1. Deutz diesel engine is difficult to start
(1) There is no fuel in the fuel tank or the fuel tank switch is not turned on;
(2) Fuel lines or filters are blocked;
(3) There is air in the fuel system;
(4) The fuel injection pump is not supplied The oil or fuel supply time is incorrect;
(5) The fuel injector does not spray or the atomization is bad;
(6) The temperature is too low and the Deutz diesel engine is too cold;
(7) The cylinder compression pressure is insufficient;
(8) The starter does not rotate Or weak;
(9) Air filter or air inlet pipe is blocked.
2. Deutz diesel engine has insufficient power.
(1) Insufficient cylinder compression pressure.
(2) Poor diesel quality or water in oil.
(3) Air filter is blocked.
(4) Muffler is blocked.
(5) Fuel system piping. with air within the device;
(6) with gas phase error;
(7) does not supply advance angle;
insufficient (8) injector fuel injection pressure, poor atomization;
unevenness (9) of each cylinder fuel supply;
( 10) The speed does not reach the rated speed;
3 , the cylinder compression pressure is insufficient
(1) the valve clearance is too small or absent;
(2) the valve and valve seat carbon deposits, wear, and poor sealing;
(3) the piston ring is worn and the elasticity is insufficient;
( 4) The piston ring is stuck with carbon deposits;
(5) The cylinder liner and the piston are worn and the gap is too large;
(6) The cylinder head gasket is not tightly sealed;
(7) Air leaks at the injector hole;
(8) Valve Spring break
(9) The valve and valve guide are stuck and stuck;
4. Why does the cylinder bed break?
The main reasons for the cylinder burst are:
(1) the inherent quality of the cylinder bed itself is not good;
(2) the oil pressure is too high;
(3) the cylinder head bolts do not reach the specified tightening torque;
(4) when the cylinder head is installed, the cylinder head The method of tightening the bolts was not carried out according to the prescribed method;
(5) The lower surface of the cylinder head is deformed due to the long use time; ()
(6) In addition, there are burrs on the upper plane of the body and the lower plane of the cylinder head, and the bosses and grooves will also impact. Cylinder bed;
(7) After the cylinder sleeve is pressed into the body, its shoulders are higher than the plane size on the body, and the height difference on the same body is too bad.
5. Why does the valve leak?
After the valve is leaking, the sound of 喳 喳 ， will occur in the cylinder, resulting in a decrease in power. The reasons are:
(1) the valve and valve seat sealing surfaces are worn, burned or have pits;
(2) the valve clearance is not adjusted properly;
(3) the nozzle and valve seat are not properly atomized or the pressure is insufficient There is too much carbon in the sealing area to close tightly;
(4) The valve stem is bent or deformed or the valve stem is too tightly fitted with the duct, and there is resistance when running up and down
.
6. Why does the piston hit the valve?
A heavy impact sound occurs when a piston hits a valve engine. If it is not removed in time, the piston will be damaged and a major accident will occur. The main reasons for this kind of failure are:
(1) The depth of the depression of the valve does not meet the technical requirements;
(2) The main bearing nut is loose;
(3) The connecting rod pad alloy is melted or falls off;
(4) The camshaft gear pressure plate bolt is loose , Camshaft gear shifting, resulting in misalignment of gas distribution phase;
(5) Pistons and connecting rod bushings are severely punished for wear, and the clearance is too large,
(6) Incorrect valve clearance;
(7) The timing gear is not marked correctly or is not assembled according to the mark, the gas distribution phase is incorrect;
(8) The valve The spring is broken;
(9) The recessed depth of the valve (the plane of the large end of the valve is lower than the plane size of the cylinder head) is too poor.
7. Why does the valve break?
After the valve is broken, the valve head will fall into the cylinder and cause the cylinder head and piston top to rot. If it is not stopped in time, the connecting rod and crankshaft will be deformed and damaged.
There are many factors for valve breakage. In addition to the material and heat treatment of the valve itself, there are the following reasons:
(1) The valve clearance is incorrect;
(2) The timing gear mark is wrong or not assembled according to the mark, and the gas distribution phase is incorrect. ;
(3) the exhaust gas temperature is too high;
(4) a valve spring break;
(5) is not installed air lock folder means a less;
(6) the cam gear platen bolts loose, causing the cam gear traverse, with Gas phase misalignment;
(7) Deutz diesel engine's excessively high speed “speeding” increases the impact load of the valve, causing the valve to break;
(8) Disassembly and disassembly of the valve lock clips, which are not compatible with each other, can easily cause the valve to fall off.
