Domestic motorcycle engine D6 is a two-stroke engine with one cylinder. The unit has a carburetor feed system, installed on different models of mopeds. Due to the simplicity of design and versatility, the power plant is often used on light agricultural machinery or various kinds of motor home-made products. Consider the parameters, features, as well as the repair of this unit.
D6 engine: technical specifications
The following are the parameters of the technical plan of the unit under consideration:
- Type - in-line.
- Injection - carburetor.
- The cylinder block material is aluminum.
- The number of cylinders is one.
- Power indicator - 1 horsepower at 4500 rpm.
- Piston movement - 40 mm.
- Type of carburetor - K34B.
- Compression - 6.
- The fuel used is a mixture of gasoline and oil.
- Weight - 6.5 kg.
- Fuel consumption - 1.8 l / 100 km.
Modifications
The D6 engine is available in two varieties: D6 and D6U. The design of these motors is identical, but the rotation chains differ. The power unit has atmospheric cooling, which made it possible to significantly simplify its design. The original placement of the combustion chamber made it possible to solve the problem of excessive heat loading without the need to install an additional ribbed cylinder to increase cooling efficiency.
The regular carburetors and the power unit are reliable and economical, which reduced the cost of operating the motor. The carburetor itself does not require special maintenance, especially if you observe the proportions when preparing the fuel mixture and carry out timely preventive maintenance.
Features
The D6 engine, the circuit of which is given below, due to the simplicity of design, can easily be adapted to the equipment frame by means of fixing clamps. Torque to the rear wheels is made by clutches and a suitable roller chain. A gearbox is not provided for in such a design; the motor is controlled by a throttle handle mechanically connected to a carburetor.
The D6 engine, despite the small displacement and compact dimensions, provides lightweight two-wheeled vehicles with good dynamic characteristics. On a flat area, the moped can accelerate to 40 km / h. Thanks to the stock of traction, the machine can be operated without problems on rural roads. Despite the fact that more than 50 years have passed since the creation of the motor, it is still popular with owners of light equipment.
The diagram below shows the main engine parts:
- The right side of the crankcase.
- Ball bearing.
- Drive gear.
- Clutch assembly cover.
- Sleeve.
- Cylinder.
- Spark plug.
- The square.
- Block with gland.
- Cam screw.
- Crank base.
- The left side of the crankcase.
- Screw drain.
- A - channel for supplying fuel to the cylinder from the crankcase.
- B - gasket made of aluminum alloy.
Service
As already noted, the unit in question does not require complicated after-sales service. At least every thousand kilometers, it is necessary to remove soot from candles, to control the gap between their electrodes, the tightening force of the fixing nuts on the cylinder. In addition, they adjust the idle speed, clean the magneto, and wash the air cleaner in gasoline.
Every 3 thousand kilometers, they carry out a control test of the ignition unit, lubricate the clutch bearings, and rinse the fuel tank with clean gasoline. Also, with such a run, it is recommended to clean the heads of the block and pistons.
DIY engine repair D6
The most common malfunctions of the considered power unit are malfunctions with the fuel system or the ignition unit. The following is observed:
- On an open throttle, the motor is gaining momentum, but the thrust does not appear. This may be due to slipping of the clutch. It is necessary to repair or replace the element.
- A spark does not appear on the candle, as a result of which the motor does not start. You should check the magneto, as well as make sure that the candle is working and integrity.
- Candles get wet, and the motor runs intermittently. It is necessary to close the fuel supply valve or check the carburetor needle valve.
- The motor does not start. Check and clean the carburetor, if necessary, replace the required parts.
- High voltage current is not induced or a significant attenuation of the spark is observed. It is necessary to replace the core with an induction coil.
Other malfunctions
Repair of the D6 engine may also be required in the following cases:
- The capacitor may cause a short circuit between the gaskets or open connections, as well as poor insulation. You can check the part by connecting it to a 110-127 volt circuit and a 25 W lamp. If the light element lights up, the capacitor has failed and needs to be replaced.
- The breaker malfunctions consist in burning, contamination of the contacts, violation of the gaps between them or deformation of the insulation between the bar and the anvil of the breaker. You can check the element with a battery and a light bulb without removing the breaker. You will need to first disconnect the wire of the induction coil. When connecting one wire from the battery to the bar, and the second to the anvil, the bulb should not light up. If this is not the case, the circuit breaker must be replaced.
- The appearance of cracks in the insulator of the spark plug of the D6 engine, which leads to a short circuit of the electrodes inside the insulator. A similar element is unsuitable for work. The considered problems arise when cold water enters the hot element or if the candle is improperly handled. If the power unit is intermittently or does not start, it is necessary to check the spark plug for a spark. To do this, remove the high voltage wire with the angle of the candle. The last element is twisted, the gasket is removed, the contacts are cleaned of carbon and the gap between the electrodes is checked (it should be 0.4 mm). Then the candle is placed in the square, set it between the ribs of the cylinder and the clutch levers. Raise the rear wheel and crank, watching the appearance of a spark. If it does not appear, the manipulation is repeated with a working candle. If there is no spark at the same time, the fault should be sought in the magneto or high-voltage wire.
Ignition adjustment
Below is the instruction of the D6 engine for setting the ignition. This manipulation involves the provision of gaps on the contacts of the chopper in the ranges of 0.3-0.4 mm, as well as an advance angle of 30 degrees. Before adjusting the system, it is necessary to check the ignition status. This is done as follows:
- The screws are unscrewed, the magneto cover is removed, which is wiped with a clean rag.
- Remove the square with the candle, which turns out.
- The clutch is released by a latch.
To check the gaps between the contacts, insert a screwdriver into the cam slot, rotate it with the rotor until the contacts break completely when the working pad is located on the cylindrical part of the element. Then the gaps are measured with a special plate, the thickness of which is 0.3-0.4 mm. If the indicator is violated, an adjustment must be made.
The main stage of adjustment
The engine D6, the characteristic of which is given above, the adjustment of the gaps is carried out simultaneously with the adjustment of the lead angle. Stages of work:
- Loosen the pair of breaker mounting screws.
- Using a screwdriver placed in a cam slot, rotate the magneto rotor until the risks coincide with a similar core indicator.
- Rotation is performed clockwise, which will avoid loosening the crankshaft fixation .
- The breaker is installed in the position of the beginning of the breaking of contacts, tighten the screws.
- The rotor is turned until the contacts are completely broken, a clearance of 0.3-0.4 mm is set.
- If the indicator is less than required, the rotor is installed as described above. In the case of increased clearance, the breaker is shifted left and down.
At the end of the work make control measurements of the gaps and the lead angle, finally tighten the fixing screws.