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The heading materials were prepared by Denis BOROVITSKY, Alexey VOROBYEV-OBUKHOV

OUR DIESEL APPROACH

The Yaroslavl Fuel Equipment Plant (YAZTA) is developing equipment for powering diesel engines meeting Euro II and Euro III standards.

Skeptics say: between the domestic and Western auto industry, the abyss is the depth of the Mariana Trench. However, this does not prevent Minsk trucks from surfing the vast expanses of Europe where UNECE Euro II standards apply, and KamAZ trucks from winning the prestigious Dakar 2000 race. But did you know that the YaMZ engines of these cars are equipped with Compact-40 high-pressure fuel pumps, which allowed in 1997 to certify eight promising YaMZ diesel engines for compliance with UNECE Euro II standards?

Pumps inherited from their ancestors a block (European school) design. Pumping sections with three shut-off holes, the cunning geometry of the cut-off edges of the spiral groove, and the increased diameter, stroke and speed of the plunger were housed in a single housing. The hydraulic characteristics of the plunger pair were significantly improved, the injection pressure increased to the required 1250 atm.

But the pump control, strangely enough, remained the same - a mechanical regulator, although it has undergone changes. By Western standards, antiquity, but for Russian carriers that are not spoiled by competent service, is what is needed. Simplicity of design, cheap parts, excellent maintainability, Euro II.

Today, the plant produces two basic fuel injection pumps-175.1111 005 and 135.1111 005, which open YaMZ-7511 motors; 7601 second euro breath.

In order to reach Euro III, the block design of the pump had to be abandoned, giving preference to individual pumps capable of developing 1600 atm. By the way, YaAZ-204, 206 engines created on the basis of the American General Motors two-stroke diesel engine were equipped with similar pump nozzles. These "column" pumps, mounted, like their Russified ancestors, in the immediate vicinity of the cylinder, are connected to the nozzle by a short tube, virtually no effect on the system. The modified nozzle received an improved atomizer with a light needle with a diameter of 4.5 mm.

The fuel supply control is entrusted to the electronic system, clearly, unlike its short-sighted mechanical counterpart, which monitors all changes in the operation of the engine and promptly corrects the injection parameters. By the way, one of the first electronic regulators of the joint development of YaZTA and NPO Avtoelektronika (Moscow) in the early 90s was tested on a MAZ car with a YaMZ-238 engine. However, despite the positive result, the project was canceled - they saved money. The Russian consumer remained faithful to traditional mechanics. Well, it will be necessary to resume research, especially since the adaptation of new pumps to YaMZ-650 and 530 diesels is being completed.

How quickly the factory workers will find the funds and bring the prototypes to marketability, time will tell. Today, in order to load the main production, the plant develops related products. For example, hydraulic chain tensioners (belts) and hydraulic compensators for Zavolzhsky (ZMZ-406.10; 514.10) and Tolyatti (VAZ 2121 4; 2123; 1119; 2112) power units, as well as repair of fuel pumps of foreign cars, are made on the equipment of the precision workshop. Not far off is the installation and commissioning of the spark plug production line of the French company Sagem.

Fuel pump "Compact-40".

Hydro bearings (left) and chain tensioner (belt) for VAZ and Zavolzhsky motors.

Section and nozzle of pumps Euro II.