Diesel engine power shortage causes and removing methods
Diesel engine as a result of weakness, bad conditions, indicated that the engine had failed. Reasons as follows: (1) low voltage circuit for the oil shortage, have partially blocked oil and (2) diesel oil in the air, (3) air filter, inlet or cold plug, air resistance increases (4) booster failure; (5) the improper injection time; (6) individual cylinder fuel injector spray bad; (7) water in the diesel, diesel wax; (8) the high pressure pump plunger worn plunger stuck; (9) speed adjustment;
(10) the valve closed strictly; (11) the wear of the cylinder; (12) the exhaust brake valve failure, clogging the exhaust pipe, exhaust is unsuitable. Troubleshooting 1, cleaning and low pressure oil discharge plug fault in a circuit. Low-voltage circuit is the site easy to plug in diesel fuel strainers. As diesel is not clean, or cleaning the coarse filter with fuel tank, cotton yarn, towel, cause strainers clogging. If vehicle is anxious to perform the task, coarse filter can be removed. After completing the mission return to their barracks, then thoroughly clean the diesel of coarse and fine filter coarse filter and fine filter filter replacement. Coarse filter with clean diesel-soaked jams, soak time, compressed air blowing. Note! When cleaning, blow compressed air from the inside to the outside. 2, the Elimination of fuel system not seals. There is air in the circuit are mostly caused by perforation of the low pressure hose. Steyr heavy duty truck low pressure tubing, nylon 111 line, although you can, but afraid of fire. If the pipeline mill out of the hole, or fried in the electric welding the pipeline should be repaired in a timely manner. Repairing method is as follows: perforated pipe disconnected, insert 60mm and oil pipeline internal diameter of copper tube, nylon lines connected both ends fixed with clamp. 3, clean or replace the air filter. Use dry compressed air purging air filter outer filter, if there is oil traces, such as pollution, are to be replaced. 4, repair turbochargers and inlet. As in peacetime operation does not pay much attention, such as starting the car and stop pounding the throttle before, easily in case of poor lubrication of turbocharger rotor in high gear rotor axial and radial clearance increases, individual serious turbocharger bearings burned out. Rotor in axial and radial clearance should be checked. K28, GJ80 maximum axial clearance of 0. 16mm, the maximum radial clearance is 0. 46mm;TA45, K29S3A maximum axial clearance of 0. 025~0. 1mm, the maximum radial clearance for 0,075~0. 18mm。 As the axial clearance is too large, adjust pad method should be used; the radial clearance is too large the supercharger turbine housing or impeller should be replaced. After replacing the impeller dynamic balance calibration should be carried out.
When checking the turbocharger, should pay attention to check pipelines, compressor intercooler intake pipe connections, if the pipeline connecting hoses off, the turbochargers effect is zero, engine weak and vulnerable to early damage of the engine. Check the line when there is no plug, if there should be cleaned. 5, adjust the fuel injection timing. Injection advance angle changes, most of them caused by high pressure oil pump connecting plate fixing screw loose. Should proof injection advance angle again. After adjusting injection advance angle should be fastened high pressure oil pump connection plate bolts to prevent loosening. 6, check and adjust the injector. According to the experience, as long as the use of diesel fuel management, injection pump and injectors rarely fails. If the cylinder injector is bad, burning bad, should be verified. Steyr series heavy duty vehicle engine fuel injector fuel injection pressure of 22.5+0.5MPa, extension of time for use of the engine, fuel injection pressure is adjusted to 22.0+0.5MPa. 7, out of water in the fuel tank to replace substandard diesel. At the time of the season, such improper grade of Steyr series heavy duty vehicle diesel oil, wax-is very easy to produce diesel fuel in the tank, open the tank cap, you will see the oil surface crystalline wax. Solutions are within the garage will be towed to the nearest higher room temperature, wait for the wax to melt oil out, replaced qualified grades of diesel fuel and clean diesel fuel filter, the fuel tank; steam heated tank, pipelines, filters can also be used, after the temperature, release the oil. If there is water in the pipeline, you should drain the water, by opening the vent screw on the high pressure pump, diesel fuel filter, pump oil drain by hand until the water is drained and the water and oil mix part so far. As mentioned earlier, every shift, and before driving should swing open the lower part of the primary fuel oil filter plug, drain the water and impurities. 8, replace the plunger, and check adjustment of fuel injection pump on the platform. 9, adjust the speed. If there was a fault, it should remove the Governor and repair, and Colonel in the injection pump test bench check adjustments. 10, if the valve closes is not strict, should pay attention to adjust the valve clearance again. Such a failure, with the engine running, there will be "da da" sound, speed higher, louder, particularly severe cold. Valve clearance when changes occur, should pay attention to check whether the valve spring break. Such as single-cylinder valve clearance change, can be used by single-cylinder proof: move the flywheel until the check valves of the cylinder when the piston reaches top dead Center (after the outlet of the high pressure oil pump removal, injection time), intake and exhaust valves are closed, then Gage calibration. Intake valve clearance (cold): 0.3mm exhaust valve clearance (cold): 0.4mm while it is in two-level maintenance for the third time, dealing with all the valve clearances checked again. Wheel marks on the piston before the first stop point injection timing check. When the 1-cylinder injection timing, 1, 6 cylinder piston is at TDC, after viewing tappet lift and check valve. First intake valve: 1, 2, 4-exhaust valves: 1, 3, 5, engine fly wheel 360 °, the 6th cylinder power stroke starting point, proof the following valves: Second intake port: 3, 5, 6 Exhaust valve: 2, 4, 6 Two proof is complete.
11, worn piston rings, resulting in poor cylinder, piston rings should be replaced, and check gap between piston and cylinder. If an individual cylinder piston ring is worn or broken, can be replaced individually. Remove the cylinder cover and replace the piston rings, piston ring gap for the following values: First the ring: 0.40~0.60mm second ring: 0.25~0.40mm oil ring: 0.35~0.55mm during installation, pay attention to the piston ring, should be staggered 120 °. When you install the connecting rod, should pay attention to shaft wear. Connecting rod bolt tightening force for 120Nm+90 90 (corner), the corner should reach 170~250Nm; when installing the cylinder, cylinder head bolts tightening force is: Bolt: 240~340Nm supporting bolt: 120~160Nm.
Source: http://www.mesmaxuk.com/
