The 1.4 and 1.6 liter engines belong to the GA series, installed in Nissan cars. The engines are 16-valve with overhead valves, four cylinders arranged in a row and two camshafts. The engine is located transversely to the axis of the car, in its front part. The transmission is installed on the left side of the engine.
The crankshaft has 5 bearings. The axial clearance of the crankshaft is adjusted by selecting thrust half rings installed on the upper half of the middle main bearing.
Connecting rod bearings consist of two liners inserted into the connecting rod and into the connecting rod cap. The connecting rods are connected to the pistons using pins that move freely in the connecting rod head and are secured with spring retaining rings. The pistons are cast from an aluminum alloy; there are three rings on the pistons - two compression rings and one oil scraper ring.
The intake and exhaust valves are closed by coil springs and move inside guide bushings pressed into the cylinder head together with the valve seats. If the valve seats and bushings are worn out, they can be pressed out and replaced with new ones.
The camshafts are chain-driven and control 16 valves via bucket-type tappets. The tappets are mounted under the camshafts. Valve clearances are adjusted by selecting special washers by thickness. The lower bearings of the camshaft journals are beds bored into the cylinder head bosses.
The engine is lubricated by an oil pump driven by the nose of the crankshaft. The oil passes through an oil receiver with a coarse filter, then through a fine filter screwed into the engine cylinder block, and is fed into lubrication channels inside the cylinder block and crankshaft housing, from which it is directed to the crankshaft main bearings and to the camshaft bearing journals. The connecting rod bearings are lubricated under pressure through holes inside the crankshaft. The camshaft cams, valve stems and other engine parts are lubricated by splashing.
The publication is reprinted from this resource: nissanbook.ru