Jeep 68280502AB Head-Engine Cylinder

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The first step is to relieve the fuel system pressure and disconnect the cable from the negative terminal of the battery, ensuring to disconnect the Intelligent Battery Sensor connector first on 2015 and later models.

Install the camshaft thrust plate at the back of the head using a new O-ring, tighten the bolts to the specified torque, and complete the remaining installation steps in reverse order of removal.

Position the new gasket over the dowel pins, carefully place the cylinder head on the engine block, and install new cylinder head bolts, tightening them in the recommended sequence without applying additional oil to the threads.

Using a breaker bar and the appropriate sized socket, loosen the cylinder head bolts in 1/4-turn increments until they can be removed by hand, following the reverse order of the lightening sequence to avoid warping or cracking the head.

Complete the remaining installation steps, which include changing the engine oil and filter, and refilling the cooling system. Finally, start the engine and check for leaks and proper operation.

To complete the installation, components removed from the head, such as lash adjusters, exhaust manifold, and camshaft, should be reinstalled.

After loosening the cylinder head bolts, you can lift the cylinder head off the block.

Take off the valve covers, rocker arms, and pushrods.

All additional components attached to the cylinder head, such as coolant fittings, ground straps, cables, hoses, wires, or brackets, should be labeled and removed.

Threads in the head bolt holes should be chased with a tap and cleaned with compressed air.

Depending on the cylinder head, you may need to remove other components like the alternator, transmission and oil dipstick tube, air conditioning compressor, or heater core tube. Additionally, the timing chain cover should be removed, and the crankshaft should be rotated to Top Dead Center (TDC).

For installation, position the new head gasket over the dowels in the block, place the cylinder head over it without disturbing the gasket, and apply engine oil to the head bolt threads and underneath the bolt heads. Install the bolts in their original locations and tighten them following the recommended sequence to the specified torque.

Disconnect the exhaust pipe from the turbocharger, remove the viscous fan and drive assembly, and raise the engine with support or a hoist. Remove the right engine mount through-bolt and the engine mount itself. Disconnect the turbo oil drain fitting and seal the openings. Disconnect the air intake temperature sensor wiring, remove the air filter housing and snorkel, and tape the open turbo port. Disconnect heater hoses, oil supply line, and coolant lines from the turbocharger, sealing the openings. Remove the EGR cooler, exhaust manifold with the turbo attached, fan and shroud assembly, and the drive belt. Lower the alternator, disconnect the upper radiator hose, and label and disconnect all wiring attached to the cylinder head. Remove the engine oil dipstick tube bolt, air intake housing, pump-to-fuel rail line, fuel rail-to-head lines, and fuel line shield. Remove the fuel injectors and rocker housing.

To install the heads, ensure the mating surfaces are clean and free from old gasket material and dirt. Use a gasket scraper and brake cleaner to clean the surfaces. Check for any damage and remove it if necessary. Chase the threads in the head bolt holes and clean the bolt threads.

Clean the block and head mating surfaces thoroughly, checking for nicks and scratches. Check for warpage using a straightedge and feeler gauge. Clean the injector nozzle seats and the block deck surface, ensuring it's within specified limits. Chase the threads in the head bolt holes with a tap and die, and measure the head bolt lengths. If the bolts are stretched beyond the allowable length, replace them.

Lift the heads off the engine using a block of wood or by striking a wood block with a hammer. Store the heads on blocks of wood.