Camshaft: Testing and Inspection

11 31 072 - Checking camshaft timing (S65)





Special tools required:
- 11 0 480 11 0 480 Plug Mandrel
- 11 5 320
- 11 9 970 11 9 970 Set of Gauges
- 11 9 971 11 9 970 Set of Gauges
- 11 9 972 11 9 970 Set of Gauges






Important!
Bank (2), cylinders (5 - 8), is checked first.

The timing of bank (1) at cylinders (1-4) can only be checked at overlap TDC.

The lettering (E1 and A1) must point downwards.





Necessary preliminary tasks:
- Remove fan cowl Service and Repair with electronic fan.
- Remove left cylinder head cover. Service and Repair
- Remove right cylinder head cover. Service and Repair
- Remove all spark plugs Service and Repair.





Important!
Danger of mixing up both special tool bores.

10 ° - 10° before TDC (top dead centre)
OT - Top dead centre






Important!
Only bank 2, cylinders (5 - 8), can be checked in cylinder no. 1 firing TDC position.

The 10° position is required only to adjust the timing.

Crank engine at central bolt until the firing TDC position appears on the vibration damper.

Engine installed: Secure vibration damper in position with special tool 11 0 480 11 0 480 Plug Mandrel.

Engine removed: Secure vibration damper in position with special tool 11 5 320.





Important!
Bank 2 is checked first.

The lettering (A2 and E2) points upwards.

The positions of the cams on the exhaust camshaft point vertically upwards (see picture).

The positions of the cams on the inlet camshaft point at an angle downwards (see picture).





Position special tool 11 9 972 11 9 970 Set of Gauges on twin surface of exhaust camshaft (A2).

Position special tool 11 9 971 on twin surface of inlet camshaft (E2).

The timings are correctly set when special tool 11 9 970 11 9 970 Set of Gauges rests without a gap on the cylinder head.

Permissible tolerance: A maximum gap of 1.0 mm is permitted on the non-contacting side of special tool 11 9 970 11 9 970 Set of Gauges.





Important!
Remove special tools 11 9 970 11 9 970 Set of Gauges and 11 5 320.

Crank engine at central bolt 360° in direction of rotation.

The timing of bank 1 at cylinders (1-4) can only be checked at overlap TDC.

Crank engine at central bolt until the firing TDC position appears on the vibration damper.

Engine installed: Secure vibration damper in position with special tool 11 0 480 11 0 480 Plug Mandrel.

Engine removed: Secure vibration damper in position with special tool 11 5 320.





Important!
Position of camshaft at overlap TDC

The lettering (E1 and A1) points downwards.

The cams on cylinder no. 1 on the inlet camshaft point at an angle downwards (see picture).

The cams on cylinder no. 1 on the exhaust camshaft point at an angle downwards (see picture).

Position special tool 11 9 971 11 9 970 Set of Gauges on twin surface of inlet camshaft (E1).

Position special tool 11 9 972 11 9 970 Set of Gauges on twin surface of exhaust camshaft (A1).





The timings are correctly set when special tool 11 9 970 11 9 970 Set of Gauges rests without a gap on the cylinder head.

Permissible tolerance: A maximum gap of 1.0 mm is permitted on the non-contacting side of special tool 11 9 970 11 9 970 Set of Gauges.

Adjust valve timing.





Remove all special tools.

Assemble engine in reverse sequence to its disassembly.