Toyota Corolla 1970-1987 Repair Guide

Camshaft

Print

REMOVAL & INSTALLATION



K-Series and T-Series Engines

See Figures 1 and 2

  1. Remove the cylinder head from the vehicle. For details, please refer to the procedure located earlier in this section.
  2.  
  3. Matchmark and remove the distributor.
  4.  
  5. Remove the radiator.
  6.  
  7. Remove the timing chain as detailed previously.
  8.  
  9. Remove the valve lifters in the proper sequence. Be sure to tag or arrange all valve train components in order to assure installation in their original locations.
  10.  
  11. Remove the fuel pump.
  12.  
  13. Remove the two thrust plate set bolts.
  14.  



Click image to see an enlarged view

Fig. Fig. 1: Use a cylinder headbolt to remove and install the camshaft



Click image to see an enlarged view

Fig. Fig. 2: Proper positioning of the thrust plate-K-series engines

  1. Screw a cylinder head bolt into the end of the camshaft. Slowly turn the camshaft and withdraw it out being careful not to damage the bearings.
  2.  

To install:
  1. Inspect the camshaft and bearings for damage.
  2.  
  3. Coat the camshaft bearings and journals lightly with oil, then carefully install the camshaft into the cylinder block.
  4.  
  5. Install the thrust plate in the proper position and torque the two bolts to 4-6 ft. lbs. (5-8 Nm) on K-series engines and 7-11 ft. lbs. (9-15 Nm) on T-series engines.
  6.  
  7. Installation of the remaining components is in the reverse order of removal.
  8.  

A-Series Engines (SOHC)

See Figures 3 through 12

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the cylinder head cover.
  4.  
  5. Remove the rocker arm and shaft assembly.
  6.  
  7. Loosen the bolts and pull the fuel pump back from the cylinder head. Support the fuel pump, just out of position.
  8.  

Whenever the timing belt is disturbed, it is a good idea to first set the engine to No. 1 TDC in order to align the timing marks and make an easy reference for installation

  1. Matchmark the timing belt to the camshaft timing pulley.
  2.  
  3. If equipped, remove the plug in the end of the timing cover for access to the camshaft pulley bolt. If not equipped with an access plug, the front timing cover must be removed.
  4.  
  5. Use safety wire to support the pulley in position, keeping the belt sufficiently taught in order to hold the belt teeth to the crankshaft and camshaft pulleys.
  6.  



Click image to see an enlarged view

Fig. Fig. 3: Removing the camshaft timing pulley retainer



Click image to see an enlarged view

Fig. Fig. 4: Loosen the camshaft bearing caps using gradually passes of this sequence-SOHC A-series engines



Click image to see an enlarged view

Fig. Fig. 5: Tighten the camshaft bearing caps using multiple passes of this sequence-SOHC A-series engines

  1. Separate the timing pulley from the camshaft. To accomplish this, hold the shaft flats with a pair of channel lock pliers and remove the bolt in the pulley end of the shaft.
  2.  

Never hold the camshaft on the lobes, as damage will result

  1. If necessary, secure the camshaft with channel locks once again and loosen the distributor drive gear bolt.
  2.  
  3. Loosen each bearing cap bolt a little at a time using multiple passes of the proper sequence. Make sure that you keep the bearing caps in the proper order.
  4.  
  5. Remove the camshaft and oil seal.
  6.  
  7. If necessary for replacement, remove the oil seal from the end of the shaft.
  8.  

To install:
  1. Apply grease to the inside edge of the oil seal and liquid sealant to the outside edge, then slip the seal onto the camshaft.
  2.  

