General information (Opel Insignia A)

Cylinder block

The cylinder block, cast from aluminum alloy, has four cylinders arranged in a row. The cylinders have pressed-in steel liners. In the lower part of the block there are five main bearings for installing the crankshaft, and on the second main bearing (from the front of the engine) the installation of thrust half rings is provided, regulating the axial play of the crankshaft. The design of the crankshaft main bearing plate-bed is used in the cylinder block, therefore the engine crankcase is formed by the upper and lower parts. This design ensures greater rigidity of the cylinder block and reduces noise and vibration.

Crankshaft

The crankshaft main journals have transverse lubrication holes, and the upper main bearing shells have grooves. The balance shaft drive sprocket is movably mounted on the crankshaft. The bearing of the second main support is equipped with thrust half rings. Torsional vibrations are damped by a damper pulley.

Connecting rods and pistons

The connecting rods use floating piston pins. The pistons are made of aluminum alloy. The piston rings have a low expansion force to reduce friction. The upper compression ring is made of high-strength cast iron with a molybdenum coating and phosphated sidewalls. The second compression ring is made of gray cast iron. The oil scraper ring of the spring design has a chrome coating and consists of three parts.



Information taken from the website opelbook

Oil pan

The oil pan is made of aluminum alloy. The oil pan includes gearbox mounting elements, which provides additional structural strength.

Balance shafts assembly

The engine is equipped with two balance shafts located on either side of the crankcase at the bottom of the cylinder bores. The balance shafts are driven by a single-row roller chain, which also drives the water pump. The drive chain is tensioned by a hydraulic tensioner fed directly from the oil pump. This design ensures maximum efficiency of the balance shaft system and reduces noise and vibration.

Cylinder head

The cylinder head is made by casting aluminum into a semi-permanent mold. The valve guides and seats are made of metal ceramics and pressed into the cylinder head. The fuel injectors are located under the intake ports. In addition, the cylinder head design includes the main bearings and camshaft bearing caps.

Valves

Each cylinder has two intake and two exhaust valves. Each intake valve uses a crank mechanism located at the bottom of the valve spring to reduce inertial mass. All valves are equipped with oil-deflecting caps.

Camshafts

The engine uses two camshafts: one for the intake valves, the other for the exhaust valves. The camshafts are made of high-strength cast iron.

Valve lifters

Roller rockers and hydraulic compensators are used to lift the valves. Roller rockers reduce friction and noise.

Cylinder head cover

The cylinder head cover has a steel throttle for the crankcase ventilation system, as well as places for installing ignition system components.

Timing drive

A single-row roller chain is used to drive the timing mechanism. A tensioner and damper are used to control the chain movement and reduce noise. The timing chain drive ensures a long service life and is virtually maintenance-free.