Buick 10089648 Arm Kit,Valve Rocker

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To remove and install the rocker arms on 4.5L and 4.9L engines, start by disconnecting the negative battery cable and removing the air cleaner and AIR management valve. Remove the MAP hose from the throttle body and the right side spark plug wires and conduit. Remove the fuel vapor canister pipe bracket and drain the cooling system. Remove the heater hose and brake booster vacuum hose from the intake manifold. Then, remove the rocker arm cover, gasket seals, rocker arms, and rocker arm support. Clean the gasket mounting surfaces and inspect for wear or damage. To install, lubricate the parts with clean engine oil and use a new gasket with RTV sealant. Install the rocker arms and pivots, tighten the pivot bolts, and place each pushrod into the rocker arm seat. Install the rocker arm support, retaining nuts and bolts, rocker arm cover seals, and rocker arm cover. Connect the brake booster vacuum hose and spark plug wires. Install the air management and bracket assembly, replace the heater hose and air cleaner assembly, and connect the negative battery cable. Finally, start the engine and check for leaks. For the left side, follow similar steps, including removing the power steering pump, belt tensioner, and bracket assembly. Replace the accessory drive belt and reinstall the power steering pump, throttle return spring, PCV valve, air cleaner, and negative battery cable.

To remove the valve covers, start by detaching them from the cylinder heads. Proceed to loosen and remove the rocker arm stud nuts, starting at the front of one cylinder head. Store these nuts separately in marked containers to ensure proper reinstallation. For models through 1998, if only the pushrods need removal, loosen each nut just enough to rotate the rocker arms aside for pushrod removal. In 2000 and later models, roller-rocker arms are retained by bolts instead of pivot balls. Lift off the rocker arms and pivot balls, and store them with the nuts for later reinstallation. Remove the pushrods and store them separately to avoid mixing them up during installation, utilizing a perforated cardboard box for organized storage. Inspect each rocker arm for wear, cracks, and damage, focusing on the areas where pushrods and valve stems contact the rocker arm faces. Ensure the hole at the pushrod end of each rocker arm is open and check the rocker arm pivot area for wear, cracks, and galling. If any rocker arms are worn or damaged, replace them along with new pivot balls, especially on 2000 and later models with roller rocker arms. Inspect the pushrods for cracks and excessive wear, checking for bending by rolling them on a flat surface. To install, lubricate the lower end of each pushrod with clean engine oil or moly-base grease, seat them in their original lifter positions, and apply moly-base grease to valve stem and pushrod ends before positioning the rocker arms over the studs. Install pivot balls and nuts, ensuring the flat side of each nut faces the pivot ball. Tighten the rocker arm nuts. Reassemble the remaining components in reverse order, starting the engine and checking for valve cover leaks and valvetrain noise. Note that valve adjustment is not required for most models; however, specific instructions for valve adjustment on 1994 VIN Z engines are provided, involving setting the engine to TDC, aligning timing marks, and adjusting rocker arm nuts for specified valves at TDC for each cylinder.

To inspect and remove rocker arms and pushrods, begin by detaching the valve cover from the cylinder head. When removing them, it's crucial to ensure that a specific cylinder is at Top Dead Center (TDC), and the lifters for that cylinder are on the base circle of the camshaft. Rotate the crankshaft to position the piston at its highest point using a plastic pen in the spark plug hole to indicate TDC. Loosen the rocker arm bolts and remove the rocker arm nuts, rocker arms, and pivot balls while carefully storing them in marked containers. For pushrod removal, rotate the rocker arms aside to facilitate pushrod extraction. Additionally, pay attention to pushrod guides if they need to be removed, marking them for proper reinstallation. Examine rocker arms for wear, cracks, and damage, especially where they contact pushrods and valve stems. Ensure that the pushrod-end hole in each rocker arm is open and inspect the rocker arm pivot area for wear, cracks, and galling. Replace worn or damaged rocker arms and use new pivot balls if needed. Lubricate pushrod lower ends with engine oil or moly-base grease, install them in their original locations, and ensure they seat properly in the lifter socket. Apply moly-base grease to valve stem ends and upper pushrod ends before positioning rocker arms and installing bolts. Place rocker arms, install pivot balls and bolts, and tighten rocker arm nuts, taking care to tighten them when there is no valve spring load on the rocker arm. On later models, align the tab on the roller rocker pivot with the slot in the cylinder head casting protrusion. After tightening the rocker arms, reinstall the valve cover, start the engine, and check for oil leaks or valvetrain noises.

Cracks, excessive wear, and bending.

Store them orderly.

The pushrods should be inspected for cracks, excessive wear, and bending.

Reassemble the remaining components in reverse order.

The first step is to detach the valve cover from the cylinder head to access the rocker arms and pushrods.

Apply moly-base grease to valve stem and pushrod ends before positioning the rocker arms over the studs.

Also, inspect the rocker arm pivot support pedestal for cracks. Ensure the hole at the pushrod end of each rocker arm is open and check the pushrods for cracks, excessive wear, and clogged oil holes.

To determine if a cylinder is at TDC, rotate the crankshaft until the piston is at its highest point, and use a plastic pen in the spark plug hole to indicate TDC.

To determine if a cylinder is at TDC, rotate the crankshaft until the piston is at its highest point, and use a plastic pen in the spark plug hole to indicate TDC.

Finally, install the valve covers, start the engine, listen for unusual valve train noise, and check for oil leaks.

After the installation, the engine should be started and checked for leaks and valvetrain noise.