E 250 V8-5.4L (2008)
6. Repeat the previous steps for each of the roller followers being serviced.
7. CAUTION: Only use hand tools when removing or installing the spark plugs or damage can occur to the cylinder head or spark plug.
NOTE: Use compressed air to remove any foreign material from the spark plug well before removing the spark plugs.
NOTE: If an original spark plug is used, make sure it is installed in the same cylinder from which it was taken. New spark plugs can be used in
any cylinder.
NOTE: Refer to the specifications for correct spark plug identification.
Remove the spark plugs.
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To install, tighten to 18 Nm (13 lb-ft).
8. NOTE: Carry out the following steps for each cylinder requiring service.
NOTE: Position the piston of the cylinder to be serviced at the bottom of the stroke.
Use compressed air in the cylinder to hold both valves in position.
9. NOTE: If a valve drops into the cylinder, the cylinder head must be removed.
Using the special tool, compress the valve spring and remove the valve spring retainer keys.
10. Remove the valve spring retainer and the valve spring.
11. NOTE: Lubricate the camshaft roller follower with clean engine oil prior to installation.
To install, reverse the removal procedure.