8. Why is there a crack in the cylinder head?
After the cylinder head is cracked, the cooling water will enter the cylinder, and when the engine is running, it will be ejected from the exhaust pipe. The main cause of cracks in cylinder heads is generally caused by uneven hot and cold. The reasons are:
(1) Incorrect fuel supply time, poor atomization of the fuel injection nozzle, and deterioration of combustion;
(2) The cooling water has not been exhausted and cracked in winter;
(3) The engine has a high temperature after the water tank is short of water or the water is cut off. cracking;
(4) high-pressure fuel supply pump variation of each cylinder, some cylinders fuel supply amount is too large, cracking will produce the cylinder head.
(5) when the bottom surface of the cylinder head casting deviation channel pore, channel pore sand net, corners or narrow waterways too small, poor cooling water circulation;
(6) Modification of the product since the supporting unreasonable, resulting in temperature can also cause cracking head .
9. Why does the cylinder liner break?
(1) The internal quality of the
cylinder liner does not meet the technical requirements, such as low hardness, high sulfur content, etc .; (2) The tightening torque of the cylinder head bolts fails to meet the specified requirements or the cylinder liner end face is lower than the cylinder block stop plane when assembled, therefore When the cylinder moves up and down, the cylinder has a floating phenomenon, which causes the cylinder liner to break;
(3) When the cylinder liner is installed, there are debris such as carbon deposits and iron filings at the end of the cylinder block;
(4) The cylinder body hole is deformed due to the long use time. Not concentric;
(5) There are cracks on the edges of the screw holes around the cylinder block installation cylinder liner. In this way, the cylinder head is crushed and broken due to uneven thermal expansion of the engine during high temperature operation;
(6) Paint is applied when the cylinder liner is assembled It will also break the cylinder liner;
(7) The plane on the cylinder liner shoulder is too high above the body;
(8) The groove on the cylinder liner shoulder should be rounded. If there are no rounded corners or the corners are too small during processing, It is easy to cause the stress concentration to cause the cylinder liner to break from the shoulder;
(9) The use of a poor-quality cylinder bed will also cause the cylinder liner to break;
(10) The cylinder block liner of the machine body is not horizontal during processing and the stop is not chamfered.
10. Why does Deutz diesel engine emit black smoke?
After a long period of use, Deutz diesel may smoke, affecting the working environment, causing air pollution, and the power is significantly reduced. The main reasons are:
(1) The engine is overloaded for a long time;
(2) Insufficient combustion due to insufficient pressure or poor atomization of the injector;
(3) The fuel supply angle is too late, and the exhaust pipe burns;
(4) The oil supply of the high-pressure oil pump is too large or the oil supply of each cylinder is uneven;
(5) The air filter and the air inlet are blocked and the air intake is not smooth;
(6) Use of heavy diesel or poor quality diesel;
(7) Insufficient air leakage of the valve airtight seal;
(8) Excessive cam wear on the camshaft;
(9) Failure of the fuel injection pump advancer;
(10) Exhaust gas The tube or muffler is blocked and the engine is accompanied by abnormal noise.
11. Why does Deutz diesel engine emit blue smoke?
Blue smoke is mainly caused by burning oil. The reasons are:
(1) The piston and the cylinder liner are heavily worn, and the clearance is too large, and the oil enters the cylinder to burn;
(2) The piston ring is improperly assembled;
(3) The valve rod and valve guide are seriously worn;
(4) The piston ring The oil ring is damaged or stuck due to more carbon deposits and loses the function of scraping oil;
(5) Too much oil is added.
