Analysis of Various Minor Faults in Diesel Engines of Northern Mercedes Benz Military Vehicle Accessories

Diesel engine minor malfunction registration

1. Difficulty starting diesel engine

(1) There is no oil in the fuel tank or the fuel tank switch is not turned on;

(2) Fuel pipeline or filter blockage;

(3) There is air in the fuel system;

(4) The fuel injection pump does not supply oil or the fuel supply time is incorrect;

(5) The fuel injector does not spray or has poor atomization;

(6) The temperature is too low and the diesel engine is too cold;

(7) Insufficient cylinder compression pressure;

(8) The starter does not rotate or is weak;

(9) The air filter or intake pipe is blocked.

2. Insufficient diesel engine power

(1) Insufficient cylinder compression pressure;

(2) Poor diesel quality or water content in the oil;

(3) Northern Mercedes Benz military vehicle parts air filter clogged;

(4) Muffler blockage;

(5) There is air in the fuel system pipelines and components;

(6) Valve phase error;

(7) Incorrect fuel supply advance angle;

(8) Insufficient fuel injection pressure and poor atomization of the fuel injectors for North Benz military vehicle accessories;

(9) Uneven fuel supply of each cylinder;

(10) The speed has not reached the rated speed

3. Insufficient cylinder compression pressure

(1) The valve clearance is too small or not present;

(2) Carbon accumulation, wear, and poor sealing of valves and valve seats;

(3) The piston ring is worn and lacks elasticity;

(4) The piston ring is stuck due to carbon deposition and cementation;

(5) Wear of cylinder liner and piston, excessive clearance;

(6) Poor sealing of cylinder head gasket;

(7) Air leakage at the fuel injector hole;

(8) Broken valve spring;

(9) The valve and valve guide are stuck due to seizure;

4. The main reasons why the cylinder bed breaks and causes cylinder breakage are:

(1) The inherent quality of the cylinder bed itself is poor;

(2) The oil pressure is too high;

(3) The cylinder head bolts have not reached the specified tightening torque

(4) When installing the cylinder head, the tightening method of the cylinder head bolts was not carried out according to the specified method;

(5) The lower surface of the cylinder head is deformed due to prolonged use;

(6) In addition, burrs, protrusions, and grooves on the upper plane of the engine body and the lower plane of the cylinder head can also create a punching bed;

(7) After the cylinder sleeve is pressed into the engine body, its shoulder height exceeds the tolerance of the plane size on the engine body, and the height difference on the same engine body exceeds the tolerance

5. Why does the valve leak? After the valve leaks, a chattering sound will occur in the cylinder, resulting in a decrease in power. The reasons for this are:

(1) Worn, burnt or dented valve and valve seat sealing surfaces;

(2) Improper adjustment of valve clearance;

(3) Poor atomization or insufficient pressure of the fuel injector results in too much carbon in the sealing area of the valve and valve seat, and the valve cannot be closed tightly;

(4) The valve stem is bent or deformed, or the valve stem part fits too tightly with the guide tube, resulting in resistance when running up and down,

(5) The valve spring is broken or has weakened elasticity, making it difficult to close the valve tightly

6. Why does the piston strike the valve? The piston hitting the valve engine can cause a heavy impact sound. If not eliminated in a timely manner, it can damage the piston and cause a major accident. The main reasons for this malfunction are:

(1) The concave depth of the valve does not meet the technical requirements;

(2) The main bearing nut is loose;

(3) Fusing of connecting rod bearing alloy

(4) The bolts of the camshaft gear pressure plate are loose, causing the camshaft gear to move and causing the valve timing to lose adjustment;

(5) The piston and connecting rod bushing are severely worn, and the fit clearance is too large,

(6) Improper valve clearance;

(7) The timing gear is marked incorrectly or not assembled according to the mark, and the valve timing phase is incorrect;

(8) Broken valve spring;

(9) The depression depth of the valve (the plane of the valve big end is lower than the plane size of the cylinder head) is out of tolerance.

7. Why does the valve break?

After the valve is broken, the valve head will fall into the cylinder, causing the cylinder head and piston crown to rot. If not stopped in a timely manner, it can seriously cause deformation and damage to the connecting rod, crankshaft, and other components.

There are many reasons for valve breakage, in addition to the material and heat treatment issues of the valve itself, there are also the following reasons:

(1) Incorrect valve clearance;

(2) The timing gear is marked incorrectly or not assembled according to the mark, and the valve timing phase is incorrect;

(3) The exhaust temperature is too high;

(4) Broken valve spring;

(5) Valve lock clip not installed properly or missing one;

(6) The bolt of the camshaft gear pressure plate is loose, causing the camshaft gear to move and the valve timing to be misaligned;

(7) The high rotational speed of the diesel engine increases the impact load on the valves, causing them to break;

(8) The disassembly and assembly of the valve lock clip is chaotic and not compatible with each other, which can easily cause the valve to fall off.?

