Camshaft: Testing and Inspection

11 31 005 - Checking camshaft timing (M52TU / M54 / M56)





Special tools required:
- 00 9 250 00 9 250 Torque Wrench with Flexible Extension
- 11 2 300 11 2 300 Plug Mandrel
- 11 3 240 11 3 240 Locking Fixture
- 11 3 450 11 3 450 Compressed Air Connection
- 11 4 220 11 4 220 Chain Tensioner





Necessary preliminary tasks:
- Remove fan impeller with fan clutch
- E60: Remove fan cowl with electric fan
- Remove cylinder head cover Service and Repair
- Remove all spark plugs Replacing All Spark Plugs





Detach cover for inlet camshaft.





Important!
Cylinder for chain tensioning piston is under spring pressure.

Remove cylinder for chain tensioning piston.





Install special tool 11 4 220 11 4 220 Chain Tensioner.
Fit adjusting screw to bow cover.





Preload tensioning rail with special tool 11 4 220 11 4 220 Chain Tensioner by rotating adjusting screw with special tool 00 9 250 00 9 250 Torque Wrench with Flexible Extension or standard torque wrench to 0.7 Nm.





Unscrew oil pressure pipe.





Mount special tool 11 3 450 11 3 450 Compressed Air Connection with banjo bolt of oil pressure line.





Important!
Cover double VANOS adjustment unit; when the compressed air supply is connected, several drops of oil are sprayed out of the bore.





Connect compressed air (2 to 8 bar).





Note:
When the engine is switched off, it is possible that the camshafts are not in their initial positions. With the compressed air supply connected, rotate the engine to return the camshafts to their initial positions.

With compressed air supply connected, crank engine at least two revolutions in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face each other.





Pull dust guard out of the special tool bore.





Secure crankshaft with special tool 11 2 300 11 2 300 Plug Mandrel in TDC firing position of 1st cylinder.

Important!
Do not turn the engine back.
Remove special tool 11 2 300 11 2 300 Plug Mandrel before starting engine.





Automatic transmissions only:
Illustration does not show automatic transmission.

Important!
On engines with automatic transmissions, there is shortly before the special tool bore (1) a large bore (2) which can be confused with the special tool bore (1)

If special tool 11 2 300 11 2 300 Plug Mandrel is secured in the correct bore (1), the engine can no longer be cranked at the central bolt.





Unscrew studs.





Place special tool 11 3 240 11 3 240 Locking Fixture on camshafts.





Note:
The timing is correctly set if the special tool 11 3 240 11 3 240 Locking Fixture rests without a gap on the cylinder head or protrudes up to 1 mm to the inlet side.
The timing must be reset if the special tool 11 3 240 11 3 240 Locking Fixture protrudes to the exhaust side.
If necessary, adjust camshaft timing Adjustments.





Detach compressed air connection.
Remove special tool 11 3 450 11 3 450 Compressed Air Connection.





Fit oil pressure line with new seals.
Tightening torque 11 36 2AZ 11 36 Variable Camshaft Control VANOS.





Remove special tool 11 3 240 11 3 240 Locking Fixture.





Remove special tool 11 2 300 11 2 300 Plug Mandrel.
Install dust guard from inspection bore.





Unfasten and remove special tool 11 4 220 11 4 220 Chain Tensioner.





Install cylinder for chain tensioning piston Service and Repair.
Assemble engine.