Question about 2003 Toyota Corolla
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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Posted on Jan 02, 2017
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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.
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).
Fig. Fig. 1: Check the valve clearance with a flat feeler gauge-Z24i engine
Fig. Fig. 2: Loosen the locknut and turn the adjusting screw to adjust the valve clearance-Z24i engine
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
Fig. Fig. 4: Cross-sectional view of an installed hydraulic valve lifter-4 cylinder engine
Fig. Fig. 5: Cross-sectional view of an installed hydraulic valve lifter-6 cylinder engine
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