GMC 10241740 Rod Assembly, Valve Push

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To remove the valve covers, first detach them from the cylinder heads. Proceed by loosening and removing rocker arm stud nuts, starting from the front of one cylinder head. Keep these nuts in separate containers that are labeled so you can put them back correctly. On 1998 models and prior ones, in case only pushrods have to be removed, loosen each nut just enough to enable you rotate the rocker arms out of the way for pushrod removal. Instead of using pivot balls, roller-rocker arms on model year 2000 and later are retained by bolts. Put away rocker arms and pivot balls with nuts for reinstallation later on. Take out pushrods and keep them apart to avoid mix up during installation utilizing a perforated cardboard box which allows organized storage. Examine each rocker arm for wear, cracks or any other damage focusing on areas where rocker arm faces contact with pushrods and valve stems. Make sure that hole at the pushrod end of each rocker arm is open and inspect rocker arm pivot area for wear, cracks or galling. In particular, replace all worn roller rocker arms along with new pivot balls on 2000 and newer models. Check whether there are cracks or excessive wear on pushrods by rolling them on a flat surface to see if they are bent. To install, lubricate lower end of every single pushrod using clean engine oil or moly-base grease; seat in their original lifter positions; apply moly-base grease to valve stems as well as pushrod ends before placing the rocker arms over studs. Install pivot balls and nuts making sure that flat side of each nut faces pivot ball. Tighten down the rocker arm nuts properly. Reverse order reassemble remaining components; start engine then check for valve cover leaks as well as valvetrain noise (Haines). Note too that most models do not require a valve adjustment except specific instructions provided here for valve adjustment on 1994 VIN Z engines including setting the engine to TDC, aligning timing marks, and adjusting rocker arm nuts for specified valves at TDC for each cylinder.

First, remove the valve cover from the cylinder head to inspect and take out rocker arms and pushrods. It is important to make sure that a specific cylinder is at Top Dead Center (TDC) and that the lifters for this cylinder are on base circle of camshaft when removing them. To show TDC, use a plastic pen through the spark plug hole to raise piston on its highest point by rotating the crankshaft. Loosen rocker arm bolts, take off rocker arm nuts, rocker arms and pivot balls ensuring they are carefully stored in marked containers. Rotate the rocker arms aside for an easy pushrod removal. Also, don't forget about the pushrod guides if necessary remove them marking them for proper reinstallation. Look for wear, cracks, or damage especially where they contact with pushrods and valve stems on rocker arms. Inspect the rocker arm pivot area for wear, cracks or galling and make sure that each rocker arm has an open pushrod-end hole. Replace damaged or worn out rocker arms with new pivot balls as required. Lubricate lower ends of pushrods with engine oil or moly-based grease before installing them into their original locations and checking that they sit properly in lifter socket. Apply moly-based grease on valve stem ends and upper pushrod ends before positioning you're your installing bolts for aileron activator. With care, install pivot balls and bolts then tighten rocker arm nuts while no valve spring load is present on it; replace retainer bolt hand-tight before torquing down to specified amounts using a torque wrench set at 14-15 lb-ft; replace retainer bolt hand-tight before torquing down to specified amounts using a torque wrench set at 14-15 lb-ft. In later models align tab on roller rocket pivot with slot in cylinder head casting protrusion; reinstall valve cover after tightening rocker arms then check for oil leaks or valve train noises after starting the engine.

You can start by removing the rocker arms, which will be loosened and stored in containers labeled as rocker arm support bars. Keep their different pushrods separately. If necessary, inspect each rocker arm for damage on the pivoting area and cracks or wear on the bearing surface; after that replace any defective ones, making sure roller bearings rotate freely. Look at the pushrods to see if they have cracks, are too worn out or bent. For reinstalling, lube the push rods and put them back into their original position with full seating in the lifter being noted. After that, place back the rocker arm support with arrows up and also wipe off grease from valve stems and ends of pushrods. Then fit all rocker arms one by one, lubricating roller bearings lightly and tightening the rocker arm bolts evenly according to a specified torque. Lastly, you can start your engine up and check it for oil leaks or noises from the valve train mechanism.

Detach the rocker arm covers from the cylinder heads.

Cracks, excessive wear, and bending.

Apply clean engine oil to the pivot shaft and bearing of each rocker arm and loosely install them in their original locations.

The pushrods should be removed separately to avoid mixing them up.

Keep track of their positions and store them separately.