Toyota 11101-79156 Head Sub-Assy, Cylinder

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Clean and inspect the cylinder head and valve train components to identify necessary valve service work during engine overhaul. Remove old gasket material from the head gasket, intake and exhaust manifold sealing surfaces. Clean scale from coolant passages and remove deposits from various holes with a wire brush. Clean the cylinder head, lifters, valve springs, spring seats, keepers, and retainers with solvent. Remove deposits from the valves with a motorized wire brush. Inspect the head for cracks, coolant leakage, and damage. Check the head gasket surface for warpage and the valve seats in the combustion chambers. Check valve stem-to-guide clearance and deflection. Inspect each valve face for wear, deformation, cracks, pits, and burned areas. Measure each valve's margin width. Check valve springs for wear and measure their free length. Inspect spring retainers and keepers for wear and cracks. Replace any damaged or excessively worn parts. If valve components are worn beyond limits, reassemble the valves in the cylinder head.

First, disconnect the negative battery cable and drain the cooling system. Remove the air intake plenum, intake manifold, exhaust manifold(s), alternator, and power steering pump. Remove the timing belt, camshaft sprockets, and upper idler pulley. Remove the bolts securing the number 3 timing belt cover and disconnect the coolant sensor connectors. Remove the camshaft(s), disconnecting electrical connectors from VVT sensors and the timing oil control valve. Remove the rear cylinder head bolts and move engine wiring harnesses away from the heads. Remove the recessed head bolts, then loosen and remove the remaining bolts. Lift the cylinder head off the engine block. Repeat for the other head. For installation, clean mating surfaces on the cylinder heads and block. Clean the cylinder head bolt holes and threads. Position new gaskets over dowel pins in the block, placing the head on the block without disturbing the gasket. Apply engine oil to the threads of the head bolts and install them in their original locations, tightening finger-tight before following the recommended sequence to tighten the bolts. Tighten each 12-point bolt an additional 1/4-turn and then tighten the recessed bolt. Repeat for the other cylinder head. Complete the remaining installation steps in reverse order, including refilling the cooling system, changing the oil and filter, running the engine, and checking for leaks.

After installing the cylinder heads, you should refill the cooling system, change the oil and filter, run the engine, and check for any leaks.

Slowly release the compressor and ensure the keepers seat properly.

After installing the cylinder head, you should reinstall the components that were removed, check and adjust the valves as necessary, change the engine oil and filter, refill the cooling system, run the engine, and check for leaks.

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

To remove the cylinder head, you need to carefully loosen the cylinder head bolts in 1/4-turn increments until they can be removed by hand. It's crucial to loosen them in this specific manner to prevent warping or cracking of the cylinder head. The cylinder head can be lifted off the engine block, and if it's stuck, it should be cautiously pried up at the transaxle end, beyond the gasket surface.

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