Camshaft, Measuring Radial Clearance

WARNING: This page is about a different car, the 2015 Audi S7, 2015 Audi RS 7, 2014 Audi S7, 2014 Audi RS 7, and 2013 Audi S7. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Plastigage®

Procedure

NOTE:

Use old bolts to measure radial play.

-- Remove the camshafts, refer to CAMSHAFT, REMOVING AND INSTALLING .

-- Mark the assignment of the roller rocker lever for installation later.

-- Remove the roller rocker lever and place it on a clean surface.

-- Clean the bearing and the bearing journals.

-- Place Plastigage® over entire width of bearing journal or into bearing.

Plastigage® must rest in center of bearing.

-- Re-install the camshafts, mount the camshaft housing and tighten with an additional turn, refer to Figure, do not turn the camshafts while doing this.

-- Remove the camshaft housing and the camshafts again.

-- Compare width of Plastigage® with calibrated scale.

Radial clearance:

For 24 mm diameter bearings: 0.024 to 0.066 mm.
For 36 mm diameter bearings: 0.032 to 0.078 mm.

-- Replace bolts for the final assembly.