Question about Chevrolet Astro
I'am gussing its a 4.3, first you have to make sure the lifter is all the way down on the cam lobe, you can acheve this by rotating the engine by hand, then you tighten the nut on the rocker down until you can bearly turn the push rod and then give it another full turn, do this same procedure on the rest and you are good to go, you do not need a torque wrench to do this just a socket and ratchet.
Posted on Sep 11, 2009
Im not sure what engine you have but adjusting the rocker arms is generally the same w/ V8 or V6.You will not need a tork wrench.You'll need a 3/8 socket wrench w/ 5/8 socket for the rckr arm nut and 1/2" socket wrench(big long wrench) w/ the socket that will fit the crank pulley bolt to manually turn the engine.Start w/the timing mark on the balancer lined up w/ 0 on the timing tab.With all of the pushrods in place and the rckr arms loosely in place put the adjusting nuts on the studs by hand just a couple turns.Your only going to adjust the rckrs w/pushrod that are the furthest down.The #1piston should be at top dead center and the #1 intake and exhaust pushrods should be both equal distance up.Adjust all rckr arms that are this far down.Rotate the engine 180 degrees(1 turn)to line the timing mark again and adjust the rest of the rcker arm nuts that werent adjusted.TIP:When youre turning the engine by hand you'll see some pushrods/rockers start to move down.when they stop moving down this is the place where they should be for adjusting and thats usually when the timing mark lines up.Now to adjust grab the pushrod you are adjusting w/thumb and index finger so you can spin and move it up and down.With 5/8 wrench in other hand start to tighten rckr nut to just where you cannot freely spin or move up and down the push rod(zero lash).Then for final adjustment tighten the rckr nut 1/2 turn.Do this to only the pushrods that are all the way down,turn the engine once and adjust the remaining rckr nuts
Posted on Sep 11, 2009
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Posted on Jan 02, 2017
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