Engine Overhaul Manual v8 4.0 4.6
ENGINE
4
OVERHAUL
5. Clean gasket surface in rocker cover and on
cylinder head, ensure bolt holes are clean and
dry.
6. Fit new gasket, dry to rocker cover.
CAUTION: Replace cork gasket(s) with
modified gasket(s) which incorporate
compression limiters in the bolt holes.
7. Fit rocker cover to cylinder head, fit new
’patched’ multi-hex bolts and tighten in
diagonal sequence to:
Stage 1 - 3 Nm (2.5 lbf.ft)
Stage 2 - 8 Nm (6 lbf.ft)
CAUTION: The 2 short bolts must be fitted
on side of cover nearest centre of engine.
Ensure that outer rim of gasket is correctly
positioned around periphery of rocker cover.
8. LH rocker shaft only: Align dipstick tube to
rocker cover, fit and tighten screw.
CYLINDER HEAD
Cylinder head - remove
1. Remove rocker shaft assembly.
2. Mark heads LH and RH for reassembly.
Engines fitted with secondary air injection (SAI)
3. Using a suitable hexagonal drive bit, remove
and discard 2 secondary air injection adapters
from cylinder head.
NOTE: To release the adapter thread
locking agent and prevent damage to the
cylinder head, remove the adapters by
loosening then tightening slightly. Repeat this
procedure until the adapters are removed.
CAUTION: Do not use an air tool to
remove adapters.