An update in 2006 saw a drainage hole drilled in the block to allow any pooled water to escape we don't know if this definitively fixed the problem, but we've found XC90s made after 2006 do seem to have fewer balance shaft failures. Without grease, the bearings fail and the balance shaft starts eating in to the engine block, potentially taking out the timing chain as well when it finally seizes. This compact, narrow-angle 60° V8 was shorter than the T6 and thus was able to be paired with better transmissions like the Aisin-Warner TF-80 SC 6-speed automatic, but after a few years some problems with the balance shaft in the vee of the V8 began to surface: the shaft bearings aren't lubricated by engine oil and sometimes wear out, particularly in early motors where any water that gets in the engine bay can't drain and instead collects in the vee and gradually washes the grease out of the bearings. Like the same powertrains in the S80, the five-speed Aisin transmission was dependable enough, but the T6's 280lb-ft of torque and rapid boost onset from the parallel turbos was uncomfortably close to the GM-derived transmission's maximum torque rating, and hard shifts and loss of certain gears can be an expensive portent of overheating issues, failed valve bodies/solenoids, and brake band and clutch pack failures.Īppearing in 2005 and gradually replacing the troublesome T6 was a new V8 engine, designed by Volvo and built by Yamaha in Japan. In the USA, the XC90 at launch was powered by " white block" inline five and inline six engines, either the " 2.5T" light pressure inline five turbo, or the " T6" inline six twin-turbo, backed by 5-speed Aisin-Warner AW50/55 and 4-speed GM 4T65 automatic transmissions respectively. When the sensors pick up a speed difference between the front and rear wheels, the Haldex controller in the rear of the car locks up a clutch, the " Active On-Demand Coupling (AOC)," transferring power across to the rear wheelsen the front wheels lose traction. On AWD XC90s, the Haldex system uses the car's existing ABS wheel speed sensors to not only detect wheel lock-up under heavy braking, but also wheel slip under heavy acceleration. The XC90 is no Land Rover, but the new AWD system developed by fellow Swedish company Haldex Traction made the car-based XC90 surprisingly capable on loose surfaces, especially when paired with DSTC stability control to keep slides and spins at bay. Shaped more like an SUV than the lower, wagon-derived XC70, Volvo intended it to go toe-to-toe with other car-based SUVs like the BMW X5, but with a greater focus on practicality with features like seating for 7, rear passenger audio and climate controls, and seats that could be folded and stowed with one hand (including the rear third row that could be entirely stowed under the cargo floor). The result of their design efforts launched in 2003 as the XC90, slotting in above the XC70 in Volvo's lineup. With Volvo's new S80 flagship luxury sedan and S60 and V70 midsize cars debuting the advanced P2 platform, Volvo began to ponder the success of new market segments, including one they'd helped pioneer with the XC70: the "soft roader", tall wagons and crossovers featuring a high seating position and two-box shape like a traditional SUV, but in a unibody chassis with car-like fuel economy and driving manners.
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