In order to change the hydraulic valve lifters on a 603.193 engine (W124 300
D turbo) the camshaft must be removed. The procedure would be pretty
straightforward but there is a confusing discrepancy in the repair manual.
The repair manual says:
It is absolutely essential to observe the following sequence during removal
and installation in order to avoid damage to the camshaft:
Unscrew both hexagon bolts on camshaft bearing caps 1, 5 and 6 (DARK
arrows). Loosen both hexagon bolts on camshaft bearing caps 2, 3, 4 and 7 in
increments of one turn respectively, until counter pressure is reduced
OK. but the supporting picture shows exactly the opposite - the arrows over
bearing caps 1,5 and 6 are LIGHT and the arrows over caps 2, 3, 4 and 7 are
What is true - the numbers or the arrow color?
Or in other words, which bearing caps must be unscrewed first and which must
be loosen after that?