12. Why is there organic oil in the water tank of Deutz diesel engines?
The main factors causing the organic oil in the water tank are:
(1) there is aluminum plug in the oil passage in the front cover of the cylinder head of Deutz diesel engine. The aluminum plug is not fitted or is leaking, and the oil enters the water channel;
(2) on the body There is trachoma in the oil passage of the cylinder head, which communicates with the water channel. The copper tube in the oil passage hole of the cylinder head is loose and not riveted;
(3) There are trachoma, shrinkage or cracks in the
oil passage and water wall of the cylinder head; (4) Oil cooler cover There are trachoma, cracks in the oil cooler core, the oil cooler assembly "O" seal ring is not well assembled, the "O" rubber ring has insufficient aging elasticity, and the oil cooler core "O" ring groove processing is too deep and poor. The "O" ring seal pressure is insufficient.
13. Why is there water in the oil pan?
After entering the cooling water in the oil pan, the engine oil deteriorates, and the main reasons for the water in the oil pan are:
(1) the water blocking ring of the cylinder liner is melted or aged and ruptured;
(2) the cylinder head has cracks and water leakage;
(3) Wet cylinder liner is cracked or loose with sand holes
(4) Wet cylinder liner is broken;
(5) There are casting defects such as cracks in the body cavity or trachoma shrinkage;
(6) Quality problems with oil coolers, Daoyi When the diesel engine is not operating, water flows into the sump.
14. Why does the bearing bush melt?
After the bearing shell is melted, the crankshaft is damaged, and the connecting rod is deformed. If it is not stopped in time, the connecting rod screw will be severely broken and the body will be broken. The reasons for the burning of the tiles are:
(1) the amount of oil in the oil pan is insufficient or the oil circuit is not smooth, resulting in poor lubrication;
(2) the oil pressure is too low;
(3) the oil is too dirty during use, Water, diesel fuel, engine oil is aging, engine oil type is wrong;
(4) Leakage of oil seal pipe joints and oil lubrication parts of Deutz diesel engine external configuration;
(5) Oil filter plugged, oil cooler blocked;
(6) Oil collection The filter is not welded firmly.
(7) The oil suction pipe is broken, and the oil suction pipe lock nut is loose;
(8) The rotor of the oil pump is broken, and the pump shaft is broken, which will cause burns;
(9) The bearing bush and the journal The assembly gap is too large or too small, so that a certain oil film cannot be formed when the oil is lubricated;
(10) The ovality of the journal exceeds a certain requirement, which also makes the oil unable to form an oil film;
(11) The bearing alloy and the tile are not cast strong, fall off in high-speed movement;
(12) and the main connecting rod bearing nut screw tightening torque does not reach a predetermined torque;
(13) of the body and the crankshaft cleanliness during assembly to less technology ;
(14) and the crank hole inclined oil passage hole drilled through the body;
(15) Deutz starter just not been fully lubricated oil, let Deutz speed operation;
(16) 4110 engine piston cooling nozzle Break or fall off.
15. Why does the speed of Deutz diesel engines not increase, and the car does not run fast?
(1) The high-pressure fuel pump throttle lever cannot reach the maximum position, that is, the maximum fuel supply. The maximum idling speed of the Deutz diesel engine is lower than the calibrated value and the speed is low;
(2) There is air in the fuel pipeline system;
(3) The fuel pipe The road or diesel filter is blocked, the small filter of the fuel pump is blocked, and the fuel supply is insufficient;
(4) the air filter is blocked and the intake air is insufficient;
(5) the carbon deposits in the fuel injection nozzles are bitten;
(6) the high pressure Early wear of the oil pump plunger.
16. Why does Deutz diesel engine oil consumption increase?
(1) The piston ring is stuck and sintered in the piston groove, and the oil return hole of the oil ring is blocked by carbon deposits;
(2) The elasticity of the piston ring is insufficient;
(3) The piston ring, piston and cylinder liner are seriously worn or the cylinder is pulled , series of oil into the combustion chamber of combustion;
improper (4) piston assembly, generating counterpart, the second rings mounted trans; opening position right oil ring;
(5) increase too much oil, the oil splashed too, some Burned into the combustion chamber;
(6) The cork pad of the oil pan is damaged or the oil drain screw leaks, resulting in increased oil consumption;
(7) The bottom hole of the cylinder block cylinder liner is out of round;
(8) The cylinder is fitted into the bottom of the cylinder liner Out-of-roundness in the hole;
(9) Valve oil seal failure;
(10) Out-of-roundness of the cylinder head valve guide hole;
(11) Excessive clearance between the piston and the cylinder liner;
(12) Large clearance between the valve guide and the valve stem, The oil that lubricates the gas distribution mechanism enters the combustion chamber;
(13) The lubrication of the gas distribution mechanism transitions, and the oil flows into the combustion chamber from the gap between the valve stem and the valve guide.
