Valve Timing: Description

WARNING: This page is about a different car, the 2006 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Timing Drive System Diagram

Courtesy of DAIMLERCHRYSLER CORP.

1 - RIGHT CAMSHAFT SPROCKET AND SECONDARY CHAIN	6 - PRIMARY CHAIN
2 - SECONDARY TIMING CHAIN TENSIONER (LEFT AND RIGHT SIDE NOT INTERCHANGEABLE)	7 - IDLER SPROCKET
3 - SECONDARY TENSIONER ARM	8 - CRANKSHAFT SPROCKET
4 - LEFT CAMSHAFT SPROCKET AND SECONDARY CHAIN	9 - PRIMARY CHAIN TENSIONER
5 - CHAIN GUIDE (LEFT AND RIGHT SIDE ARE NOT INTERCHANGEABLE)

The timing drive system has been designed to provide quiet performance and reliability to support a non-free wheeling engine. Specifically the intake valves are non-free wheeling and can be easily damaged with forceful engine rotation if camshaft-to-crankshaft timing is incorrect. The timing drive system consists of a primary chain, two secondary timing chain drives and a counterbalance shaft drive.