Remove the splash pans from under the engine.
  12.  
  13. Position a floor jack under the transmission and raise the engine/transmission assembly slightly.
  14.  
  15. Remove the front motor mount attaching bolts.
  16.  
  17. Remove the oil pan bolts and remove the oil pan.
  18.  
  19. Unfasten the four bolts and remove the oil strainer.
  20.  
  21. Remove the drive belts.
  22.  
  23. Using a suitable puller, remove the crankshaft pulley.
  24.  
  25. Unfasten the five bolts and remove the oil pump.
  26.  

To install:
  1. Position the oil pump on the engine. Apply sealer to the upper bolt, then install and tighten the five mounting bolts
  2.  
  3. Clean and install the oil strainer with its four bolts.
  4.  
  5. Before installing the oil pan, thoroughly clean the cylinder block and oil pan mating surfaces of any old sealing material. Apply a 5mm bead of gasket sealer to the oil pan.
  6.  

Assemble parts within 5 minutes of applying the sealer.

  1. Install the oil pan. Alternately tighten the oil pan bolts to 9 ft. lbs. (12 Nm), starting in the middle of the pan and working out towards the ends.
  2.  
  3. Install the crankshaft pulley and drive belts.
  4.  
  5. Lower the engine and tighten the motor mount bolts. Install the splash shields and stiffening plate.
  6.  
  7. Install the remaining components.
  8.  
  9. Lower the vehicle.
  10.  
  11. Fill the engine with oil. Start the engine and check for leaks.
  12.  

OVERHAUL



The Celica engines utilize three types of oil pumps. The 4M-E, 5M-E and 5M-GE engines use a geared impeller type pump. The 20R and 22R series use an automatic transmission type gear pump. The 8R-C and 18R-C use a trochoid rotary type pump. In both gear types, there is a drive gear and a driven gear; pump inspection procedures are very similar on both types. Inspection of the trochoid pumps is similar to the gear types.

8R-C and 18R-C Engines

See Figure 3



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Fig. Fig. 3: Oil pump component identification-8R-C and 18R-C engines

  1. Remove the oil pump.
  2.  
  3. Disassemble the pump by removing the oil strainer, relief valve plug, gasket, spring, and relief valve from the pump cover. Remove the cover, drive shaft and driven rotor from the pump body.
  4.  
  5. Clean all parts in solvent and inspect for unusual wear and/or damage. Replace any parts if necessary. Pay special attention to the pump shaft, drive and driven rotors.
  6.  
  7. Check drive-to-driven rotor tip clearance, using a feeler gauge. If clearance exceed 0.008 inches (0.203mm), replace the rotors as a set.
  8.  
  9. Using the feeler gauge and a steel square or steel block, check side clearance between the rotor and pump cover surface. Replace the rotor and/or body if clearance exceeds 0.006 inches (0.152mm).
  10.  
  11. Measure the clearance between the driven rotor and pump body; clearance should be less than 0.008 inches (0.203mm). Replace the body and/or rotors as a set if clearance exceeds this figure.
  12.  
  13. Reassemble the pump in the reverse order of disassembly. Stamped marks are provided on the drive rotor and driven rotor, and should face toward the pump cover side (toward the underneath of the engine when installed).
  14.  
  15. Check pump operation by immersing the suction end of the pump in clean engine oil and turning the shaft counterclockwise by hand. Oil should come out of the discharge hole. Close the discharge hole with your thumb, and turn the shaft. The shaft should be difficult to turn. Use a flat bladed tool to rotate the rotor shaft.
  16.  

20R, 22R and 22R-EC Engines

See Figures 4, 5, 6 and 7



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Fig. Fig. 4: Exploded view of oil pump components-20R engine shown



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Fig. Fig. 5: Checking the driven gear-to-body clearance on the 20R engine's oil pump



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Fig. Fig. 6: Measuring the gear tip-to-crescent clearance



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Fig. Fig. 7: Checking the side clearance on the 20R engine's oil pump

  1. Remove the oil pump.
  2.  
  3. Matchmark the drive and driven gears before disassembling the pump.
  4.  
  5. Disassemble the pump by unscrewing the relief valve plug and removing the spring and relief valve piston. Remove the drive and driven gears, and clean all parts in solvent. Inspect all parts for unusual wear and replace if necessary.
  6.  
  7. Align the matchmarks and assemble the gears into the pump body. Using a feeler gauge, measure the clearance between the driven gear and the pump body. If clearance exceeds 0.008 inches (0.203mm), replace the gear and/or body.
  8.  
  9. Measure the clearance between both gear tips and the crescent with a feeler gauge. If clearance exceed 0.012 inches (0.304mm), replace the gears and/or body.
  10.  
  11. Using a feeler gauge and steel square or flat steel block, measure the gear side clearance as shown. If the clearance is greater than 0.15 inches (3.81mm), replace the gears and/or body.
  12.  
  13. Assemble the pump in the reverse order of disassembly.
  14.  

4M-E, 5M-E and 5M-GE Engines

See Figures 8 and 9



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Fig. Fig. 8: Exploded view of the oil pump-4M-E, 5M-E and 5M-GE engines



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Fig. Fig. 9: Measuring the backlash on a six-cylinder engine's oil pump

  1. Remove the oil pump.
  2.  
  3. Disassemble the pump by removing the relief valve plug, spring and relief valve. Remove the pump cover and riven gear. Using needlenose pliers, remove the snapring and remove the spacer, drive shaft gear, key and shaft sub-assembly.
  4.  
  5. Clean all parts in solvent, and inspect for scoring or other unusual wear. Replace any part that looks worn or damaged.
  6.  
  7. Measure driven gear-to-body clearance with a feeler gauge; if clearance exceeds 0.008 inches (0.203mm), replace the gear and/or body.
  8.  
  9. Insert a feeler gauge between the meshing faces of the two gears (gear backlash measurement). If the backlash is greater than 0.035 inches (0.889mm), replace the shaft sub-assembly and/or driven gear.
  10.  
  11. Using a feeler gauge and steel square or flat steel block, measure the side clearance. If clearance is greater than 0.0059 inches (0.149mm), replace the gears and/or pump body.
  12.  
  13. Reassemble the pump in the reverse order of disassembly. Check pump operation by immersing the suction end of the pump in clean engine oil and turning the shaft counterclockwise by hand. Oil should come out of the discharge hole. Close the discharge hole with your thumb, and turn the shaft. The shaft should be difficult to turn.
  14.  

 
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