Toyota Corolla 1970-1987 Repair Guide

Adjustment

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ALL ENGINES EXCEPT 1C-L AND 4A-GE



See Figures 1 through 12

  1. Start the engine and run it until it reaches normal operating temperature.
  2.  
  3. Stop the engine, then remove the air cleaner assembly.
  4.  
  5. Remove any other hoses, cables, etc. which are attached to, or in the way of the, cylinder head (camshaft/valve) cover. Remove the cylinder head cover.
  6.  


CAUTION
Be careful when removing components as the engine will be hot

  1. Turn the crankshaft until the pointer or notch on the pulley aligns with the O or T mark on the timing scale. This will insure that the engine is at TDC.
  2.  

Check that the rocker arms on the No. 1 cylinder are loose and those on the No. 4 cylinder are tight. If not, turn the crankshaft one complete revolution (80 degrees). When the engine is at No. 1 TDC the cylinder is ready for the spark plug to fire; meaning the valves should be closed

  1. Retighten the cylinder head bolts on all 3K-C engines to the proper torque specifications (please refer to the torque specifications information in Engine & Engine Overhaul in this repair guide). Also on the 3K-C, retighten the valve rocker support bolts to 13-17 ft. lbs. (18-23 Nm).
  2.  


CAUTION
Tighten all of the bolts in Step 4 in the proper sequence and stages (please refer to Engine & Engine Overhaul in this repair guide for details)

  1. Using a flat feeler gauge, check the clearance between the bottom of the rocker arm and the top of the valve stem. This measurement should correspond to the one given in the tune-up specifications chart (located earlier in this section). Check only the valves listed under " First '' in the accompanying valve arrangement illustrations for your particular engine.
  2.  
  3. If the clearance is not within specifications, the valves will require adjustment. Loosen the locknut on the other end (A-series engines usually have the locknut on the same end) of the rocker arm and, still holding the nut with an open end wrench, turn the adjustment screw to achieve the correct clearance.
  4.  
  5. Once the correct valve clearance is achieved, keep the adjustment screw from turning using your screwdriver and tighten the locknut. Recheck the valve clearances.
  6.  
  7. Turn the engine one complete revolution (80 degrees so the paired opposite cylinder to No. 1 is at TDC and No. 1 is on its exhaust stroke) and adjust the remaining valves. Repeat the necessary steps of this procedures and use the valve arrangement illustration marked " Second .''
  8.  
  9. Instal the cylinder head (camshaft/valve) cover using a new gasket.
  10.  
  11. Install the air cleaner assembly and the remaining hoses or wiring, as removed.
  12.  



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Fig. Fig. 1: Turn the crankshaft to align the timing marks and set the engine at No. 1 TDC



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Fig. Fig. 2: Checking the valve lash - all engines except A-series



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Fig. Fig. 3: Checking the valve lash on most A-series engines



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Fig. Fig. 4: Adjust these valves FIRST on the 3K-C engine



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Fig. Fig. 5: Adjust these valves SECOND on the 3K-C engine



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Fig. Fig. 6: Adjust these valves FIRST on the 2T-C and 3T-C engines



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Fig. Fig. 7: Adjust these valves SECOND on the 2T-C and 3T-C engines



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Fig. Fig. 8: Adjust these valves FIRST on A-series engines (except 4A-GE)



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Fig. Fig. 9: Adjust these valves SECOND on A-series engines (except 4A-GE)



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Fig. Fig. 10: Loosen the adjusting screw locknut (note: you should use a driver to keep the screw from turning while loosening the nut in order to preserve present adjustment)



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Fig. Fig. 11: Adjust the valve lash using a screwdriver to turn the adjusting screw and a feeler gauge to check clearance



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Fig. Fig. 12: Keep the adjusting screw from turning and tighten the locknut to secure the adjustment

1C-L DIESEL AND 4A-GE GASOLINE ENGINES



See Figures 13 through 23

  1. Start the engine and run it until it reaches normal operating temperature.
  2.  
  3. Stop the engine, then remove the air cleaner assembly.
  4.  
  5. Remove any other hoses, cables, etc. which are attached to, or in the way of the, cylinder head (camshaft/valve) cover. Remove the cylinder head cover.
  6.  


