P05.10-2424-11
Shown on engine 276
10 Belt pulley/vibration damper
10a Reference edge (coolant pump)
P05.10-2423-11
Engine 152.9, 157, 278, shown on engine 278
10 Belt pulley/vibration damper
10a Reference edge (poly-V belt tensioning device)
P05.10-2442-08
Shown on engine 276
2 Camshaft adjuster
Position of cylinder 1 at 40° after ignition TDC (the laser markings (arrows) are at the top)
P05.10-2443-08
Shown on engine 276
2 Camshaft adjuster
Position of cylinder 1 at 40° after overlap TDC (the laser markings (arrows) are at the bottom)
1 Rotate engine at the center bolt of the crankshaft in direction of engine rotation until marking for a 40° CKA on the belt pulley/vibration damper (10) coincides with reference edge (10a).
The reference edge (10a) is located for engine 276 on the coolant pump and for engines 152.9, 157, 278 on the poly-V belt tensioning device.
The engine must not be turned against the direction of rotation of engine otherwise the timing chain can get jammed.
2 Check position of camshafts based on the laser marks (arrows).
If the laser marks on the camshaft adjusters (2) are located at the top (see picture 3) and the mark 40° is at the reference edge (10a), then cylinder 1 is at 40° after ignition TDC.
If the laser marks on the camshaft adjusters (2) are located at the bottom (see picture 4) and the mark 40° is at the reference edge (10a), then cylinder 1 is at 40° after overlap TDC.
A complete crankshaft revolution (360°) lies between 40° after ignition TDC and 40° after overlap TDC on cylinder 1.