Engine Mechanical - Mechanism & Function (H6DO): NVH Subaru Outback BR рестайлинг

VIBRATION AND NOISE, AND RIDE COMFORT PERFORMANCE

The engine mount system was reviewed, and the basic performance has been improved.

The spring constant of main mount is lowered, and, through horizontal placement of the mount, damping force is maximally utilized, thus achieving great degree of tuning freedom. With the thorough tuning, performance regarding vibration and noise and ride comfort has been improved.

Scheme 77

1. Two timing chains are used to drive the camshafts, one each for driving the two camshafts on each bank. Every camshaft is fitted with a sprocket through which it is driven by the corresponding timing chain. The left bank timing chain transmits the power from the crankshaft sprocket directly to the left bank camshaft sprockets, whereas the right bank timing chain transmits the crankshaft power via the lower idler sprocket which is driven by the left bank timing chain. (The lower idler gear has two tooth rows; the left bank timing chain engages with the inner row teeth and the right bank chain engages with the outer row teeth.) By this way, the right and left bank camshafts rotate in synchronization with each other. The left bank timing chain also drives the water pump.
2. The hydro-mechanical automatic chain tension adjuster provided for each chain constantly maintains the specified chain tension necessary to properly drive the camshafts, as well as to provide this chain and sprocket camshaft drive mechanism with a "maintenance-free" feature.