Contents: Position of the throttle valves of…↓ Starting device ↓ Accelerator pump performance ↓ Needle valve tightness ↓
Adjusting the position of the carburetor throttle valves
a – partial opening of the primary chamber throttle valve; b – full opening of the throttle valves; 1 – lever on the secondary chamber throttle valve axis; 2 – lever limiting the opening of the secondary chamber throttle valve; 3 – lever rigidly connected to the primary chamber throttle valve axis; 4 – damper control lever; 5 – primary chamber throttle valve; 6 – secondary chamber throttle valve
Adjusting the starting device drive
1 – air damper drive lever; 2 – air damper; 3 – starting device rod; 4 – starting device rod; 5 – adjusting screw; 6 – primary chamber throttle valve; 7 – throttle actuator rod
Position of the throttle valves of the carburetor 2105-1107010-20
1. Check that the throttle valves are fully open by turning their drive levers to the stop position.
2. Adjust the maximum opening of the primary chamber throttle valve (13±0.5 mm) by bending the lower antennae (see fig. Adjusting the position of the carburetor throttle valves) lever 3.
3. Adjust the maximum opening of the secondary chamber throttle valve (15±0.5 mm) by tightening or loosening the pneumatic actuator rod.
4. Partial opening of the primary chamber throttle valve, at which the upper antenna of lever 3 contacts lever 2, should be 6±0.1 mm. This size is adjusted by bending the upper antenna of lever 3.
Starting device
5. When turning lever 1 (see fig. Adjusting the starting device drive) counterclockwise until it stops, the air damper should be completely closed. Moreover, in this position of the lever, the end of the rod 3 should be at the end of the groove of the rod 4 of the starting device, but at the same time not move the rod. This requirement is met by bending the rod 3.
6. With the air damper fully closed, the primary chamber throttle valve should be slightly open by 0.70–0.80 mm (gap C is the distance between the valve and the chamber wall at the transition holes of the idle system). This gap is adjusted by bending the rod 7.
7. A fully closed air damper should open 50,5 mm (gap B) by rod 4 of the starting device when it is manually moved to the right until it stops. This value is adjusted by screw 5.
Accelerator pump performance
8. The performance of the accelerator pump is checked for 10 (ten) full strokes of lever 4 (see fig. Adjusting the position of the carburetor throttle valves) throttle control. The fuel that comes out of the pump sprayer during these ten strokes is collected in a measuring cup. Its volume should be 5.25–8.75 cm³.
9. Before starting the test, make ten test strokes with lever 4 to fill the channels of the accelerator pump.
Needle valve tightness
10. The tightness of the needle valve is checked on a stand that supplies fuel to the carburetor under a pressure of 30 kPa (3 m water column). After setting the level in the test tube of the stand, its fall is not allowed for 10-15 seconds. If the fuel level in the tube decreases, this indicates a fuel leak through the needle valve.