Valvetrain, Servicing

Servicing

WARNING:
- Do not re-use any fasteners that are worn or deformed in normal use.
- Some fasteners are designed to be used only once, and are unreliable and may fail if used a second time. This includes, but is not limited to, nuts, bolts, washers, circlips and cotter pins. Replace these fasteners with new parts where indicated, and any other time it is deemed necessary by inspection.

CAUTION: After installing new hydraulic valve lifters the engine must not be started for about 30 minutes (otherwise the valves will strike the pistons). Turn the crankshaft two complete revolutions by hand before starting.

Notes:
- Cylinder heads with small cracks between the valve seats that are less than 0.3 mm (0.012 inch) wide and/or between cone valve seat and only the first four threads of the spark plug thread, can continue to be used without reduced service life.
- Carefully apply a small amount of sealant D 454 300 A2 at the four end points of the sealing surfaces on the cylinder head using a small screwdriver. Refer to Cylinder head with oil lines to camshaft bearings.

CAUTION: Part numbers are listed here for reference only. Always check with your Parts department for the latest information.