Domestic motorcycle engine D6 is a two-stroke engine with one cylinder. The unit has a carburetor supply system, it is installed on different models of mopeds. Due to the simplicity of design and versatility, the power plant is often used on light agricultural equipment or various kinds of motor homemade products. Consider the parameters, features, and repair of this unit.
D6 engine: specifications
The following are the parameters of the technical plan of the unit in question:
- Type - in-line.
- Injection - carburetor.
- Cylinder block material is aluminium.
- The number of cylinders is one.
- Power rating - 1 horsepower at 4500 rpm.
- Piston travel - 40 mm.
- Carburetor type - 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 versions: D6 and D6U. The design of these motors is identical, but the chains of rotation are different. The power unit has atmospheric cooling, which gavethe possibility of significantly simplifying its design. The ingenious placement of the combustion chamber solved the problem of excessive heat load without the need for an additional finned cylinder to increase cooling efficiency.
Standard carburetors and power unit are reliable and economical, which reduced the cost of operating the motor. The carburetor itself does not require special maintenance, especially if the proportions are observed when preparing the fuel mixture and timely preventive maintenance is carried out.
Features
The D6 engine, the diagram of which is shown below, due to the simplicity of the design, can be easily adapted to the frame of the equipment by means of fixing clamps. Torque to the rear wheels is generated by clutches and a suitable roller chain. In this design, a gearbox is not provided, the operation of the motor is controlled using the throttle handle, mechanically connected to the carburetor.
The D6 engine, despite its small working volume and compact dimensions, provides good dynamic performance to light two-wheeled vehicles. On flat terrain, the moped can accelerate up to 40 km/h. Thanks to the traction reserve, the machine can be operated on rural roads without problems. Despite the fact that more than 50 years have passed since the creation of the motor, it is still popular with owners of light vehicles.
The diagram below shows the main parts of the engine:
- Right side of crankcase.
- Ballbearing.
- Drive gear.
- Clutch cover.
- Sleeve.
- Cylinder.
- Spark plug.
- Square.
- Gland block.
- Cam screw.
- Crank base.
- Left side of crankcase.
- Drain screw.
- A - channel for supplying fuel to the cylinder from the crankcase.
- B - aluminum alloy spacer.
Maintenance
As already noted, the unit in question does not require complex service. At least every thousand kilometers, it is necessary to remove carbon deposits from candles, control the gap between their electrodes, the tightening force of the fixing nuts on the cylinder. In addition, they carry out idle speed adjustment, clean the magneto, wash the air cleaner in gasoline.
Every 3,000 kilometers, check the ignition assembly, lubricate the clutch bearings, and flush the fuel tank with clean gasoline. Also, with such a run, it is recommended to clean the heads of the block and pistons.
DIY D6 engine repair
The most common malfunctions in the power unit in question are problems with the fuel system or the ignition unit. The following is observed:
- At open throttle, the motor picks up speed, but there is no thrust. This may be due to a slipping clutch. The element needs to be repaired or replaced.
- The spark plug does not spark, causing the engine to not start. You should check the magneto, as well as make sure that the candle is working and intact.
- The spark plugs get wet and the motor runs intermittently. You need to close the fuel supply valve or check the carburetor needle valve.
- The engine does not start. Check and clean the carburetor, if necessary, replace the required parts.
- High voltage current is not induced, or a significant weakening of the spark is observed. The induction coil core needs to be replaced.
Other malfunctions
D6 engine repair may also be required in the following cases:
- The capacitor may have a short circuit between gaskets or broken 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.
- Breaker malfunctions are burning, contamination of 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 light should not light up. If not, the breaker must be replaced.
- The appearance of cracks on the insulator of the D6 engine spark plug, whichleads to a short circuit of the electrodes inside the insulator. Such an element is not suitable for work. The problems under consideration occur when cold water gets on a hot element or when the candle is mishandled. If the power unit is intermittent or does not start, check the spark plug for a spark. To do this, remove the high voltage wire with the square of the candle. The last element is unscrewed, the gasket is removed, the contacts are cleaned of carbon deposits and the gap between the electrodes is checked (it should be 0.4 mm). Then the candle is placed in a square, installed between the ribs of the cylinder and the clutch levers. Raise the rear wheel and turn, watching for the appearance of a spark. If it does not appear, the manipulation is repeated with a working candle. If there is still no spark, the fault should be in the magneto or high voltage wire.
Ignition adjustment
Below is the instruction of the D6 engine for setting the ignition. This manipulation involves providing gaps on the breaker contacts in the ranges of 0.3-0.4 mm, as well as a lead angle of 30 degrees. Before correcting the system, it is necessary to check the ignition condition. This is done as follows:
- The screws are unscrewed, the magneto cover is removed, which is wiped with a clean rag.
- The square is removed with a candle that turns inside out.
- Clutch disengages by latch.
To check the gaps between the contacts, insert a screwdriver into the slotcam, rotate it with the rotor until the contacts are completely broken, 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, it is necessary to make an adjustment.
Main adjustment step
For the D6 engine, the characteristics of which are given above, the clearance adjustment is carried out simultaneously with the advance angle adjustment. Work steps:
- Loosen a pair of breaker mounting screws.
- Using a screwdriver placed in the cam slot, rotate the magneto rotor until the risks coincide with the same core indicator.
- Rotation is clockwise to avoid loosening of the crankshaft.
- The breaker is set to the position where the contacts start to break, the screws are tightened.
- The rotor is turned until the contacts are completely broken, the gap is set to 0.3-0.4 mm.
- If the indicator is less than required, the rotor is installed as described above. In the case of an increased gap, the breaker is shifted to the left and down.
At the end of the work, make control measurements of the gaps and the lead angle, finally tighten the fixing screws.
