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Video Diesel Engine 1
Video Diesel Engine 2
Video Petrol/Diesel Engine
Video Save Energy
Video Inventor Rudolf Diesel
Video Crosshead Engine
Video Diesel Engine (truck)
Video Work at Truck Engine
Video Combustion Engine
Video Compression Ignition
Video Direct Injection
Video Side Comb. Chamber
Video Diesel Fuel
Video Not running
Video Test diagnostic
Video Injection Nozzle Tests
Video Pump Injectors
Video Particulate Filter
Video Two-stroke Engine
Video Marine engines 1
Video Marine engines 2
Video V-10 Diesel Engine
Video Internal Mixt. Form.
Video Mixture Preparation
Video Supply Pump
Video Diesel injection 2012

Video Common Rail 1
Video Common Rail 2
Video Common Rail 3
Video Common Rail 4
Video Common Rail 5
Video Common Rail 6
Video Common Rail 7
Video Common Rail 8
Video Common Rail 9
Video Common Rail 10

Video Fuel supply 2
Video Fuel supply 3
Video Repair 1
Video Repair 2
Video Repair 3
Video Throttle Pintle Nozzle
Video Hole Type Nozzle
Video Glowing System 1
Video Glowing System 2
Video Glowing System 3
Video Glowing Plug Sensor
Video Hole Type Nozzle
Video Injection Nozzle Tests
Video Injection Pump Test
Video Pump Injectors 1
Video Pump Injectors 2
Video Pump Injectors 3
Video Diesel Fuel Filter 1
Video Diesel Fuel Filter 2
Video Reverse Running
Video Fuel Cooling
Video In-line Inj. Pump
Video Injection Pump
Video In-line Pump (classic)
Video In-line Pump (P-type)
Video In-line Pump (M-type)
Video In-line Pump 4
Video In-line Pump 5
Video In-line Pump 6
Video In-line Pump 7
Video Centrifugal Governor
Video Fuel Piston Pump
Video Electr. Inline Pump
Video Distr. Type Pump 1
Video Distr. Type Pump 2
Video Axial Distr. Pump 1
Video Axial Distr. Pump 2
Video Axial Distr. Pump 3
Video Axial Distr. Pump 4
Video Axial Distr. Pump 5
Video Radial Distr. Pump 1
Video Radial Distr. Pump 2
Video Radial Distr. Pump 3
Video Electr. Diesel Control
Video Centrifugal Governor
Video Press. Red. Valve
Video Blocking-vane Pump
Video Fuel Filter - Hand Pump
Video Diesel Fuel
Video Fuel Preheating

Video Diesel Processes 1
Video Diesel Processes 2
Video Diesel Processes 3
Video Diesel Processes 4
Video Diesel Injection 1
Video Diesel Injection 2
Video In-line Injection Pump
Video Distributor Pump 1
Video Distributor Pump 2

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Diesel Engine (test, diagnostic)


Working on the Diesel engine becomes necessary when:
- it is difficult to start,
- the results of the exhaust gas testing are unsatisfactory,
- the exhaust gas is discoloured,
- the fuel consumption is too high,
- unusual noises from the engine (especially when it is warm).


Blueish exhaust fumes are always an indicator of oil in the exhaust gas. In this case, a close look at the compression is wise. The first, and in some modern engines only possible test, is the electronic testing of the current flow to the starter, which must be carried out during the individual compression strokes.
Should a test with dismantled glow-equipment not be possible, then, in the case of the injection pump, the piping between the pump and the nozzle must be removed, with the Common Rail, the entire fuel-rail (see picture) must be dismantled. To distinguish between a defect, e.g., between worn out cylinder sleeves or leaky valve-guides, a pressure-loss test should be carried out. If the engine is unwilling to start, the procedure is similar, however, in the case of the side-combustion chamber system, the glow-system must first be checked. Loud knocking noises are also a result of something wrong in the glow-system. Should the noises persist, even when the engine is warm, there may be a defect in the regulation system (delivery begin) or the Cetan value may be wrong e.g., through too much petrol in the fuel.

In particular the older Diesel engines indicate that all is not well by sooting heavily (black exhaust fumes).They are produced by too much fuel or too little air-supply. Therefore, the air-filter should first be checked, then the injection system. In this case, either the regulation (wrong injection begin) is defective or the injection nozzles have a post injection drip.
The best way to find a defective nozzle in individual injection lines, is to loosen the nut while the engine is running. If the running of the engine doesn't change, then this cylinder is doing nothing to stabilize the performance, then obviously something is amiss here. Defective nozzles can also be discovered when checking for oil-leakage. If more fuel flows from one than from the other nozzles, then the nozzle-needle is worn out.

Slight varying during the exhaust gas testing can be compensated by an idling value at the maximum tolerance limit or a full-load RPM at the minimum tolerance limit. When working on the injection system, with the very high pressures common today, one must pay particular attention to the prescribed torque values when re-assembling. requirements, because of substantial pressure in the system nowadays.


1. In the case of unfavourable exhaust values, the air-filter should always be checked first, only then should the injection system or the engine (e.g., the compression) be examined.
2. The exhaust gases from the Diesel engine, e.g., during a turpidity test, should be taken up as completely as possible and conducted into the open air by the extractor fan.
3. Of course, the noise pullution level my only exceed the average limit a few times a day (less than 10 times). 09/11               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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