Question about GMC S-15
For hydrolic lifters turn engine over until both valves on the cyl. your doing are completly closed, if rocker is tight after you do this loosen it until you can wiggle it and then tighten it down until you just can't wiggle it, and then give it another 1/2 to 3/4 of a turn more and thats it, repete this process on the rest of the cyl. and valves and you got it if you still have lifter or rocker noise after you do this find witch one it is and tighten it a little more . If it happens to be solid lifters you will need a feeler guage in thousands and know the setting for each valve, and its the same process except you use the guage between the rocker and top of valve to set the lash.
Posted on Apr 13, 2009
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Posted on Jan 02, 2017
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Sep 12, 2013 | Cars & Trucks
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Check the condition and tension of all drive belts every 12,000 miles, or at least once a year. Loose drive belts can lead to poor engine cooling and diminished alternator, power steering pump, air conditioning compressor, or emission air pump output. A belt that is too tight places a strain on the bearings in the driven component.
Fig. Fig. 5: Installing too wide a belt can result in serious belt wear and/or breakage
Replace any drive belt that is glazed, worn, cracked, or stretched to the point where correct adjustment tension is impossible. If two belts are used to drive a component, always replace both belts when replacement is necessary. After installing a new belt, run the engine for ten minutes, shut OFF the engine and recheck the belt tension. Readjust if necessary.
Fig. Fig. 10: Engine belt tension chart-1994-95 models
Two popular methods of checking drive belt adjustment are; the Belt Tension Gauge Method and the Belt Deflection Method. The former requires a special gauge and the latter requires a straight edge and scale or just a good eye for measurement. The deflection method will be used in the following belt replacement instructions. A rule of thumb for checking belt tension by the deflection method is to determine the midpoint between two pulleys of the drive belt and press down at that point with moderate thumb pressure. The belt should deflect to the measurement indicated in the following installation procedures. Adjustment is necessary if the belt is either too loose or too tight.
WARNING A belt adjustment which is either too loose or too tight will eventually damage the accessory that belt is driving. A too loose adjustment allows free-play in the belt which could transfer a whipping motion or shock to the accessory drive pulley. Similarly, a belt which is too tight will preload the accessory bearings, leading to early failure.
Fig. Fig. 14: Removing the A/C compressor drive belt from under the vehicle
Fig. Fig. 16: Loosening the locking screw for alternator drive belt removal
If removal of the alternator belt is required, the A/C belt must first be removed.
Fig. Fig. 17: Air pump belt adjustment-2.2L engines
When servicing the air pump, use the square holes provided in the pulley to prevent camshaft rotation.
Fig. Fig. 18: Drive belt adjustment points-2.5L engines
Fig. Fig. 19: Drive belt adjustment points-2.6L engines
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