Remove parts at the engine's trailing edge

WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Charge Air Pipe Sealed With Paper Wipe

Courtesy of VOLVO CARS OF NORTH AMERICA.

Remove

air filter housing with hoses.
camshaft sensor with trigger wheel.
torque arm with bracket.
the spark plugs.
NOTE:
Make sure that no impurities can fall down in the combustion compartment.