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The petrol engine of 2.0 liters

This part describes the kinds of works on repair of engines with 2.0-liter, performed directly on the vehicle. If the engine was removed from the vehicle and disassembled, all the preliminary operations on dismantling are excluded.

It should be noted that despite the real possibility of major repairs without removing the engine such as the nodes connecting rod and piston group, this type of work usually can not be performed as a kind of independent operation. To repair the crank and other mechanisms usually must perform some additional activities (optional, for example, is to clean parts and flushing oil channels). For this reason, these works are included in the list of main engine overhaul procedures.

Description of the engine

The engine of 2.0 liters (1998 cm / cc) refers to a series of SR, installed on cars Nissan.

Engine 16-valve, overhead-valve, four-cylinder engine arranged in a row and two camshafts. Motor vehicle is located transverse to the axis, in the front part thereof. Transmission for the left side of the engine.

Crankshaft bearing 5. The axial clearance of the crankshaft is governed by the selection of persistent half rings, mounted near the top of the liner middle (third) main bearing.

Connecting rod bearings consist of two inserts inserted into the connecting rod and the connecting rod cap parallel to the axis of the crankshaft. The connecting rods connected to the pistons by means of fingers which are mounted with an interference fit into the head of the connecting rod and secured in the piston-spring retainer rings. Piston cast in aluminum alloy pistons provided on three of the ring - two compression and one oil scraper.

The cylinder block is cast iron, inside the cylinders are bored. On engines of this type cylinder bores are sometimes called "dry liners."

Inlet and outlet valves are closed under the action of the coil springs and move within guide bushings pressed into the cylinder head with the valve seats. With increased wear the seat and the hub can drive out independently from each other and replaced.

The camshafts are driven by chains and control the 16 valves through levers. Levers mounted directly under the cam. Valve clearances are adjusted automatically by means of hydraulic devices. Lower support necks of camshafts are bed bored tides in the cylinder head.

For engine lubrication oil pump is driven by the crankshaft of the sock. The oil passes through the oil receiver with pre-filter and through a fine filter, screwed into the engine block, from which the lubrication channels inside the cylinder and crankcase is sent to the main bearings of the crankshaft and the camshaft bearing necks. Connecting rod bearings are lubricated under pressure through a hole in the crankshaft, pressurized and lubricated and basic necks of a cam. Cams camshaft, valve stems and other parts of the engine are lubricated by spraying. On some models, the oil cooler is provided, intended to maintain the oil temperature at a constant level under extreme conditions of engine operation.