Details of the valve timing adjustment mechanism (Discovery 3)

Item name	Spare part number	Description
A	-	Front of the engine
1	-	Drive of the left camshaft assy
2	-	Drive of the right camshaft assy
3	-	Spacer
4	-	Intermediate shaft sprocket
5	-	Chain guide
6	-	Intermediate shaft chain tensioner
7	-	tensioner pin
8	-	Countershaft chain

Camshaft drive assembly

Each camshaft drive includes the following parts:

• Countershaft gear
• Camshaft gear
• Drive chain
• Chain guide

The left drive assembly is driven from the front of the layshaft, and the right drive assembly is driven from the rear.