Buick 10159551 Cylinder Head & Stud ASSEMBLY

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Clean the cylinder heads thoroughly and its related valve train components, removing old gasket material from the head gasket, along with sealing compound at the intake manifold and exhaust manifold sealing surfaces. Clear away scale buildup in the coolant passages and clean out via wire brush all kinds of holes as well as threaded holes. With a solvent wash down, completely dry cleaner rocker arm pivot stud threads, cylinder head, rocker arms push rods, spring retainers plus keepers, valve springs shields. The valves can be scraped to get rid of heavy deposits while the valve heads' epidermis can be cleaned free of deposit through electrically driven wire brushes. Examine for cracks in coolant wairs or warping. The condition of valves seating stem guide clearance faces spring wear retainers and covers end pivots are checked out for wear damage or proper installation by measuring margin width on spring seats as well as blade contact area between two adjacent rockers push rod ends bolted stud guide plates pull rods arm nuts studs are observed at every opportunity if broken replace them. For poor conditions reassemble valve parts into cylinder head: however for good conditions, reassemble them without major service operations performed on the same parts again.

Disconnect the cable from the negative battery terminal and raise the vehicle securely on jackstands. Locate the engine block drain plugs at the rear of the motor mounts, remove them, and drain the block. Disconnect the exhaust pipe from the exhaust manifold and remove the oil dipstick tube assembly from the engine side. Remove the jackstands and lower the vehicle, then take out the intake manifold and the exhaust manifold. Without disconnecting the hoses, remove the power steering pump and its bracket from the cylinder head, and do the same for the air conditioning compressor and its bracket without disconnecting the refrigerant lines. Remove the coolant temperature sending unit from the front of the cylinder head, loosen the rocker arm nuts to allow for pushrod removal, and then take out the pushrods, ensuring they are stored separately for reinstallation. Loosen the head bolts in the opposite sequence of tightening, then remove the cylinder head by breaking the gasket seal with a bar inserted into one of the exhaust ports. Ensure the gasket surfaces of both the head and engine block are clean and free of nicks and scratches, and that the threads in the block and on the head bolts are clean. Position the gasket over the locating dowels with the note "This Side Up" visible, then place the cylinder head over the gasket. Coat the cylinder head bolts with an appropriate thread sealer, install them, and tighten in the proper sequence to the specified torque, working up to the final torque in three steps. Install the pushrods, ensuring the lower ends are in the lifter seats, place the rocker arm ends over the pushrods, and loosely install the rocker arm nuts. The remaining installation steps are the reverse of removal, and before installing the rocker arm covers, adjust the valve lash. For the right side, repeat the initial steps of disconnecting the negative battery terminal, locating and draining the engine block, disconnecting the exhaust pipe, and lowering the vehicle. Remove the intake manifold, alternator, and its bracket, as well as the lifting eye from the rear of the head if replacing it. Remove the exhaust manifold, loosen the rocker arm nuts to remove the pushrods, and loosen the head bolts in the opposite sequence of tightening. Remove the cylinder head by breaking the gasket seal with a bar inserted into one of the exhaust ports, and follow the installation steps outlined previously.

Some specialized tools are necessary for the disassembly and inspection procedures, and replacement parts may not be readily available.

The first step is to ensure the heads are clean before reassembly, regardless of whether they underwent valve servicing at an automotive machine shop.

When lifting the heads off the engine, use caution, and if resistance is encountered, avoid prying between the head and block to prevent damage to mating surfaces. Instead, use a block of wood and a hammer to dislodge the heads.

Ensure there is no oil on the mating surfaces, as it may lead to improper gasket sealing and potential leaks.

If they are in good condition, reassemble the valve train components in the cylinder head without major servicing.

New and rebuilt cylinder heads are commonly available at dealerships and auto parts stores.

Begin by lubricating and installing the first valve, applying moly-base grease or clean engine oil to the valve stem.

Loosen each cylinder head mounting bolt one turn at a time in reverse of the tightening sequence until they can be removed, noting the length and position of each bolt for correct reinstallation.

Disassembly involves removing the intake and exhaust valves along with their related components. If they are still in place, the nuts or bolts and pivot balls should be removed to separate the rocker arms from the cylinder head, with all parts labeled or stored separately for reinstallation.

Coat the valve stems with clean moly-based grease or engine assembly lube before installing the valves, taking care not to damage the new valve guide seals.

Install the pushrods, ensuring the lower ends are in the lifter seats, place the rocker arm ends over the pushrods, and loosely install the rocker arm nuts.

Measure the valve stem diameter at three points, noting that exhaust valves have tapered stems.