| 1. Depression measurement is reliable and rather cheap way of diagnostics of the engine. Under indications вакууметра it is possible to receive representation about a condition of piston group, tightness of linings of a head of the block of the cylinders which are soaking up and final collectors, correctness of adjustment of the engine, etc. |
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2. Вакууметр joins to задроссельному to space to measure pressure directly on a soaking up collector. It is not necessary to connect вакууметр to hoses of auxiliary units. |
| 3. Vacuum diagnostics is expedient for uniting with other methods of diagnostics. |
| 4. Initial factors on which indications вакууметра are analyzed and the most exact conclusions about an engine condition become, the absolute instrument reading and character of movement of an arrow of the device (dynamics of indications) are. |
| 5. Before the beginning of tests completely warm up the engine, block wheels. |
| 6. Check up the indication вакууметра. On the serviceable engine idling, вакууметр should show depression 430–560 мм.рт.ст., and the arrow of the device should be almost motionless. |
| 7. If indications вакууметра on 75–200 мм.рт.ст. Below normal also are unstable (the arrow twitches) it specifies in a leak in a lining on an input of a soaking up collector, or on infringement of tightness of an atomizer. |
| 8. If the arrow regularly deviates on 50–100 мм.рт.ст., the reason is негерметичность valves. Check up a compression in engine cylinders. |
| 9. If the arrow irregularly deviates towards low indications, or shaking shows low depression the reason is the raised resistance to movement of valves, or ignition faults. Check up a compression in cylinders and examine candles. |
| 10. If idling the arrow quickly fluctuates within 100 мм.рт.ст., and engine work is accompanied by a smoke from the muffler directing plugs of valves are worn out. If the arrow quickly fluctuates with simultaneous increase in turns of the engine it is necessary to check up tightness of a lining of a soaking up collector, elasticity of springs of valves. Such indications also can be caused a burn-out of valves and ignition faults. |
| 11. Weak fluctuations of an arrow within 20–30 мм.рт.ст. Specify in unstable work of ignition. |
| 12. At the big fluctuations of an arrow check up a compression in cylinders. |
| 13. Slow change of depression in a wide range specifies in a contamination of system of ventilation of a boat, abnormal structure of a mix, and also on leak in a collector lining. |
| 14. Finish turns of the engine to 2500 rpm and release a pedal. Indications вакууметра should fall almost to zero, then increase and exceed the control indications corresponding to stationary idling, approximately on 125 мм.рт.ст., then depression should be restored at former level. The different behaviour of depression specifies in deterioration of piston rings. If these indications vary too slowly check up cleanliness of channels of an exhaust system (especially neutralizer). |
