Valve Clearance, Checking

Checking valve clearance

Note! As the illustrations in the information are used for different model years and / or models, certain variations may occur. However, the essential information in the illustrations is always correct.

Preparation





Remove, (turbocharged engines)
- charge air pipe above the engine and holder at the rear of the engine.
- cover intake camshaft.
- clamp the injectors cable harness.

Remove (common)
- the upper timing cover.
- the cover over the ignition coils.

Remove (naturally aspirated engine)
- the inlet hose between the air cleaner (ACL) and throttle body (TB).
- the crankcase ventilation hose from the inlet hose. Place the inlet hose to one side.
- the camshaft position (CMP) sensor housing. Put to one side.
- the trigger wheel.





Remove (common)
- the ignition coils without removing the connectors.

Note! Mark up before removal!

- the two ground connections.
- the connector for the VVT solenoid.
- the right front wheel.
- the plastic nuts holding the cover for the fender liner.

Set the engine to the test position




Install tool 999 5754 Camshaft pos. 999 5754 Camshaft Pos. at the rear edge of the intake camshaft.
Turn the crankshaft in the direction of engine rotation (clockwise) until the marking on the tool ( In1/Ex4 )is in opposite the thin flange running straight over the top of the entire cylinder head.
Remove all plugs for the test holes.

Note! If the crankshaft is turned to far, it is essential that it is turned back at least a quarter of a turn so that it can then be turned clockwise to the correct position.

Check the valve clearance




Measure the valve clearance with feeler gauge 999 5752 Feeler gauge 999 5752 Feeler Gauge at cyl. 1 intake valves and cyl. 4 exhaust valves.
The feeler gauge is inserted through the inspection holes. Bend the feeler gauge with light finger pressure so that it is easier to follow the top of the tappet.
The correct measurement will not be obtained until the feeler gauge has gone in approximately 15 mm .






Note! This check is carried out with the engine at room temperature.

Make a note of the valve clearance on a form.

Next test measurement




Turn the crankshaft counter-clockwise until the next marking ( In2/Ex5 )corresponds with the flange on top of the cylinder head. Perform the test measurement according to the previous description.
Then continue by measuring the remaining valve clearances according to the following marking on the tool 999 5754 Camshaft pos. 999 5754 Camshaft Pos..

Finishing

Note! For tightening torques not in the text see Tightening torque, B5234T9 Tightening Torque.





Install (common)
- the plugs for the test holes. Tighten to 20 Nm (15 lb.ft) .
- the ignition coils according to the earlier marking.
- the ground connections.
- the connector for the VVT solenoid.
Remove tool 999 5754 Camshaft pos. 999 5754 Camshaft Pos..





Install (naturally aspirated engine)
- the trigger wheel. Tighten to 17 Nm (12 lb.ft) .

Note! Ensure that the trigger wheel is correctly positioned against the camshaft.

- the camshaft position (CMP) sensor housing.
- the cover over the ignition coils.
- the upper timing cover.
- the crankcase ventilation hose on the inlet hose
- the inlet hose between the air cleaner (ACL) and throttle body (TB)
- the plastic nuts from the cover in the fender liner
- the right front wheel according to Installing wheels Removal and Replacement.

Install (turbocharged engine)
- new cover intake camshaft.
- clamp the injectors cable harness.
- charge air pipe above the engine and holder at the rear of the engine.

Install (common)
- the plastic nuts from the cover in the fender liner
- the right front wheel according to Installing wheels Removal and Replacement.