Camshaft: Testing and Inspection

11 31 072 - Checking camshaft timing (S85)





Special tools required:
- 11 5 301 11 5 300 Gauge
- 11 5 302 11 5 300 Gauge
- 11 5 320 11 5 320 Plug mandrel





Important!
Do not crank engine in reverse direction.

Crank engine forward in clockwise direction only.

Risk of damage to VANOS gears.





Necessary preliminary tasks:
- Remove fan cowl with electronic fan.
- Remove left cylinder head cover [1][2]Removing and Installing/Sealing Left Cylinder Head Cover.
- Remove right cylinder head cover Removing and Installing/Sealing Right Cylinder Head Cover.
- Remove all spark plugs.





Note:
Prepare special tools.

Screw (1) acts as a spacer and is only used to check the timing.

Insert screw (1) in special tools 11 5 301 11 5 300 Gauge / E 1-5 and 11 5 302 11 5 300 Gauge / E 6-10.





Important!
In 1st cylinder firing TDC position only the inlet camshafts of cylinders 1-5 and 6-10 can be checked.

In the 39° position only the exhaust camshafts of cylinders 1-5 and 6-10 can be checked.

Crank engine at central bolt until 1st cylinder firing TDC position appears on vibration damper.

Secure vibration damper in position with special tool 11 5 320 11 5 320 Plug mandrel.





In camshaft position for cylinders 1-5, the designation E1 must be able to be read on the dihedron.

If necessary, crank engine at central bolt.





In camshaft position for cylinders 6-10, the designation E2 must be able to be read on the dihedron.

If necessary, crank engine at central bolt.





Position of camshaft in 1st cylinder firing TDC position.

The cams at the 1st cylinder on the inlet camshaft point upwards at an angle.

The cams at the 1st cylinder on the exhaust camshaft point to the exhaust side at an angle.

Designation E1 must be legible on dihedron (1).

Designation A1 is only legible from above in the 39° position.





Position of camshaft firing TDC position 1st cylinder at cylinder 6-10.

The cams at the 6th cylinder of the inlet camshaft point downwards and open the engine valves.

The cams at the 6th cylinder of the exhaust camshaft point upwards at an angle.

Designation E2 must be legible on the dihedron (1).

Designation A2 is only legible from above in the 39° position.





Attach special tool 11 5 301 11 5 300 Gauge E 1-5 with bolt (1) to inlet camshaft, 1st cylinder, at dihedron.

Note:
The timing is correctly adjusted when special tools 11 5 301 11 5 300 Gauge and 11 5 302 11 5 300 Gauge rest flat on the cylinder head or protrude by up to 1.5 mm to the inlet and exhaust sides.





Attach special tool 11 5 302 11 5 300 Gauge E 6-10 with bolt (1) to inlet camshaft, 6th cylinder, at dihedron.

Note:
The timing is correctly adjusted when special tools 11 5 301 11 5 300 Gauge and 11 5 302 11 5 300 Gauge rest flat on the cylinder head or protrude by up to 1.5 mm to the inlet and exhaust sides.





Important!
In the 39° position only the exhaust camshafts of cylinders 1-5 and 6-10 can be checked.

Remove all special tools.

Crank engine at central bolt.

Secure special tool 11 5 320 11 5 320 Plug mandrel to vibration damper (1) in the 39° position.





Attach special tool 11 5 301 11 5 300 Gauge (A 1-5) to dihedron of exhaust camshaft, 1st cylinder.

Note:
The timing is correctly adjusted when special tools 11 5 301 11 5 300 Gauge and 11 5 302 11 5 300 Gauge rest flat on the cylinder head or protrude by up to 1.5 mm to the inlet and exhaust sides.





Attach special tool 11 5 302 11 5 300 Gauge (A 6-10) to dihedron of exhaust camshaft, 6th cylinder.

Note:
The timing is correctly adjusted when special tools 11 5 301 11 5 300 Gauge and 11 5 302 11 5 300 Gauge rest flat on the cylinder head or protrude by up to 1.5 mm to the inlet and exhaust sides.





Remove all special tools.

Assemble engine in reverse sequence to its disassembly.