Vanden Plas L6-4.0L (1990)
12.
Check that the pointer on the front timing cover is in line with the arrowed (TDC) tooth edge on the timing ring, Illustration 2. Realign the pointer
if necessary.
13.
The crankshaft positions for resetting the camshafts are one and a half teeth on either side of the arrowed (TDC) tooth edge on the timing ring as
shown in Illustration 2.
14.
Rotate the crankshaft two revolutions in a clockwise direction (viewed from the front of the engine) until the pointer is one and a half teeth before
the arrowed (TDC) tooth edge on the timing ring, position A, Illustration 2.
NOTE:
Do not release the timing chain tension during this operation since the accuracy of the valve timing depends on maximum chain tension.
15.
Remove the retaining bolts and the camshaft sprocket vernier coupling, Illustration 3, from the exhaust camshaft, but do not detach the sprocket
from the camshaft flange. The camshaft is free to rotate inside the sprocket with the coupling removed.
16.
Position the camshaft setting tool 18G-1433/A across the camshafts with the positioning tab on the exhaust camshaft, Illustration 1.
17.
Turn the exhaust camshaft until the tab on the setting tool engages the slot in the camshaft.
18.
With the camshaft in this position, reinstall the sprocket vernier coupling to the exhaust camshaft. This step will require several attempts to find the
exact alignment of the vernier splines and the bolt holes.
19.
Install the locking tabs and the coupling bolts. Lightly tighten the bolts.
20.
Remove the setting tool and turn the crankshaft in a clockwise direction (viewed from the front of the engine) until the pointer is one and a half
teeth after the arrowed (TDC) tooth edge on the timing ring, position B, Illustration 2.
NOTE:
Do not release the timing chain tension during this operation since the accuracy of the valve timing depends on maximum chain tension.
