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Engine - 6.8L- E350 & E450: Overhaul Ford Econoline E350 Super Duty

Mechanical 10 illustrations ~369 words

Disassembly

CAUTIONCylinder head machining or milling is not authorized by the Ford Motor Company. Cylinder head flatness must be within 0.0254 mm (0.001 in) across a 38.1 mm (1.5 in) square area.
CAUTIONPlace the cylinder head on a cardboard or wood surface to prevent damage to the joint face.

Scheme 513

Scheme 513
Scheme 513

Scheme 514

Scheme 514
Scheme 514

Scheme 515

Scheme 515
Scheme 515

Scheme 516

Scheme 516
Scheme 516
  1. Remove the hydraulic lash adjusters.
  2. Install the special tool between the valve spring coils to prevent valve stem seal damage.
  3. Using the special tool, compress the valve springs.
  4. Remove the valves. Remove the valve spring retainer keys. Remove the valve spring retainers. Remove the valve springs. Remove the valves.
  5. Remove the valve stem seals.
  6. Remove the bolts, the bearing caps and the camshaft.
  7. Clean and inspect the camshaft bearing caps. One of the bearing caps contains an oil flow restriction groove. Make sure the groove is free of foreign material.

Scheme 517

Scheme 517: Assembly
Scheme 517: Assembly

Scheme 518

Scheme 518
Scheme 518

Scheme 519

Scheme 519
Scheme 519

Scheme 520

Scheme 520
Scheme 520

Scheme 521

Scheme 521
Scheme 521

Scheme 522

Scheme 522
Scheme 522
  1. Check the cylinder head for distortion. For additional information, refer to «ENGINE SYSTEM-GENERAL INFORMATION»(ref-231364).
  2. Clean the cylinder head sealing surfaces. Remove any large deposits of silicone or gasket material with a plastic scraper. Apply silicone gasket remover, following package directions, and allow to set for several minutes. Remove the silicone gasket remover with a plastic scraper. A second application of silicone gasket remover may be required if residual traces of silicone or gasket material remain. Apply metal surface prep, following package directions, to remove any remaining traces of oil or coolant, and to prepare the surfaces to bond with the new gasket. Do not attempt to make the metal shiny. Some staining of the metal surfaces is normal.
  3. Lubricate the camshaft journals with clean engine oil.
  4. Install the camshaft and the camshaft bearing caps in their original locations. Lubricate the camshaft bearing caps with clean engine oil. Position the camshaft bearing caps. Install the bolts loosely.
  5. Tighten the bolts in the sequence see scheme 423
  6. Install the valves in the valve guides located in the cylinder head.
  7. Use the special tools to install the valve stem seals.
  8. Install the valve springs and the valve spring retainers onto the valves.
  9. Install the special tool between the valve spring coils to prevent valve stem seal damage.
  10. Use the special tool to compress the valve springs. Install the valve spring retainer keys.
  11. Install the hydraulic lash adjusters in their original locations.
  12. Remove the special tool, unless the cylinder head is to be installed in-vehicle.

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