Question about 1997 Chevrolet Malibu
We just put in a new engine and the only thing holding us up is the valve clearance. Can't seem to find info anywhere. If you know please let us know.
I don't know of any chevy engines that run a solid lifter cam.(Which would require clearance specs) If it has either a common rail on which the rockers all are attached, or if the rockers are attached in pairs, on "bridges" Just put it together and let it fly. If each rocker is on an individual stud, common adjustment is to run the adjusting nuts down till the pushrods can be just turned with your fingers (any cam lobe that is in the "up position requires that you turn the engine by hand so you can do this with rocker "relaxed") After doing this, run the engine and slowly turn back each adjustment till it starts clacking. then turn back down till quiet, then 1/4-1/2 turn further down. Lots of oil may be spraying all over the place while doing this so take care not to start any fires. There are items available to cut down on this, but youd have to check with parts supplier to see what they have.
Posted on Jan 13, 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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