Mopar 4777541 Head-Cylinder

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Cylinder heads are new and rebuilt and are often available for order for almost every make and model of engine at dealerships and auto parts stores. Since only specialized tools are required for the removal and inspection of the cylinder head together with potential replacement heads may not be easily acquired, it may very well be more convenient and cost effective for the home mechanic to acquire a new head and bolt it on than to remove, inspect and re-condition the one that came with his engine. The process of dismantling cylinder head entails the following, that is the removal of intake valves, exhaust valves and other related parts. If they are still in place, dismantle all the rocker arm shafts and camshaft of SOHC engine, and the bearing caps, camshafts, rocker arms and lash adjusters of the DOHC engine. Some parts can be labeled and put back to where they will be needed while there are those that should be placed separately and then be replaced again in the intended area. Before depowdering the valves, make a tag and place together with the rest part of the respective valve so that they are not mixed up when reinstalled on the valve guides. Take off the keepers on the first valve and, with a spring compressor, compress the springs and take off the retainer and the spring. Pull the valve out of the head pulling its stem up thus removing the valve stem seal, further, pull the spring seat out of the guide. Sealing of valve stems and spring mounting are combined on four-cylinderic engines. If it freezes in the guide, it is removed back to the head and the surface around the keeper groove and the step tip should be cleaned with a fine file or whetstone. Perform the same for the other valves, assembly all components of the valve together to reassemble. Once the valves and components are out and placed properly the head of the valve has to be cleaned and examined. If you are having your engine rebuilt completely, go for total engine disassembly before going for cleaning and scrutinity of the cylinder head.

Mark the bolts in relation to the cylinder head and place another mark 90-degrees clockwise from the starting mark.

Ensure that all components are returned to their original locations without mixing them up.

Place the cylinder head(s) in position on the engine block, install the washers onto the cylinder head bolts, apply clean engine oil to the cylinder head bolt threads, and install them into the cylinder head.

Inspect the head for cracks, coolant leakage, and other damage, consulting an automotive machine shop if necessary.

Ensure it meets specifications; any valve with a margin narrower than specified must be replaced.

Cover the litter valley with shop rags to keep debris out of the engine and remove any debris that falls into the cylinders.

Remove the rocker arm components and hydraulic lash adjusters, then detach the exhaust manifold(s), ensuring that each manifold may remain attached to the cylinder head until after the head is removed from the engine.

Begin by installing the spring seats or valve rotators, if equipped, before the valve seals.

All traces of old gasket material and sealant should be carefully scraped off the head gasket, intake manifold, and exhaust manifold mating surfaces to avoid gouging the cylinder head. Special gasket removal solvents can be used for easier removal.

After removing and organizing the valves and components, thoroughly clean and inspect the head, completing any engine disassembly before starting the cleaning and inspection process.

Stuff the cylinders with clean shop rags and use a vacuum cleaner to remove any material that falls into the cylinders.