Engine Overhaul Manual v8 4.0 4.6
ENGINE
14
OVERHAUL
Cylinder head - refit
1. Clean cylinder block and cylinder head faces
using suitable gasket removal spray and a
plastic scraper.
2. Ensure that bolt holes in cylinder block are
clean and dry.
CAUTION: Do not use metal scraper or
machined surfaces may be damaged.
3. Fit cylinder head gasket with the word ’TOP’
uppermost.
NOTE: Gasket must be fitted dry.
4. Carefully fit cylinder head and locate on
dowels.
5. Lightly oil threads of new cylinder head bolts.
NOTE: RH cylinder head illustrated.
6. Fit new cylinder head bolts:
Long bolts: 1, 3 and 5
Short bolts: 2, 4, 6, 7, 8, 9 and 10
7. Using sequence shown, tighten cylinder head
bolts to:
Stage 1 - 20 Nm (15 lbf.ft)
Stage 2 - 90 degrees
Stage 3 - Further 90 degrees
CAUTION: Do not tighten bolts 180
°
in one
operation.
Engines fitted with secondary air injection (SAI)
8. Fit new secondary air injection adapters and
using a suitable hexagonal drive bit, tighten to
33 Nm (24 lbf.ft).
CAUTION: Do not use air tools to tighten
adapters.
All engines
9. Fit rocker shaft assembly.
10. Repeat above procedures for remaining
cylinder head.
