Engine Overhaul Manual v8 4.0 4.6
INFORMATION
DATA, TORQUE & TOOLS
1
DATA
Firing order
1, 8, 4, 3, 6, 5, 7, 2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cylinders 1, 3, 5, 7 - LH side of engine
Cylinders 2, 4, 6, 8 - RH side of engine
Cylinder heads
Maximum warp
0.05 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.002 in
Reface limit
0.50 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.02 in
Valve springs
Free length
48.30 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.90 in
Fitted length
40.40 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.60 in
Load - valve open
736
±
10 N
. . . . . . . . . . . . . . . . . . . . . . . . . . .
165
±
2 lbf
Load - valve closed
339
±
10 N
. . . . . . . . . . . . . . . . . . . . . . . . . .
76
±
2 lbf
Valves
Valve stem diameter:
Inlet - All engines
8.660 to 8.680 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.340 to 0.342 in
Exhaust:
Standard and carbon break valves - Early
engines
8.651 to 8.666 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.340 to 0.341 in
Modified carbon break valves - Later engines
8.641 to 8.656 mm
. . . . .
0.336 to 0.340 in
Valve head diameter:
Inlet
39.75 to 40.00 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.56 to 1.57 in
Exhaust
34.226 to 34.480 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.34 to 1.35 in
Valve installed height:
Standard and carbon break valves - Inlet and
exhaust - Early engines - maximum
47.63 mm
. . . . . . . . . . . .
1.9 in
Modified valves - Inlet and exhaust - Later
engines - maximum
44.16 to 45.29
. . . . . . . . . . . . . . . . . . . . . . . . .
1.741 to 1.802 in
Valve stem to guide clearance:
Inlet - All engines
0.025 to 0.066 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . .
0.001 to 0.002 in
Exhaust
Standard and carbon break valves - Early
engines
0.038 to 0.078 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.0015 to 0.003 in
Mofified carbon break valves - Later engines
0.048 to 0.088 mm
. . . . .
0.0019 to 0.0035 in
Valve guides
Valve guide installed height
15.0 mm
. . . . . . . . . . . . . . . . . . . .
0.590 in
Inside diameter after reaming
8.7 mm
. . . . . . . . . . . . . . . . . .
0.34 in
Valve seats
Valve seat angle:
Inlet and exhaust - Up to 99 MY
46
°
to 46
°
25’
. . . . . . . . . . . . . . .
Inlet and exhaust - From 99 MY
45
°
to 45
°
30’
. . . . . . . . . . . . . . .
Valve seat diameter:
Inlet
36.83 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.45 in
Exhaust
31.50 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.24 in
Valve seating width:
Inlet
0.89 to 1.4 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.035 to 0.055 in
Exhaust
1.32 to 1.83 mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0.052 to 0.072 in
Valve seating face angle
45
°
. . . . . . . . . . . . . . . . . . . . . .