17. Why does the crankshaft of Deutz diesel engine break during use?
In the normal use of the crankshaft, it is generally not broken, because the crankshaft has been designed to have sufficient strength, and it must undergo strict flaw detection and balance inspection and measurement. The causes of crankshaft fracture are:
(1) trachoma and looseness under the
crankshaft ; (2) the physical properties, chemical properties, and metallographic structure of the crankshaft material do not meet the requirements;
(3) the engine is overloaded for a long time, due to fatigue transition. crankshaft fracture;
(4) main bearing lock nut loose sheet or unlocked;
(5) oil dirty, poor lubrication conditions, resulting in melt fracture tile axle;
(6) grinding the crank watts with increase, since the journal The R angle is broken and ground to a right angle, and the crankshaft undergoes a reduction in strength to cause fracture;
(7) The main bearing cover is broken due to material or processing reasons;
(8) The clutch is not used at the power output end of the Deutz diesel engine, so that the crankshaft is subjected to a perpendicular to the crankshaft The force acting in the direction of the centerline causes fatigue fracture of the rear end of the crankshaft.
18. The water temperature of Deutz diesel engine is too high
(1) The pump fan belt is too loose, and the amount of pump water is reduced;
(2) The overload time of Deutz diesel engine is too long;
(3) The cooling water is insufficient;
(4) The water pump pump is insufficient, Insufficient circulating water;
(5) Water pump impeller damaged, water pump impeller and water pump shaft loosened, water pump pulley roll key, water pump bearing seized;
(6) cooling system blocked, cooling water flow is not smooth;
(7) thermostat fails;
(8) The water temperature sensor plug is malfunctioning or the reaction is not sensitive;
(9) Poor lubrication and high oil temperature;
(10) The fan is installed in the reverse direction;
(11) The space between the radiator fins of the water tank is blocked by dirt and affects the ventilation;
(12) ) The size of the heat dissipation area of the water tank is unreasonable;
(13) The modification of automobiles or agricultural machinery is unreasonable, and the windward side of the water tank is blocked too much;
(14) The water tank has no air hood;
(15) When the Deutz diesel engine is used for fixed power, the ambient temperature is too high due to poor ventilation, or it should be equipped with open-type circulating water to cool it.
19 , the oil pressure is too low
(1) insufficient oil in the oil pan;
(2) the oil pressure alarm fails or the response is not sensitive;
(3) the oil pressure gauge and the oil pressure sensing plug are not compatible;
(4) the oil channel is blocked ;
(5) the oil pump suction filter clogging;
(6) clogging of the oil filter, valve malfunction;
(7) Deutz main bearing connecting rod bearing wear, the gap increases;
(8) overheating Deutz , The oil temperature is high, the oil becomes thin;
(9) the gap between the gear of the oil pump and the housing or the gap on the tooth side is too large;
(10) the pump body has trachoma and loose oil;
(11) the used oil Incorrect grade;
(12) 495 machine gasket is not installed or damaged, and oil leaks out of the gap;
(13) 495 oil suction pipe large nut is loose and leaks oil;
(14) crankshaft oblique oil hole, body main oil hole is drilled or There are trachoma;
(15) The opening pressure of the oil return valve on the oil filter is too low, causing the oil to return to the oil prematurely, which affects the oil pressure of the entire lubrication system;
(16) The oil filter and oil pump pressure limiting valve are worn , Insufficient spring force, deformation, breakage, And a mating lax;.
(17) with the oil pump drive shaft with loose oil pump drive gear;
(18) oil pressure alarm oil duct blockage, resulting in inaccurate measurements.
20 , Deutz percussive sound (1) gross fuel with crisp percussion within the cylinder;
(2) Slow combustion and the "fire" of the exhaust pipe;
(3) The gap between the piston and the cylinder liner increases, making a dull, knocking sound sometimes like a shovel;
(4) The gap between the crankshaft and the main bearing increases, and the cycle is issued of heavy percussion;
(5) with the crankshaft connecting rod journal bearing clearance increases, clashed blunt dumb;
(6) the piston rod bushing and the pin a gap is too large, a "coupons" sound, and the sound intensity Sharp;
(7) The valve clearance is too large, and a "Dada" sound is issued;
(8) The valve hits the piston crown and makes a crisp impact sound.
