Jeep 5143397AB Head-Cylinder

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Just before starting, make sure the engine is completely cold. To begin removing the above, be careful not to move crankshaft position alignment marks and remove primary timing chain and sprockets. Proceed by taking camshafts off from cylinder head, then remove rocker arms and hydraulic lash adjusters and label them for reinstalling on the same valves they were removed from. Remove the lower intake manifold as well as any exhaust manifold(s), labeling and removing other components still attached to the cylinder head. Unscrew evenly all head bolts by turning each one One-quarter turn at a time until you reach break away torque so as to avoid warping or cracking the heads. Lift out the cylinder head with exhaust manifold still attached, prying it up at trans end just beyond the gasket surface if stuck. For thorough cleaning of a cylinder head before taking it to an automotive machine shop apply this procedure; send it to an automotive machine shop after stripping all external components from a cylinder head. Ensure that mating surfaces of a block and a cylinder head are spotlessly clean before installation. Carbon and old gaskets can be scraped off using a gasket scraper; wipe surfaces with lacquer thinner or acetone knowing oil should not be present thereon when mating takes place. Examine both block and head surfaces for damage, tap threads in head bolt holes, check each bolt for stretching on every cylinder-head bolt hole size plays a significant role in determining proper clamp load during assembly process after re-tapping each of them . Check the flatness of this component using a straightedge or feeler gauge . Reinstall any parts taken off the top end, correctly place new cylinder-head gasket over dowel pins in block's deck surface retaining its position while lowering it onto dowels without pushing down on this seal . Lubricate head bolt threads and hardened washers with clean engine oil, following tightening sequence on torque-to-yield bolts; reinstall lash adjusters, rocker arms, camshafts, primary timing chain and sprockets . Finally when you are through with all the above procedures refill your cooling system, change engine oil and filter before starting it up then observe for coolant or oil leaks.

Before removing the cylinder heads, relieve the fuel system pressure and disconnect the battery. Drain the cooling system.

Loosen the camshaft sprocket bolt with a wrench while holding the sprocket hex and remove the camshaft thrust plate, allowing the camshaft to slide back.

Loosen the head bolts in a specific pattern and remove them by hand.

Proceed to remove the upper and lower intake manifolds, ignition coils, spark plugs, exhaust manifold from the cylinder head, valve cover(s), rocker arms, shafts, and the timing belt along with its covers. Take note of the timing belt's direction of rotation if it is to be reused.

Raise the front of the vehicle and support it securely on jackstands.

To begin the removal process, take care not to disturb the crankshaft alignment marks and remove the primary timing chain and sprockets.

Loosen the head bolts in 1/4-turn increments in a pattern opposite of the tightening sequence until they can be removed by hand, noting that different-length head bolts should be stored in order.

Tighten bolts in the recommended sequence, install the rear timing belt cover bolts, secure the camshaft sprocket and thrust plate, and complete the remaining installation steps in reverse.

For installation, ensure the mating surfaces of the cylinder head and block are meticulously clean. Use a gasket scraper to remove carbon and old gasket material, and clean the surfaces with lacquer thinner or acetone to prevent oil presence on mating surfaces. Check the block and head surfaces for damage, use a tap to chase the threads in the head bolt holes, and examine each cylinder head bolt for stretching.

To access the cylinder heads, you should remove the intake manifold, exhaust manifold(s), valve covers, rocker arms, and pushrods.