Chevrolet 12711770 Head Assembly, Cyl (W/ Vlv)

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To perform this procedure, a new set of the MB (8 mm) and M11 (11 mm) head bolt will be required. First of all, start by removing the cable attached to the negative terminal of the battery. Take off the plenum and Intake manifold, valve covers, timing cover, timing chains, taking note of the position of the Sprocket to be meshed with crankshaft. On the left side cylinder head remove the fuel pump, The oil dipstick lube mounting bolt and tube.. Remove all electrical connectors and tap the ground straps from the cylinder heads, also remove the exhaust pipe/catalytic converter from cylinder heads. If doing the left side cylinder head removal it is advisable to also remove the power steering pump. Leverage out the upper bolt of the oil filter adapter if available then loosen all the head bolts with 1/4 turn each in the reverse sequence you used in tightening until you can do it by hand, it will be a good time to check the note of the lengths and sizes of the bolts as a guide to fit the new ones correctly. Remove the heads off the engine gently if there is resistance felt, use pry bar or long screwdriver and place the heads on wooden blocks so as not to mar the mating surfaces of the gaskets. Make sure block and cylinder heads mating surfaces are clean before assembly; use solvent to remove gasket and carbon as well as old gasket material using a gasket scraper; wipe clean with a rag soaked in lacquer thinner or acetone but be careful not to damage the aluminium covers. Ensure that there is no remnant of oil on mating surfaces since this can cause inadequate sealing and subsequently lead to formation of leaks, and clean the debris that falls on the cylinders using vacuum cleaner. Check the block and head mating surfaces for nicks and scratches, while using emery cloth for slight damage, for excessive damage you should machine. Put the new gaskets over the dowels in the block and lift the heads and put them back on the block in a manner that will not shift the gaskets. Apply a layer of a medium strength thread locking compound to the threads of the new 8mm head bolts; start those bolts without using tools and then do the same for the new 11mm head bolts. According to the described sequence, tighten the bolts in four cycles, to the given torque and the angle of turn. Whatever is left of the installation is removed in the opposite sequence to the process of instalment. Last but not the least, pour in coolant, replace the oil and the filter, switch on the engine and make sure that all is well and look for signs of coolant or oil leaks.

Position new gaskets on the dowels in the block, place the heads on the block without disturbing the gaskets.

The initial steps to remove the right cylinder head include draining the cooling system and removing the intake manifold, valve covers, pushrods, and exhaust manifold(s).

For LSA engines, remove the supercharger.

Tighten the head bolts finger tight and then follow the recommended sequence to tighten all bolts in four steps to the specified torque.

Chase the threads in the cylinder head bolt holes with a tap and clean the threads with a die.

Ensure the cylinder heads and block mating surfaces are clean and free of debris. Use a gasket scraper and brake system cleaner to clean surfaces, and check for any damage that may require machining.

The initial steps to remove the right cylinder head include draining the cooling system and removing the intake manifold, valve covers, pushrods, and exhaust manifold(s).

For the right cylinder head, remove the dipstick tube and disconnect ground cables from the front of the cylinder head.

Loosen the head bolts incrementally in reverse order of the tightening sequence until they can be removed by hand.

The cylinder head(s) can be lifted off the engine using a block of wood and a hammer.

After removing the mentioned components, the next step is to remove the alternator bracket and its mounting stud, followed by the spark plugs and spark plug wire support brackets.

After installing the cylinder heads, the final steps include changing the engine oil and filter, and checking for any leaks after starting the engine.

For removing the left cylinder head, additional steps include removing the electrical junction block bracket, power steering pump bracket, ground wire, coolant temperature sensor, and additional spark plug wire support brackets.

For the right cylinder head, remove the dipstick tube and disconnect ground cables from the front of the cylinder head.

Replace all head bolts with new ones.