Clean the sealing surfaces of the cylinder head and the exhaust manifold with a gasket scraper or a wire brush.
Take caution to keep all debris out of the cylinder head.
Dry with compressed air.
Inspect the cylinder head bosses and turbocharger mounting studs for damage. Repair or replace as necessary.
NOTE: If the exhaust manifold is damaged, check for charge-air leaks. A charge-air leak can cause progressive
damage to the exhaust manifold. Refer to Procedure 010-024 in Section 10.
Use a precision straightedge, Part Number 4918219, or equivalent, to check the manifold mounting surfaces for
flatness. Lay the straightedge on edge across all ports and measure the flatness with a feeler gauge.
If any port measures out of specification, replace the exhaust manifold.
NOTE: For multi-piece manifolds, each section must be verified to be flat independantly. If either section is found
to be out of specification, replace both sections of the manifold.
The assembled two-piece manifold is not required to meet the flatness specification of the one piece manifold , as
some misalignment is allowed in the design of the manifold, and will be eliminated naturally when the manifold capscrews are torqued to specification during installation.
