Checking Camshaft Timing - Engine Installed

WM 150502 Checking camshaft timing - engine installed








Preliminary work for checking camshaft timing

Preliminary work for checking camshaft timing
1. Remove rear wall cover.
2. Turn the engine clockwise at the crankshaft pulley to the TDC marking of cylinder 1. Fix with special tool locating pins 9595/1 (short locating pin).





TDC marking

3. Place jacks under the vehicle at the prescribed jacking points.
4. Remove rear underbody cover.
5. Drain engine oil.
6. Remove ground strap by unscrewing the Torx screw (M8 x 30) -arrow-.





Engine ground strap

Checking camshaft timing

Checking camshaft timing

Information
Do not turn engine crankshaft against the rolling direction of the engine.

Information
Ensure absolute cleanliness when working on the open engine. Make sure that no dirt gets into the engine.

1. Remove all four green caps on the camshaft housing covers on both cylinder banks. To do this, press a small screwdriver into the center of the piercing point of each cap -arrows- and lever off the caps.





Cap

2. Check the cylinder side that is at the overlapping TDC first (the smaller circular cutout at the milled grooves of the inlet and exhaust camshafts is facing the cylinder head cover) using an adjusting gauge 9686. Then turn the engine a further 360° (as described above) and check the other cylinder side as well.





Position of camshafts

Align camshafts.





Camshaft adjusting gauge

Subsequent work for checking camshaft timing

Subsequent work for checking camshaft timing
1. Mount two new green caps each onto camshaft-housing cover.
2. Mount ground strap, to do so fit Torx screw (M8 x 30) in place -arrow- and tighten. --> tightening torque: 23 Nm (17 ftlb.).





Engine ground strap

3. Install rear underbody cover.
4. Fill in engine oil.
5. Remove special tool locating pins 9595/1 (short locating pin).
6. Install rear panel cover.