CAUTION
Be careful when removing components as the engine will be hot

  1. Use a wrench and turn the crankshaft until the notch in the pulley aligns with the timing pointer in the front cover. This will insure that the engine is at TDC.
  2.  

Check that the valve lifters on the No. 1 cylinder are loose and that those on the No. 4 cylinder are tight. If not, turn the crankshaft one complete revolution (80 degrees) and then realign the marks. When the engine is at No. 1 TDC the cylinder is ready for the spark plug to fire; meaning the valves should be closed

  1. Using a flat feeler gauge, measure the clearance between the camshaft lobe and the valve lifter. This measurement should correspond to the specification provided earlier in this section on the tune-up chart. Check only the valves listed under " First '' in the accompanying valve arrangement illustrations for your particular engine.
  2.  

If the measurement is within specifications, go on to the next step. If not, record the measurement taken for each individual valve

  1. Turn the crankshaft one complete revolution and realign the timing marks as previously described.
  2.  
  3. Measure the clearance of the valves shown in the valve arrangement illustration marked " Second .''
  4.  

If the measurement for this set of valves (and also the previous one) is within specifications, you need go no further, the procedure is finished. If not, record the measurements and continue

  1. Turn the crankshaft to position the intake camshaft lobe of the cylinder to be adjusted, upward.
  2.  
  3. Using a small screwdriver, turn the valve lifter so that the notch is easily accessible.
  4.  
  5. Install SST #09223-61510 (Diesel) or SST 09223-70012 (4A-GE) or equivalent, between the two camshaft lobes and then turn the handle so that the tool presses down both (intake and exhaust) valve lifters evenly. On the 4A-GE engine, the tool will work on only one lifter at a time.
  6.  
  7. Using a small screwdriver and a magnet, remove the valve shims.
  8.  
  9. Measure the thickness of the old shim with a micrometer. Locate that particular measurement in the Installed Shim Thickness column of the accompanying chart, then locate the already recorded measurement for that valve in the Measured Clearance column of the chart. Index the two columns to arrive at the proper replacement shim thickness.
  10.  

On Diesel engines, replacement shims are available in 25 sizes, in increments of 0.050mm (0.0020 in.), from 2.200mm (0.00866 in.) to 3.150mm (0.1149 in.). On the 4A-GE engine, shims are available from 2.500mm (0.984 in.) to 3.20mm (0.119 in.)

  1. Install the new shim, remove the special tool and then recheck the valve clearance.
  2.  
  3. Installation of the remaining components is in the reverse order of removal. Check both the ignition timing and the idle speed after installation is complete and, if necessary, adjust.
  4.  



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Fig. Fig. 13: Adjust these valves FIRST on the 1C-L engine



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Fig. Fig. 14: Adjust these valves SECOND on the 1C-L engine



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Fig. Fig. 15: Adjust these valves FIRST on the 4A-GE engine



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Fig. Fig. 16: Adjust these valves SECOND on the 4A-GE engine



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Fig. Fig. 17: A special tool must be used to depress the valve lifters - 1C-L shown



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Fig. Fig. 18: Depressing the valve lifters in order to remove the shims - 4A-GE



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Fig. Fig. 19: Use a magnet and a screwdriver to remove the old valve shims



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Fig. Fig. 20: Valve shim selection chart - 1C-L engine (In)



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Fig. Fig. 21: Valve shim selection chart - 1C-L engine (Ex)



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Fig. Fig. 22: Valve shim selection chart - 4A-GE (In)



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Fig. Fig. 23: Valve shim selection chart - 4A-GE (Ex)

 
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