UAZ vehicles are equipped with a four-cylinder, four-stroke, overhead valve, liquid-cooled carburetor engine

Depending on the year of manufacture and configuration, engines of models 414, 4178, 4218 manufactured by JSC Volzhsky Motors (Ulyanovsk) and model 4021.60 manufactured by JSC Zavolzhsky Motor Plant (Zavolzhye, Nizhny Novgorod Region) can be installed.</p >

Model 4021.60 engines are designed for installation on UAZ vehicles.

UAZ engine left view

Fig. 1. Engine (left view): 1 – fuel fine filter; 2 - oil filler cap; 3 - oil level indicator; 4 - rocker cover; 5 – a head of the block of cylinders; 6 - sensor-distributor; 7 - starter; 8 – clutch housing; 9 - the lower part of the clutch housing; 10 - fuel pump; 11 – engine mount bracket

Engine - carbureted, four-cylinder, in-line, four-stroke, with two valves per cylinder. Cylinder firing order: 1-2-4-3.

The cylinder block is cast from an aluminum alloy. Cylinder liners cast iron cast into the block.

An aluminum clutch housing is bolted to the rear end of the block.

Pistons are cast from aluminum alloy. Each of them has two compression and one oil scraper rings.

Compression rings - cast iron, top - chrome-plated, bottom - tin-plated.

Piston pins are of a floating type, they are held from axial movement by retaining spring rings.

Steel, forged, I-section connecting rods with a split lower head, the cover of which is fastened with two bolts and nuts.

A bronze bushing is pressed into the upper (piston head) of the connecting rod.

The crankshaft is cast iron, cast, full support, with counterweights, dynamically balanced assembled with a flywheel and installed in the cylinder block on five split main plain bearings.

Main and connecting rod bearings are made in the form of liners made of steel tape coated with anti-friction aluminum-tin alloy.

The shaft is kept from axial displacement by two thrust rings, which are installed on both sides of the front main bearing.

The ends of the crankshaft are sealed with rubber cuffs. A hub is pressed on the front toe of the crankshaft, to which a damper pulley is bolted.

UAZ engine right side view

Fig. 2. Engine (right view): 1 - drain cock of the cylinder block; 2 - block of cylinders; 3 - exhaust manifold; 4 - damper for heating the intake pipe; 5 - inlet pipeline; 6 - carburetor; 7 - generator; 8 - oil pressure indicator sensor; 9 - sensor signal lamp emergency oil pressure; 10 - oil filter; 11 - oil sump drain plug

The cylinder head is cast from aluminum alloy. Cast iron seats and ceramic-metal valve bushings are pressed into it.

The head is attached to the block with ten studs and nuts through a metal-asbestos gasket.

On the right side, the exhaust manifold and intake manifold are attached to the head.

The cast iron camshaft is installed in the bored holes of the lower part of the cylinder block.

At its front end, on the key, a textolite or polyamide helical drive gear is installed.

UAZ car engine

The camshaft cams, when it rotates, act on cylindrical pushers that are installed in the holes of the block.

Aluminum push rods with steel spherical tips actuate valve rockers mounted on a common fixed steel axle.

On the short arm of the rocker there is a screw with a lock nut for adjusting the clearance in the valve actuator.

Thin-walled bronze bushings are pressed into the rocker holes.

The valves are made of heat-resistant steel.

Each valve is equipped with two right-handed and left-handed springs and is installed in a ceramic-metal guide bush made of sintered copper-iron-graphite powder with molybdenum disulfide.

The valve stems are sealed with rubber baffle caps that prevent oil from entering the combustion chambers.

The top of the block head is closed with a stamped steel cover.

Combined lubrication system - under pressure and spray.

Under pressure, the main and connecting rod bearings of the crankshaft, camshaft bearings, rocker bushings, upper tips of the push rods are lubricated.

Camshaft and auxiliary drive gears The power units are lubricated with a jet of oil, and the rest of the parts are sprayed.

The cylinder walls are additionally lubricated by a jet of oil, which is ejected from the hole in the lower head of the connecting rod.

The gear oil pump is driven together with the ignition distributor sensor by a screw gear from the camshaft.

The pump body is aluminum, and its working spur gears are made of sintered metal.

Oil is drawn by a pump from a stamped steel sump through a mesh oil intake, then it passes the pump, a full-flow filter and is fed into the oil line.

The oil pressure in the system is limited by the pressure reducing valve.