Repair of 1.4 and 1.6 liter engines on a car

This part of the Chapter describes the types of engine repair work performed directly on the car. If the engine was removed from the car and disassembled, then some preliminary disassembly operations can be omitted.

The 1.4 and 1.6 liter engines belong to the GA series installed on Nissan vehicles. Engines 16-valve overhead valves, four cylinders in a row and two camshafts. The engine is located across the axis of the car, in front of it. The transmission is installed on the left side of the engine.

Crankshaft 5-support. The axial play of the crankshaft is regulated by the selection of thrust half rings mounted on the upper half of the middle main bearing.

Connecting rod bearings consist of two shells inserted into the connecting rod and into the connecting rod cap. The connecting rods are connected to the pistons by means of fingers that move freely in the connecting rod head and are secured with spring retaining rings. The pistons are cast from aluminum alloy, there are three rings on the pistons - two compression and one oil scraper.

The intake and exhaust valves are closed by coil springs and move inside guide bushings pressed into the cylinder head along with the valve seats. With increased wear, the seats and bushings can be pressed out and replaced with new ones.

The camshafts are chain driven and actuate 16 valves via bucket-type tappets. The tappets are installed under the camshafts. Valve clearances are adjusted by selecting special washers for thickness. The lower bearings of the camshaft journals are beds bored in the tides of the cylinder head.

The engine is lubricated by an oil pump driven by the crankshaft toe. The oil passes through an oil receiver with a coarse filter, then through a fine filter screwed into the engine block, and is fed into the lubrication channels inside the cylinder block and crankcase, 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. Camshaft cams, valve stems and other engine parts are splash lubricated.