Question about 1998 Toyota Tacoma
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Posted on Jan 02, 2017
SOURCE: 1983 toyota 22r/2.4 had head
Hi, I dont think that neither will cause the valves to get bend ,if the cam is 180 degrees out piston 1 and 4 are up at the same time,so if the timing chain is on the marks , pistons should not hit the valves,I think the timing chain was out one or more teth the first time you try to start the angine..C1
Posted on Dec 01, 2008
simple to figure that out . the key ways are always up on camshafts. it allows for them not to fall out when assembling the engine . so use the balancer to determine tdc (top dead center on cyl one) and make sure both keys are straight up . (just loosen the cam retainer nuts and look to see what set of marks they line up with and dont forget t re-torque them to factory specs somewhere between 22 and 28 ft lbs but not a lot more) , google the specs up to be sure
Posted on Oct 29, 2009
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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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