Measuring Radial Clearance Of Camshafts; Removing And Installing Camshafts - Audi A8 2003 Workshop Manual

8-cylinder TDI engine (4.2 ltr. 4-valve common rail), mechanics - Edition 12.2013
Axial clearance (exhaust camshaft):
• Specification: 0.03 ... 0.06 mm.
• Wear limit: 0.12 mm.
3.3 Measuring radial clearance of cam‐
shafts
Special tools and workshop equipment required
♦ Plastigage
Procedure
– Remove roller rocker fingers
⇒ "3.4 Removing and installing camshafts", page 167
– Clean bearings and bearing journals.
– Place a length of Plastigage corresponding to the width of the
bearing on the bearing journal or bearing shell to be measured.
• The Plastigage must be positioned in the centre of the bearing.
– Fit retaining frame and tighten to 10 Nm without rotating cam‐
shafts ⇒ page 173 .
– Remove retaining frame again.
– Compare width of Plastigage with measurement scale.
Radial clearance:
• New: 0.035 ... 0.085 mm.
• Wear limit: 0.1 mm.
3.4

Removing and installing camshafts

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Audi A8 2003 ➤
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3. Servicing valve gear