Question about 2003 Toyota Corolla

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Noisy cylinder head

What is the proper procedure of adjusting valves on Vvt-i Toyota Vios 2003 model engine?. Do I need to lap or grind the valve stem?. On old engine, using feeler gauge is enough, can we do the same with this car?. Thank you. Ed

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  • edgyona Oct 18, 2008

    During cold engine start, RPM run 2000 and very slowly it settle down to 800 RPM. I am afraid that this will cause engine damage. Where is the idling mechanism located?, Thanks. Ed

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  • Toyota Master
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These valves are not adjustable, they are hydraulic design. If they are noisy then there is a problem with the followers.

Posted on Oct 14, 2008

  • yadayada
    yadayada Oct 18, 2008

    That is normal cold start high idle, if it didn't idle fast the engine would stall, idle is not adjustable, it is computer controlled through and automatic idle spped control valve.

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What are the valve clearances for a 2e 12 valve engine?


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There is a tapping noise in the motor but its not knocking I think its a lifter it hasent lost any power and its really not getting worse I would like to know what the spec is for tighing down the lifter...


Depends on which engine you have. If you have


ADJUSTMENT Although it is sometimes possible to reuse an old cylinder head cover gasket, in most cases it makes more sense to purchase a new one before beginning the procedure. Some vehicles may require the use of silicone sealant either with or without a new cover gasket. For more details, please refer to the cylinder head cover procedures in Engine & Engine Overhaul of this repair guide and refer to the gasket manufacturer's instructions.

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See Figures 1, 2 and 3
For the intake valves: 1-4-5-8 valve clearance is 0.012 in. (0.30mm). For the exhaust valves: 2-3-6-7 valve clearance is 0.012 in. (0.30mm). The pivot locknut torque specification is 12-16 ft. lbs. (16-22 Nm).

  1. The valves must be adjusted with the engine warm, so start the truck and run the engine until the needle on the temperature gauge reaches the middle setting. After the engine is warm, shut it off.
  2. Note the location of any wires and hoses which may interfere with cylinder head cover removal, disconnect them and move them to one side. Remove the bolts holding the cylinder head cover in place and remove the cover. Remember, the engine will be hot, so be careful!

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Fig. Fig. 1: Check the valve clearance with a flat feeler gauge-Z24i engine





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Fig. Fig. 2: Loosen the locknut and turn the adjusting screw to adjust the valve clearance-Z24i engine


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Fig. Fig. 3: With the No. 1 piston at TDC, adjust the top set of valves FIRST; with the No. 4 piston at TDC, adjust the bottom set of valves SECOND-Z24i engine

  1. Rotate the crankshaft until the timing marks indicate that the No. 1 piston is at TDC of the compression stroke. If you're not sure of which stroke you're on, remove the No. 1 spark plug and hold your thumb over the hole. Pressure will be felt as the piston starts up on the compression stroke.
  2. Refer to the accompanying illustration (upper part), then check valves (1), (2), (4) and (6) using a flat bladed feeler gauge. The feeler gauge should pass between the valve stem end and the rocker arm screw with a very slight drag. Insert the feeler gauge straight, not at an angle.
  3. If the clearance is not within the specified value, loosen the rocker arm lock nut and turn the rocker arm screw to obtain the proper clearance. After correct clearance is obtained, tighten the locknut.
  4. Rotate the crankshaft until the timing marks indicate that the No. 4 piston is at TDC of the compression stroke. If you're not sure of which stroke you're on, remove the No. 4 spark plug and hold your thumb over the hole. Pressure will be felt as the piston starts up on the compression stroke.
  5. See the illustration (lower part), then check valves (3), (5), (7) and (8). Check and adjust valve clearance as necessary.
  6. Install the cylinder head cover gasket, the cover itself and any wires or hoses which were removed. Check the engine oil level.

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See Figures 4 and 5
These models utilize hydraulic valve lifters. Periodic adjustment is neither necessary or possible. There is however a bleed down procedure that is necessary when the valve train has been disassembled.
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  1. Remove the cylinder head cover.
  2. Check the lifters for proper operation by pushing hard on each lifter with fingertip pressure.
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  4. Install the cylinder head cover.
  5. If there was air in the lifters, bleed the air by running the engine at 1000 rpm for 10 minutes.


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Fig. Fig. 4: Cross-sectional view of an installed hydraulic valve lifter-4 cylinder engine


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Fig. Fig. 5: Cross-sectional view of an installed hydraulic valve lifter-6 cylinder engine

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  1. Disconnect the negative battery terminal.
  2. Remove the valve cover, using the proper procedures.
  3. Remove the camshaft, shims and rockers, if equipped, using the proper procedures.
  4. Remove the spark plugs.
  5. Rotate the engine to Top Dead Center (TDC) for each cylinder's seals that are being replaced; e.g., if replacing the No. 2 cylinder valve seals, have the No. 2 cylinder at TDC. Use a coat hanger put down into the cylinder to determine when it is at TDC.
  6. Attach a fixture at the flywheel or the front of the engine to prevent the engine from rotating. Make sure the fixture damages no components.
  7. Thread an adapter into the spark plug holes that can be hooked up to a shop compressor air hose.
  8. Apply 90 psi of shop compressor air to the adapter hose. This is done to keep the valves from dropping down into the cylinder when the valve springs are removed.
CAUTIONTo avoid personal injury, wear eye and ear protection. Keep hands and clothing away from engine parts that rotate, in case the engine does rotate from the cylinder air pressure.
  1. With the cylinder under pressure, remove the valve spring retainer and the spring, using a spring compressor tool. Hitting the spring retainer with a soft hammer may help loosen the valve keepers, if the keeper will not move downward when trying to compress the spring.
  2. With the valve spring removed, remove the oil seal.
To Install:
  1. Install a new seal, using Toyota Special Service Tool (SST) 09201-41020, or equivalent.
  2. Reinstall the valve springs (See Valves).
  3. Release the air pressure and reverse the removal procedures to complete installation.
  4. Connect the negative battery terminal, start the engine and check for leaks.
0900c15280046373.jpgFig. 1 Removing the valve sealsCelica 0900c15280046378.jpgFig. 2 Intake and exhaust valve sealsCelica 0900c15280046379.jpgFig. 3 Installing the valve sealsCelicaWith Cylinder Head Off Engine
  1. Disconnect the negative battery terminal.
  2. Remove the cylinder head, using the proper procedures.
  3. Remove the valve and spring (See Valves).
  4. Remove the oil seal.
To Install:
  1. Install a new seal, using Toyota Special Service Tool (SST) 09201-41020, or equivalent.
  2. Reinstall the removed components to complete installation.
  3. Connect the negative battery terminal, start the engine and check for leaks.

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