Camshaft Timing Components - Secondary Drive
WARNING: This page is about a different variant/trim than selected.
NOTE:
Bank 1 cylinder head installation shown, Bank 2 is similar.
| ITEM | DESCRIPTION |
|---|---|
| 1 | Tensioner firing pin |
| 2 | Secondary timing chain |
| 3 | Bolt (2 of) |
| 4 | Intake camshaft |
| 5 | Exhaust camshaft |
| 6 | Timing chain tensioner |
Secondary drive is provided by two short secondary timing chains, which transfer drive from the exhaust camshaft sprockets to the intake camshaft sprockets. The secondary drives are located at the rear of the Bank 1 cylinder head and the front of the Bank 2 cylinder head. This allows for a much shorter and simpler run for the timing belt at the front of the engine.
Each secondary timing chain is tensioned via an automatic chain tensioner, which acts directly on the chains via a guide rail. The tensioners are located between the exhaust and intake camshafts at the front or rear of the cylinder head, depending on the cylinder bank.
The tensioner firing pin holds the automatic chain tensioner in a compressed state to aid installation.