Timing Belt: Description and Operation

A single timing belt drives four camshafts (intake and exhaust camshafts on each bank). The back of the belt also drives the water pump.
The timing belt teeth have a specially designed round profile to provide quiet operation. The timing belt is composed of a strong and inflexible core wire, a wear resistant canvas and heat-resistant rubber material.
A hydraulic automatic belt-tensioner adjuster constantly maintains specified belt tension to properly drive the camshafts, as well as to provide a "maintenance-free" advantage.
The camshaft sprocket is made of resin. Compared with the alloy type one, it is lighter in weight.

NOTE:
- *: #1 piston is set at Top Dead Center (TDC) when piston-position mark on crankshaft sprocket is aligned with mark on cylinder block.
- **: #1 piston is set at TDC on compression stroke when piston-position mark on camshaft sprocket is facing directly upward.