Hydraulic Adjusting Elements, Checking

WARNING: This page is about a different car, the 2015 Audi Q7, 2014 Audi Q7, and 2013 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

The hydraulic adjusting elements cannot be repaired.

Irregular valve noises are normal while starting the engine.

Special tools and workshop equipment required

Crankshaft Turning ToolT40257
Wrench - 21mmT40263
AdapterT40314
Plastic wedge
Feeler Gauge

Procedure

-- Start the engine and let it run until the coolant fan switches on once.

-- Increase engine speed for about 2 minutes to approximately 2500 RPM, perform a road test if necessary.

-- If the hydraulic adjusting elements are still loud, determine which one is faulty as follows:

-- Remove the cylinder head cover. Refer to LEFT CYLINDER HEAD COVER, REMOVING AND INSTALLING ; RIGHT CYLINDER HEAD COVER, REMOVING AND INSTALLING .

-- Join the tools as illustrated.

Fig 1: Crankshaft Turning Tool, Wrench - 21 MM And Adapter

Courtesy of AUDI OF AMERICA, LLC

Socket 21 mm for ¹ /₂ "-drive

Fig 2: Identifying Wrench - 21 MM T40263

Courtesy of AUDI OF AMERICA, LLC

CAUTION:

Components could be destroyed by the camshaft timing chains jumping off.

Turn crankshaft only in direction of engine rotation -arrow-.

-- To determine the play between cam lobes and roller rocker lever, press the lever down with a plastic wedge in direction of -arrow-.

Fig 3: Identifying Play Between Cams With Screwdriver -Arrow- And 0.20 mm Feeler Gauge

Courtesy of AUDI OF AMERICA, LLC

-- If a 0.20 mm feeler gauge can slide between the cam lobes and roller rocker lever, replace the adjusting element. Refer to CAMSHAFTS, REMOVING, USED CAMSHAFTS FOR CYLINDER BANK 1 (RIGHT), REINSTALLING .

Final Procedures

-- Install the cylinder head cover. Refer to LEFT CYLINDER HEAD COVER, REMOVING AND INSTALLING ; RIGHT CYLINDER HEAD COVER, REMOVING AND INSTALLING .