Lincoln AT4Z-6049-C Cylinder Head Assembly

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The engine must be completely cool when the heads are removed. Failure to allow the engine to cool off could result in head warpage.

Caution 1: These engines are difficult to work on and require special tools for many procedures. For any procedure involving timing chains, camshafts, or cylinder head removal, the steps must be read carefully, and disassembly must proceed using the special tools; otherwise, damage to the engine could result. Caution 2: The engine must be completely cool when the cylinder heads are removed. Failure to allow the engine to cool off could result in cylinder head warpage. Caution 3: The manufacturer states that the cylinder head cannot be machined in the event of warping. If the cylinder head warpage exceeds 0.001 inch (0.0254 mm), it must be replaced.

Disconnect the hoses from the coolant outlet housing.

Use spray-on gasket remover and a hard plastic or wood scraper to remove all traces of gasket and carbon.

The cylinder head bolts are the torque-to-yield type and are stretched during tightening. Therefore, the original bolts must be discarded and new bolts installed during assembly.

Tighten the bolts, in sequence, to the torque and angle of rotation listed in Specifications. Use a torque wrench, then a breaker bar and a special torque angle adapter to tighten the bolts the required angle.

Check the valve clearances before disassembly, so any required new lifters can be ordered from a dealership.

Do not use a scraper of any kind or abrasive discs to remove old gasket material, as the block, heads, and intake manifold(s) are aluminum.