Toyota Corolla 1970-1987 Repair Guide

Engine Timing Cover (Front Cover)

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Only the K-series and T-series engines covered by this information utilize a timing chain (instead of a belt). The timing chain is run wet (oiled) and therefore the timing cover is also the engine front cover in the sense that it seals the front of the crankcase. On the 1C-L diesel engine and on all A-series engines, a timing belt is utilized. When a timing belt is used it is normally run dry, therefore the timing cover is NOT the seal for the front of the engine crankcase. On engines utilizing a timing belt, an oil pump body/front cover is mounted behind the timing belt and is used to seal the front of the crankcase.

REMOVAL & INSTALLATION



Except 1C-L and A-Series Engines

See Figures 1 and 2

  1. Drain the engine cooling system from the radiator, then drain the engine oil from the crankcase.
  2.  
  3. Disconnect the negative battery cable, then disconnect the positive cable. If necessary, remove the battery.
  4.  
  5. Remove the air cleaner assembly, complete with hoses, from its bracket.
  6.  
  7. Remove the hood latch as well as its brace and support.
  8.  
  9. Remove the headlight bezels and grille assembly.
  10.  
  11. Unfasten the upper and lower radiator hose clamps, then remove both of the hoses from the engine.
  12.  
  13. Unfasten the radiator securing bolts and remove the radiator.
  14.  

Take off the shroud first, if so equipped

  1. Loosen the drive belt adjusting link and remove the drive belt. Unfasten the alternator multi-connector, withdraw the retaining bolts, and remove the alternator.
  2.  
  3. If equipped, loosen the drive belt and remove the air injection pump. Disconnect the hoses from the pump before removing it.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Front cover and related components-K-series engines



Click image to see an enlarged view

Fig. Fig. 2: Front cover and related components-T-series engines

  1. Unfasten the crankshaft pulley retaining bolt. Remove the crankshaft pulley with a gear puller.
  2.  
  3. Remove the gravel shield from underneath the engine.
  4.  
  5. For the 3K-C engine, remove the nuts and washers from both the right and left front engine mounts. Detach the exhaust pipe flange from the exhaust manifold, then raise the front of the engine slightly.
  6.  
  7. On 2T-C engines, remove the right hand brace plate.
  8.  
  9. Remove the front oil pan bolts, to gain access to the bottom of the timing chain cover.
  10.  

It may be necessary to insert a thin knife between the pan and the gasket in order to break the pan loose. Use care not to damage the gasket

Installation is basically the reverse order of removal. There are, however, several points to remember:



Apply sealer to the two front corners of the 2T-C engine's oil pan gasket.
 
Tighten the crankshaft pulley to the figure given in the torque specifications chart.
 
Adjust the drive belts as detailed in General Information & Maintenance in this repair guide.
 

4A-C (RWD)

See Figure 3

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the drive belt(s).
  4.  
  5. Bring the engine to the top dead center timing position. Please refer to the cylinder head removal procedure for details.
  6.  
  7. Remove the crankshaft pulley using a suitable puller.
  8.  
  9. Remove the water pump pulley.
  10.  
  11. Remove the upper and lower timing case covers.
  12.  
  13. Installation is the reverse of removal. Tighten the timing belt cover fasteners to 61-99 inch lbs. (7-11 Nm).
  14.  



Click image to see an enlarged view

Fig. Fig. 3: Exploded view of the front cover and related components-RWD A-series engines

4A-C, 4A-LC (FWD)

See Figure 4

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the right side cover under the engine.
  4.  
  5. Loosen the water pump pulley bolts and then remove the alternator belt. Remove the power steering pump drive belt (if so equipped).
  6.  
  7. Remove the bolts and then disconnect the water pump pulley from the water pump.
  8.  
  9. Loosen the idler pulley mounting bolt. Loosen the adjusting nut and then remove the A/C drive belt. Remove the idler pulley.
  10.  
  11. Set the No. 1 piston to TDC of its compression stroke. Loosen the crankshaft pulley mounting bolt and then remove the pulley.
  12.  

Before removing the pulley, check that the rockers on the No. 1 cylinder are loose, if not, turn the engine one complete revolution

  1. Remove the mounting bolts and then remove the No. 1 (lower) timing belt cover.
  2.  
  3. Remove the four bolts and then remove the center engine mount.
  4.  
  5. Place a block of wood on a floor jack and then raise the engine slightly. Remove the two bolts, then remove the right engine mount.
  6.  



Click image to see an enlarged view

Fig. Fig. 4: Exploded view of the front cover and related components-FWD 4A-LC engine

  1. Lower the engine, then remove the No. 2 (upper) timing cover and its gasket.
  2.  
  3. Remove the No. 3 (center) timing cover and its gasket.
  4.  
  5. Installation is in the reverse order of removal. Tighten the crankshaft pulley bolt to 80-94 ft. lbs. (108-127 Nm) and the center engine mount bolts to 29 ft. lbs. (39 Nm).
  6.  

1C-L Diesel Engine

See Figure 5

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the cover under the engine.
  4.  
  5. Remove the power steering pump drive belt and pulley.
  6.  
  7. Remove the mounting bolts, then remove the power steering pump.
  8.  
  9. Remove the three clips and five bolts, then remove the No. 2 (upper) timing belt cover along with its gasket.
  10.  



Click image to see an enlarged view

Fig. Fig. 5: Exploded view of the front cover and related components-1C-L diesel engine

  1. Remove the alternator drive belt.
  2.  
  3. Set the No. 1 piston to TDC of the compression stroke. Loosen the set bolt and remove the crankshaft pulley.
  4.  
  5. Remove the mounting bolts, then remove the No. 1 (lower) timing belt cover along with the gasket and belt guide.
  6.  
  7. Remove the four bolts, then disconnect the center engine mount.
  8.  
  9. Installation is in the reverse order of removal. Tighten the center engine mount bolts to 29 ft. lbs. (39 Nm) and the crankshaft pulley bolt to 72 ft. lbs. (98 Nm). Tighten the power steering pump bolts and the idler pulley nut to 29 ft. lbs. (39 Nm).
  10.  

4A-GE

See Figure 6

For additional information, please refer to the timing belt removal and installation procedures located later in this section

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the air cleaner assembly, then remove the drive belt(s).
  4.  
  5. If the vehicle is equipped with cruise control, remove the actuator and bracket assembly.
  6.  
  7. Raise and support the vehicle safely using jackstands.
  8.  
  9. Remove the right side front tire and wheel, then remove the right side engine splash shield. Remove the right side mount insulator.
  10.  
  11. If necessary, remove the valve cover.
  12.  
  13. Remove the crankshaft pulley, then remove the timing cover mounting bolts and cover.
  14.  
  15. Install in the reverse order.
  16.  



Click image to see an enlarged view

Fig. Fig. 6: Exploded view of the 4A-GE cylinder head and upper engine components showing the timing covers, gears and belt.

 
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