8. Why does the cylinder head produce cracks?

After the cylinder head cracks, cooling water will enter the cylinder and be sprayed out by the exhaust pipe during engine operation.

The main factor causing cylinder head cracks is generally due to uneven heating and cooling. The reasons are:

(1) Incorrect fuel supply time, poor atomization of the fuel injector, and deterioration of combustion;

(2) The cooling water in winter is not fully drained and freezes;

(3) After the water tank of the North Mercedes Benz military vehicle accessories is short of water or cut off, the engine generates high temperature and suddenly cracks with cold water;

(4) The fuel supply of each cylinder of the high-pressure oil pump is uneven, and some cylinders have too much fuel supply, which can also cause cylinder head cracks.

(5) Deviation during casting of the water channel hole on the bottom surface of the cylinder head, poor sand cleaning of the water channel hole, narrow or small corners of the water channel, and poor circulation of cooling water;

(6) Due to improper modification of supporting products, high temperatures can also cause cylinder head cracks.

9. Why does the cylinder liner break?

(1) The internal quality of the cylinder liner does not meet technical requirements, such as low hardness and high sulfur content;

(2) The tightening torque of the cylinder head bolts cannot meet the specified requirements or the end face of the cylinder liner is lower than the sealing surface of the cylinder block during assembly, resulting in floating phenomenon of the cylinder when the piston moves up and down, causing the cylinder liner to fracture;

(3) When installing the cylinder liner, there are debris such as carbon deposits and iron filings at the end of the cylinder block;

(4) The cylinder block hole is deformed due to prolonged use, and the upper and lower parts are not concentric;

(5) There are cracks on the edge of the screw holes around the cylinder block installation cylinder liner, which can cause the cylinder liner head to compress and fracture due to uneven thermal expansion during high-temperature operation of the engine;

(6) Painting during assembly of cylinder liners can also cause them to break;

(7) The upper surface of the cylinder sleeve shoulder is too high above the upper surface of the engine body;


(8) The cutting groove of the cylinder sleeve shoulder should be rounded. If there are no rounded corners or the rounded corners are too small during processing, it can cause stress concentration and easily cause the cylinder sleeve to move from the shoulder(9) Fuel injection pump advancer failure

(10) The exhaust manifold or muffler is blocked, and the engine is accompanied by abnormal noise.

11. Why does a diesel engine emit blue smoke?

Blue smoke is mainly caused by burning engine oil. The reasons for this are:

(1) The piston and cylinder liner are severely worn, and the fit gap is too large, causing oil to enter the cylinder and burn;

(2) Improper assembly of piston rings resulting in alignment;

(3) The valve stem and valve guide are severely worn;

(4) The piston ring and oil ring of the Northern Mercedes Benz military vehicle accessories are damaged or stuck due to excessive carbon accumulation, resulting in the loss of oil scraping function

(5) Adding too much oil, etc

12. Why is there oil in the diesel engine water tank?

The main factors causing oil in the water tank are:

(1) There is an aluminum blind plug in the oil passage of the front cover plate of the diesel engine cylinder head, and the assembly of the aluminum blind plug does not meet the requirements or is missing, causing lubricating oil to enter the water channel;

(2) There are sand holes in the oil duct of the cylinder head on the body that are connected to the water channel, and the purple copper pipe in the oil duct of the cylinder head on the body is loose but not riveted;

(3) There are sand holes, shrinkage or cracks on the oil ducts and water channel walls of the cylinder head;

(4) There are sand holes in the oil cooler cover, cracks in the oil cooler core, poor assembly of the "O" sealing ring of the oil cooler assembly, insufficient elasticity of the "O" rubber ring due to aging, and insufficient processing of the "O" ring groove in the oil cooler core, resulting in insufficient sealing pressure of the "O" ring.

The company mainly sells North Benz military vehicle accessories, such as Baotou Beiben Heavy Duty Truck Accessories, which specializes in the production of all series of non highway rigid dump trucks, including TR100, TR50, TR60, TR353307/3305. The company also offers TEREX spare parts, such as TR100, MT3700, MT4400, MT5500, and TEREX spare parts for mining dump trucks, such as Allison gearbox accessories, Cummins engine accessories, hydraulic seals, high and low voltage harnesses, hydraulic cylinders, and so on Machined parts, gears, Baotou Beiben Heavy Duty Truck accessories chassis series parts.

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