20. Why does Deutz diesel engine suddenly stop during operation?
Deutz diesel engines suddenly stop during operation due to the following conditions:
(1) fuel in the diesel tank runs out;
(2) air and water in the fuel line;
(3) the air filter is blocked;
(4) diesel The filter is clogged, and the small filter in the oil inlet screw of the fuel pump is too dirty and blocked, and the fuel cannot enter the high-pressure oil pump;
(5) The high-pressure oil pump rack is stuck;
(6) The piston and piston ring are stuck in the cylinder, and the crankshaft The brake shoes, the crankshaft was broken, and the connecting rod screws were broken to break the body, causing the engine to stop suddenly.
21. Why does the connecting rod screw break and break the body?
After the side bolts are completely processed, they must be inspected magnetically one by one, and their chemical composition and mechanical properties are also strictly controlled. The reasons for the break of the side bolts are:
(1) The connecting rod bolts are not tightened to the specified working torque during assembly, and the 4102 machine has a tightening torque of 100-120 N.m. ;
(2) link for some reason blow tile, the increased clearance between the rod and the rod bearing journal an impact force to break;
(3) the link lock is damaged or not securely latched;
(4) The thread of the connecting rod body and the connecting rod bolt are damaged or unclean. Although the torque is relatively large when turning the connecting rod bolt, it does not actually reach the specified torque value, resulting in a false kilogram value. Due to the gap between the connecting rod covers, they are pulled off during operation;
(5) The connecting rod bolts are tightened too tightly, and the tightening torque exceeds the calibration range, so that the force on the connecting rod bolts exceeds the elastic limit of the bolt material. .
22. Why is the amount of lubricant on the rocker shaft too small or no lubricant?
The reasons for the lack of lubricating oil on the rocker shaft are:
(1) the oil pump is not working or is not working well, the pressure of the inorganic oil or the oil is low;
(2) the oil hole of the rocker seat is not accessible;
(3) the oil hole of the arm seat is due to iron filings, Miscellaneous objects ca n’t get up the oil;
(4) The assembly position of the rocker arm is reversed due to assembly errors during repair and maintenance, and the oil hole is blocked;
(5) The front bush of the camshaft moves and the oil hole position is shifted;
(6) The displacement of the pump oil groove on the camshaft or the width, depth, and length of the pump oil groove is insufficient;
(7) The rocker arm bolts with oil holes are not tightened, and the oil leaks from the bottom surface of the rocker arm seat;
(8) Shake during assembly The oil hole of the arm shaft is not aligned with the oil hole of the rocker arm seat or the rock bolt of the rocker shaft is loosened, and the oil hole cannot be aligned.
23. Why does the rocker shaft break?
Fracture rocker shaft reasons are:
(1) pressing the rocker seat nut loose, improper tightening sequence;
(2) the rocker shaft poor lubrication, killed;
(2) when the maintenance counter-arm base mounted, the cylinder head oil gallery oil able to come;
(3) in the rocker shaft lubrication hole drilling drill unilateral strength is insufficient;
(4) the rocker arm shaft hole edge cracks during the heat treatment.
24. Why does the rocker arm break?
The rocker base is a support that supports the rocker shaft, valve rocker, and decompression shaft. The causes of the rocker base fracture are:
(1) the tightening force of the rocker base compression nut is not enough;
(2) the four rocker arms The seat has three different structures, so they cannot be reversed during assembly. The first (the one near the water pump) has a small oil hole at the bottom of the rocker arm, which is the only way for the cylinder pad oil passage to the rocker shaft oil hole. Wrong will cause oil break, which will cause the rocker shaft and valve rocker to bite and break the rocker seat;
(3) When the first screw on the rocker seat does not point into the rocker shaft gap or shake The end of the arm shaft is installed with a retaining ring, which will cause the rocker shaft to rotate or move in series, which will also cause the rocker seat to break;
(4) If the valve clearance is too small or absent, the rocker seat will receive additional impact force, Break the rocker
