5.6.1. Design features

Fig. 3.29. Details of a fuel supply system: I \the CD20 engine without fuel heater; II \the CD20 engine with a fuel heater; III \CD20E engine; 1 — the water level sensor in a settler of the fuel filter; 2 — laying; 3 — the fuel filter; 4 — an arm of fastening of the filter of the manual toplivopodkachivayushchy pump; 5 — the bringing fuel-supply line; 6 — a drain fuel-supply line; 7 — the fuel level sensor; 8 — the fuel tank; 9 — a bulk pipe; 10 — a cover of the fuel tank; 11 — the fuel discharge regulator

Enter a power supply system the fuel pump of high pressure (FPHP) of distributive type which is put in action by a gear belt from the camshaft, a nozzle, the fuel filter and fuel-supply lines, details of an air path of the engine. Details of system are represented in fig. 3.29, 3.30, 3.31.

Fig. 3.30. Details of system of injection of fuel: I \CD20 engine; II \CD20E engine; 1 — the cogged pulley of the TNVD drive; 2 — a TNVD case cover; 3 — an arm; 4 — a spline; 5 — TNVD; 6 — a drain hose; 7 — fuel-supply lines of high pressure; 8 — the drain pipeline; 9 — a cap; 10 — a fastening nut; 11 — laying; 12 — the top part of the case of a nozzle; 13 — an adjusting washer; 14 — a spring; 15 — a pusher; 16 — a pro-rate; 17 — a nozzle spray sock; 18 — the lower part of the case of a nozzle; 19 — a thermoprotective washer; 20 — an arm for raising of the engine; 21 — a nozzle with the sensor of raising of a needle (the 1st cylinder)

Fig. 3.31. Details of an air path of the engine: 1 — the inlet pipeline; 2 — laying; 3 — the HORN system pipeline; 4 — the HORN system valve; 5 — an adapter; 6 — the air distributor; 7 — an air duct; 8 — a branch pipe of the air filter; 9 — a cover of the case of the air filter; 10 — the filtering element; 11 — the case of the air filter; 12 — an air inlet; 13 and 14 — resonators

The fuel tank with a capacity of 60 l is stamped from a steel sheet and fixed under a body before a back axis. In the fuel tank the fuel level sensor is installed. Access to the sensor is provided via the hatch in a body floor under a back seat. Indications of the index of level of fuel can be ottarirovana according to these tab. 3.11.

Indications of the index of level of fuel in a combination of devices	Distance between the center of a float and the privalochny surface of the sensor, mm	Values of resistance between conclusions "In and "3", Ohm
Arrow at the beginning of a scale	131	78-85
Arrow in the middle of a scale	36	27-35
Arrow at the end of a scale	36	4-6

Fig. 3.32. Fuel discharge regulator: I \temperature of fuel is above 30 °C; II \temperature of fuel is below 30 °C; 1 — the fuel tank; 2 — the fuel discharge regulator; 3 — the fuel filter; 4 — TNVD; 5 — a nozzle; 6 — a branch pipe to the fuel tank; 7 — a branch pipe from TNVD; 8 — the drain valve; 9 — the filtering element; 10 — a float; 11 — the backpressure valve

In system the regulator of discharge of fuel (fig. 3.32) which is installed between TNVD and the fuel tank is used. Fuel, passing through the filter, TNVD and nozzles is warmed in process of warming up of the engine. The regulator of discharge of fuel at a temperature of fuel below 30 °C a part sends it to the fuel filter for heating. At a temperature over 30 °C of plums of fuel occurs in the fuel tank.

The fuel filter of the Nissan 16403-59EOO brand with the replaceable filtering element fastens to a cover on the left side of a front board in a motor compartment. Frequency of service of the filter: discharge of a sediment — through 10 000 km of a run (when replacing oil in the engine); replacement of the filtering element — each 30 000 km of a run.

The air filter with the replaceable dry paper filtering Nissan V0100 element is located in the case on the left side about the rechargeable battery in a motor compartment. Frequency of replacement of the filtering element — through each 60 000 km of a run.

The sensor of the index of existence of a sediment is installed in the filter of rough purification of fuel. It gives a signal on a control lamp in a combination of devices about need to merge a sediment.

The fuel pump of high pressure is located behind on the left side of the engine and is put in action by a gear belt from the cogged pulley of the camshaft from a flywheel. On CD20 engines TNVD with the rotating distributor, the centrifugal mechanical regulator of frequency of rotation, the electromagnetic valve of adjustment of an advancing of injection of fuel operated by the electronic control unit (ECU), the device for launch of the cold engine and the electromagnetic valve of a stop is established. On CD20E engines single-plunger TNVD of distributive type with the electric drive of the proofreader of supply of fuel, electromagnetic the valve of adjustment of a corner of an advancing of injection of fuel and the valve of a stop operated by EBU is established. Characteristics of TNVD are provided in tab. 3.12. TNVD does not demand adjustment, except for adjustment of a corner of an advancing of injection of fuel. Characteristics of nozzles are given in tab. 3.13. On CD20E engines the TNVD driving belt transfers also rotation to the vacuum pump. The direction of rotation is determined by shooters on a belt which have to be directed towards the engine. The tension of a belt is regulated by a tension roller with the clown and a spring. Frequency of replacement of a belt: through 90 000 km of a run.

Nozzles (four) are rolled in a head of the block of cylinders. The adjusting washers used for installation of pressure of the beginning of injection are issued from 0,50 to 1,0 mm thick with an interval through each 0,04 mm.

Parameter	CD20 engine	CD20E engine
Brand and type	ZEXEL NP-VE 4/10 F2500 LNP123S	ZEXEL NP-VE 4/10 E2500 LNP13
Catalog number	16700-7501	16700-2610
The pump plunger course corresponding to an initial corner of an advancing of injection of fuel when finding the piston of the 1st cylinder in VMT of a step of compression, mm	0,79-0,35	0,38+0,03
Initial corner of an advancing of injection of fuel to VMT (idling), a hail	8	0+1
Frequency of rotation of a bent shaft idling, mines-1	700+50	725+25
Frequency of rotation of a bent shaft on accelerated single to the course, min.-1	1300
The maximum frequency of rotation of a bent shaft (without loading),	5400	5400

Parameter	CD20 engine	CD20E engine
Brand and type of nozzles	NPDNOSD1510	NPDNOSND220
Pressure of the beginning of injection, kPa:
new nozzles	12,75-13,53	13,24-14,02
the earned extra nozzles	12,26-13,24	12,26-13,24

The electromagnetic valve of a stop fastens at TNVD end face, blocks intake of fuel to the distributor. Resistance of the valve is 18 Ohms.