Be careful not to install the oil seal onto the camshaft crooked

  1. Install the camshaft and oil seal to the cylinder head.
  2.  
  3. If removed, install the distributor drive gear and the plate washer with the bolt onto the camshaft.
  4.  
  5. Coat all bearing journals lightly with oil, then place the camshaft into position in the head.
  6.  
  7. Place the bearing caps Nos. 2, 3 and 4 on each journal with the arrows pointing toward the front of the engine.
  8.  
  9. Apply liquid sealant to the two bottom edges of the No. 1 bearing cap then install it into position.
  10.  
  11. Torque each bearing cap bolt a little at a time using passes in the proper sequence. Tighten to 8-10 ft. lbs. (11-14 Nm).
  12.  
  13. Recheck the thrust clearance, then if removed, tighten the distributor drive gear bolt to 20-23 ft. lbs. (27-31 Nm).
  14.  
  15. Install the timing pulley and belt to the camshaft, making sure that all marks are in alignment. The timing belt must have been kept taught to assure the belt did not jump a tooth of the crankshaft pulley.
  16.  
  17. Reposition and secure the fuel pump.
  18.  
  19. Install the access cover or the timing cover, as applicable.
  20.  
  21. Install the rocker arm and shaft assembly. Check and adjust the valve clearances, but remember that they must be adjusted hot. In order to do this, temporarily install the cylinder head cover and connect the negative battery cable so the engine may be run.
  22.  
  23. After proper valve clearance has been verified, install the cylinder head cover.
  24.  
  25. Connect the negative battery cable.
  26.  



Click image to see an enlarged view

Fig. Fig. 6: If equipped, remove the end plug (access cover) from the engine timing cover



Click image to see an enlarged view

Fig. Fig. 7: Keep the camshaft from turning using a wrench or pliers on the provided flats



Click image to see an enlarged view

Fig. Fig. 8: Loosen and remove the pulley retaining bolt (NOTE the belt is matchmarked to a pulley tooth)



Click image to see an enlarged view

Fig. Fig. 9: Loosen the retainers and remove the camshaft bearing caps



Click image to see an enlarged view

Fig. Fig. 10: Lift the camshaft and, if necessary, remove the oil seal



Click image to see an enlarged view

Fig. Fig. 11: Remove the camshaft from the cylinder head



Click image to see an enlarged view

Fig. Fig. 12: During installation, be sure to face the bearing cap arrows towards the front of the engine

4A-GE Engine

See Figures 13, 14, 15 and 16

  1. Remove the cylinder head cover.
  2.  
  3. Remove the engine front covers.
  4.  
  5. Make certain the engine is set to TDC/compression on No.1 cylinder. Remove the timing belt following procedures outlined earlier in this section.
  6.  
  7. Remove the crankshaft pulley.
  8.  
  9. Remove the camshaft timing belt pulleys.
  10.  
  11. Loosen and remove the camshaft bearing caps in the proper sequence. It is recommended that the bolts be loosened in two or three passes.
  12.  



Click image to see an enlarged view

Fig. Fig. 13: Camshaft bearing cap removal sequence-4A-GE engine



Click image to see an enlarged view

Fig. Fig. 14: Camshaft bearing cap installation sequence-4A-GE engine

  1. With the bearing caps removed, the camshaft(s) may be lifted clear of the head. If both cams are to be removed, label them clearly-they are not interchangeable.
  2.  

Handle the camshaft with care. Do not allow it to fall or hit objects, as it may break into pieces

To install:
  1. Lubricate the camshaft lobes and journals with clean engine oil.
  2.  
  3. Place the camshaft(s) in position on the head. The exhaust cam has the distributor drive gear on it. Observe the markings on the bearing caps and place them according to their numbered positions. The arrow should point to the front of the engine.
  4.  



Click image to see an enlarged view

Fig. Fig. 15: Examples of marking on camshaft bearing caps. Note that the bearing cap on the right is for position No. 1 only-4A-GE engine



Click image to see an enlarged view

Fig. Fig. 16: Correct position of knock pins, the exhaust camshaft has the distributor drive gear-4A-GE engine

  1. Tighten the bearing cap bolts in the correct sequence and in three passes to a final tightness of 9 ft. lbs. (12 Nm).
  2.  
  3. Position the camshafts so that the guide pins (knock pins) are in the proper position. This step is critical to the correct valve timing of the engine.
  4.  
  5. Install the camshaft timing pulleys and tighten the bolts to 43 ft. lbs. (58 Nm).
  6.  
  7. Double check the positioning of the camshaft pulleys and the guide pin.
  8.  
  9. Install the crankshaft pulley. Tighten its bolt to 101 ft. lbs. (137 Nm) and double check its position to be on TDC.
  10.  
  11. Install the timing belt and tensioner. Adjust the belt according to procedures outlined.
  12.  
  13. Install the engine front timing covers.
  14.  
  15. Install the cylinder head cover.
  16.  

