Vanden Plas L6-4.0L (1990)
Fig. 15 Cylinder Head Bolt Spacer Locations
- Remove the cylinder head bolt from No 2 cap, LH camshaft (1).
- Remove the cap securing bolts from No 2 cap, LH camshaft.
- Remove No 2 cap from the LH camshaft.
- Fit spacer tool 18G 1435 (2) to the head. Fit and torque tighten the cylinder head bolt.
- Repeat the procedure for Nos 3, 4, 5 and 6 caps, LH camshaft (3).
- Remove the cylinder head bolt from No 7 cap, LH camshaft.
- Remove alternately the securing bolts from Nos 1 and 7 caps, until the LH camshaft is free.
- Lift the camshaft from the cylinder head, and fit spacer tool 18G 1435 to No 7 cylinder head bolt position (5). Fit and torque tighten the bolt.
- Repeat the procedure for the RH camshaft.
- Remove all the shims, or only those requiring adjustment, check the size of the existing shims with a micrometer and note the reading. Calculate the
size of the shim required following the examples.
VALVE CLEARANCES
Inlet and Exhaust ......................................................................................................................................................................................... 0.012-0.014in
EXCESSIVE CLEARANCE - EXAMPLE
Size of existing shim
0.100
Plus the actual clearance noted
0.019
= 0.119
Less the specified valve clearance
0.013
Equals required shim size
0.106
INSUFFICIENT CLEARANCE - EXAMPLE
Size of existing shim
0.107
Plus the actual clearance noted
0.010
= 0.117
Less the specified valve clearance
0.013
Equals required shim size
0.104
Letter
Thickness
A
0.085 in
B
0.086 in
C
0.087 in
D
0.088 in
F
0.089 in
G
0.089 in
H
0.090 in
I
0.091 in
J
0.094 in
K
0.095 in
L
0.096 in
M
0.097 in
N
0.098 in
0
0.099 in
P
0.100 in
0
0.101 in
R
0.102 in
S
0.103 in
T
0.104 in
U
0.105 in
V
0.106 in
W
0.107 in
X
0.108 in
Refit
- Fit the relevant shims to the cylinder head.
- Fit the LH camshaft at approximately TDC.
- Lubricate Nos 1 and 7 caps.
- Fit No 1 cap. Fit but do not tighten the cap securing bolts.
- Remove No 7 cap cylinder head bolt.
