Buick Enclave 2008 and GMC 3.6L V6 VVT Car Engine PDF Manual

Introduced in the 2008 Saturn Outlook, Buick Enclave and GMC with the 3.6L V6 VVT (RPO LY7) was the first in GM Powertrain’s global family of high-feature V6 engines, with four cam, four valves per cylinder configuration, with the cams driven by maintenance free silent primary chain drive. Its architecture was jointly developed by GM technical centers in Australia, Germany, the United States and Sweden. The 3.6L VVT
DI V6 is based on the philosophy that a true family of global engines provides the best value and performance for the customer and the best return on investment for General Motors.

It applies the most advanced automotive engine technology available, from state-of-the-art casting processes to full four-cam phasing to ultra-fast data processing and torque-based engine management. Since its launch, application has spread to an expanding number of vehicles for one primary reason. The 3.6L V6 VVT delivers a market-leading balance of good specific output, high torque over a broad rpm band, fuel economy, low emissions and first-rate noise, vibration and harshness control, with exclusive durability enhancing features and very low maintenance.

Like earlier versions of the high-feature V6, the 3.6-liter VVT DI employs four cam phasing to change the timing of valve operation as operating conditions such as rpm and engine load vary. The result is linear delivery of torque, with near-peak levels over a broad rpm range, and high specific output (maximum horsepower per liter of displacement) without sacrificing overall engine response and drivability. When combined, direct-injection and cam phasing technologies enable an unmatched combination of power, efficiency and low-emissions in gasoline V6 engines.

By closing the exhaust valves late at appropriate times, the cam phasers allow the engine to draw the desired amount of exhaust gas back into the combustion chamber, reducing unburned hydrocarbon emissions. The return of exhaust gases also decreases peak temperatures which contributes to the reduction of oxides of nitrogen (NOx) emissions. In tandem with the dramatic 25-percent reduction in cold-start hydrocarbon
emissions brought on by direct-injection, the 3.6-liter VVT DI V6 surpasses all emissions mandates, and does so without complex, weight-increasing emissions control systems such as EGR and air injection reaction (AIR).

The 3.6L V6 VVT DI has a new timing chain with a smaller pitch (7.7 mm compared to 9.5mm previously) and more links. The chain features an inverted tooth design. The smaller links engage at a lower impact speed, which decreases the noise generated. In conjunction with the new chain, the number of teeth on the sprockets is also increased, increasing the meshing frequency and further reducing noise and vibration. The new timing chain is a running change that will occur in all of GM Powertain’s V6 VVT engines through the course of the 2007 model year.

The oil pan on 3.6L V6 VVT DI is stiffened to improve powertrain rigidity and reduce vehicle vibration. The oil pan bolts to the transmission bell housing as well as the engine block, eliminating points of vibration. The oil pan provides another example of extensive efforts to minimize noise and vibration in the 3.6L V6 VVT. Cast aluminum dampens internal engine noise better than a conventional stamped steel pan. Structurally, it is
considerably stiffer. The design was optimized with math-based analysis and carefully crafted curves in the pan’s sides and bottom. These reduce the broadcasting or “drumming’’ of noise created as oil flows through the crankcase, and they increase bending stiffness in the pan.

Download Buick Enclave 2008 and GMC 3.6L V6 VVT Car Engine PDF Manual