1C-L Diesel

See Figure 17

  1. Perform the necessary steps of the cylinder head removal & installation procedure in order to remove the cylinder head cover, rocker arm assemblies and timing belt. If necessary, refer to the other procedures in this section for more details.
  2.  
  3. Remove the exhaust manifold.
  4.  
  5. Remove the camshaft oil seal retainer.
  6.  
  7. Loosen each bearing cap bolt a little at a time and in the proper sequence (starting at the ends and working inward). Make sure that the bearing caps are kept in the proper order.
  8.  
  9. Remove the camshaft and the half-circle plug at the rear of the head.
  10.  

To install:
  1. Coat the half-circle plug with adhesive and position it in the cylinder head.
  2.  
  3. Coat all bearing journals lightly with oil, then place the camshaft into position on the cylinder head.
  4.  



Click image to see an enlarged view

Fig. Fig. 17: When installing the camshaft oil seal retainer, apply a coat of sealant to prevent leakage-1C-L engine

  1. Install the bearing caps in order. Tighten the cap bolts in two or three stages (starting at the center and working outward) until they reach a final torque of 13 ft. lbs. (18 Nm).
  2.  
  3. Check the thrust and oil clearances.
  4.  
  5. Apply adhesive to the oil seal retainer as shown, then install it onto the cylinder head.
  6.  
  7. Installation of the remaining components is in the reverse order of removal.
  8.  

CHECKING



See Figures 18 through 22

  1. Using a micrometer, check that the camshaft journal diameter is within specification (according to the figures listed in the camshaft specifications chart).
  2.  
  3. Check the bearing oil clearance:
    1. On K-series and T-series engines, check the bearing bore with a cylinder micrometer. Subtract the journal diameter measurement taken in Step 1 from the bearing bore measurement. If the clearance is greater than specification, replace the bearing and/or camshaft.
    2.  
    3. On the 1C-L and all A-series engines, clean the bearing caps and camshaft journals. With the camshaft in position in the cylinder head, lay a strip of Plastigage® or an equivlanet gauging material; across each journal, then install the bearing caps and torque them down in the proper sequence.

      Click image to see an enlarged view

      Fig. Fig. 18: Use a micrometer to measure the camshaft journal diameters



      Click image to see an enlarged view

      Fig. Fig. 19: On K-series and T-series engines, use a cylinder micrometer to check the bearing bore



      Click image to see an enlarged view

      Fig. Fig. 20: On overhead camshaft engines such as the 1C-L diesel and all A-series engines, use the scale provided with the gauging material to determine bearing clearance

      Never turn the camshaft with the Plastigage® in place. Remove the bearing caps and compare the Plastigage® to the scale included in the package. If the clearance at the widest point of any strip is greater than specification, replacement of the camshaft or the cylinder head is required
    4.  

  4.  
  5. Check the camshaft end-play:
    1. On chain driven engines, install the thrust plate and camshaft sprocket to the camshaft. Tighten to 40-47 ft. lbs. (54-64 Nm). Using a feeler gauge, measure the clearance between the camshaft and the thrust plate. If the clearance is greater than specification, replace the thrust plate and/or sprocket.
    2.  
    3. On belt driven engines, attach a dial indicator to the cylinder head so that its tip is touching the end of the installed camshaft. Lever the camshaft back and forth. If the measurement is greater than specification, replace the camshaft, cylinder head or, if equipped, the thrust bearing.

      Click image to see an enlarged view

      Fig. Fig. 21: On K-series and T-series engines, use a feeler gauge to determine shaft end-play when bolted to the sprocket



      Click image to see an enlarged view

      Fig. Fig. 22: On overhead camshaft engines, mount a dial gauge to read end-play when carefully prying the installed camshaft back and forth