Cylinder Head Assembly: Service and Repair

1. Remove timing belt as outlined under Timing Belt.
2. Remove camshafts as outlined under Camshaft.
3. Remove exhaust manifolds as outlined under Exhaust Manifold.

Fig. 18 Cylinder Head & Valve Replacement:

4. Remove cylinder head and valves in numbered sequence as shown, Fig. 18, noting the following:
a. Using cylinder head bolt wrench tool No. MD998051-01, or equivalent, remove cylinder head bolts.
b. Using suitable valve spring compressor tool, remove valve spring retaining locks.
5. Using a suitable straightedge and feeler gauge, measure flatness of cylinder head ensuring head flatness is 0.0012 inch or less. If specification is greater, grind head no more than 0.008 inch.
6. Reverse procedure to install, Fig. 18, noting the following:
a. Install spring seat, then the valve stem oil seal using valve stem oil seal installer tool No. MD998763, or equivalent. Incorrect installation of seal without using oil seal installer tool will result in poor sealing and cause oil leakage down valve guide. Never reuse oil seals.
b. Valve springs should be installed with enamel coated side toward valve spring retainer.
c. Using suitable valve spring compression tool, install valve spring retainers.
d. Ensure correct head gasket is used on engine. Cylinder head gaskets marked with a 2DN are for non-turbocharged engines and cylinder head gaskets marked with a 2DT are for turbocharged engines.

Fig. 19 Cylinder Head Tightening Sequence:

e. Using sequence shown in Fig. 19, torque cylinder head bolts in two or three steps to 80 ft. lbs.
f. Loosen head bolts, then repeat step e.