oil dilution in diesel engine
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21-10-2010, 10:01 PM

i m doing seminar and presentation on the topic oil dilution in diesel engine.i know about the causes and effect of oil dilution.can someone suggest me some methods to minimize it. i will be very thankful.
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27-10-2010, 09:36 AM

Preparede by:
A. T. Wilford, B.Sc., A.R.C.S., A.I.C., M.Inst.P.T.
Matthew J. Thornton, Teresa L. Alleman, Jon Luecke and Robert L. McCormick


DILUTION OF DIESEL ENGINE LUBRICATING OIL DETERMINATION OF DILUTION By A. T. WILFORD, B.Se., A.R.C.S., A.I.C., M.Inst.P.T. S17MMARY. IN this paper the determination of dilution of crankcase oil from Diesel engines is discussed from the standpoint of a large operator of oil-engined vehicles. High-speed oil engines may be divided into two classes, viz. those which give rise to little or no dilution and those in which dilution gradually increases, eventually reaching very high proportions.There is considerable evidence that with either class of engine, dilution does not exhibit seasonal variation.In the case of the " non-diluting " types of engines, viscosity increase will determine when the oil must be changed; in the other class, dilution will be the determining factor. A fundamental difficulty with crankcase oil from either class of engine (but particularly the " non-diluting " type) is that the diluent is of high boiling range and overlaps the lower fractions of the lubricating oil. A survey of methods which might be employed to determine dilution leads to the conclusion that only those based on vacuum or steam distillation are practicable. The first mentioned is rejected as unsuitable for routine purposes, the necessary apparatus being much too complicated. The objections to a steam distillation method are frankly admitted, but are regarded as counterbalanced by comparative simplicity and reasonable rapidity, whilst the degree of accuracy attainable is certainly sufficient for all practical purposes. The standard A.S.T.M.Dilution A.S.T.M. Dilution Trap Method is shown to be inapplicable, but a suggestion is put forward that the principle might be retained were it possible to substitute a suitable highboiling liquid for the water normally employed. A method which has been worked out for routine determinations, where both unused lubricating oil and fuel are known factors, is as follows 100 ml. crankcase oil is steam distilled at 210 C.Volume of oil distillate recovered with 200 ml. of water is recorded and converted to dilution by reference to a graph or by formula derived therefrom.Time for complete determination-46 mina. The graph was prepared by employing the method on known mixtures of lubricating oil and fuel, the relationship between oil distillate and dilution following a straight-line law up to at least 50% dilution.The " blank " of the lubricating oil (i.e. oil distillate at no dilution) is an important factor, but for a par ticular oil is allowed for in the graph or formula.Where it is not desired to construct a graph, the same method may be employed, but 400. ml. of water must be recovered. A determination is carried out on the unused oil and then on the crank case oil itself, dilution (D) being calculated by the formula 17 - bD _100b X 100, where d is volume oil distillate from crank case oil and b is volume oil,distillate (" blank ") from unused oil. It is shown that the " blank " varies with different oils, and whilst an average "

Increasing interest in biofuels—specifically, biodiesel as a pathway to energy diversity and security—have necessitated the need for research on the performance and utilization of these fuels and fuel blends in current and future vehicle fleets. One critical research area is related to achieving a full understanding of the impact of biodiesel fuel blends on advanced emission control systems. In addition, the use of biodiesel fuel blends can degrade diesel engine oil performance and impact the oil drain interval requirements.

There is limited information related to the impact of biodiesel fuel blends on oil dilution. This paper assesses the oil dilution impacts on an engine operating in conjunction with a diesel particle filter (DPF), oxides of nitrogen (NOx) storage, a selective catalytic reduction (SCR) emission control system, and a 20% biodiesel (soy-derived) fuel blend. The main focus was on the biodiesel oil dilution levels observed during an accelerated aging protocol and an assessment of the potential impacts on the engine and emissions control systems. For the NOx storage system (which requires a late in-cylinder fuel injection for regeneration), biodiesel oil dilution levels ranged from 5%–10%. For the SCR system (which used a urea solution as a reductant and late in-cylinder fuel injection for diesel particle filter regeneration), biodiesel oil dilution ranged from <4%–8%. These observations were made over typical oil drain intervals. Despite these observed biodiesel oil dilution levels, there were no observed impacts on performance of the engine or the emission control systems.


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03-03-2011, 03:10 PM

.ppt   Oil dilution in diesel engine.ppt (Size: 2.84 MB / Downloads: 133)
Oil dilution in diesel engine

Presence of raw fuel in an engine oil is called as fuel oil dilution.
Excess of 3% is considered abnormal.
Engine oil:
 Lubrication
 Reduce friction
 Dissipate heat energy
Causes of fuel dilution
 Leaking injectors
 Excessive idle time
 Incomplete combustion
 Cool operating condition
 Frequent short trip
 Engine modification
Causes of fuel dilution
 Bad A/F ratio
 Blow by
 Incorrect choke setting
 Overloading of engine
 Over fueling
 Loose seals and gaskets
 Improper injector timing
 Post injection
Effects of fuel dilution
 Waxing-low pressure and starvation
 Loss of base no
 Reduce viscosity
 Increased oil consumption
 Dilute oil additive
 Crankcase accumulation
 More wear ant tear
Effects of fuel dilution
 Soot formation
 considered normal up to certain level
 forms due reduce combustion efficiency
 new emission norms and EGR amplify soot
 polishes of protective antiwear soap
 deposition of soot reduce engine reliability
Impact of biodiesel blend
 Pathway to energy diversity
 Derived from vegetable oil,animal fat,waste cooking oil,JATROPHA oil
 Contains methyl esters of fatty acid
 Reduces petroleum dependence
 Can reduce up to 5% in next one decade
 Compatible with vehicle components
 Accelerate oil dilution problem
Impact of biodiesel
It cause oil dilution due to
 Higher distillation temperature
 Higher boiling temperature
Acid formation due to breaking of fatty acid causes corrosion.
• Detection of oil dilution
 Flash point testing
 Gas chromatography-injection,separation,detection
 Vi smart viscosity sensor
 FTIR-fourier transform infrared
identify the spectral fingerprint of oil
 D-lube
• D lube
• Engine oil is circulated continuously into a measuring chamber
• Oil dilution is detected by monitoring gamma ray signal
• View of the test bed
Advantage of D-lube

 Real time measurement
 Short test duration
 High sensitivity
 No change in oil properties
 Equipment is easy to install
 Applicable on test rigs and on vehicle
• Importance of oil dilution analysis
 Life of engine
 Cost of maintenance
 Emission problem
 Fuel economy
In line post injection

• DFT 1500 hammerdown
-prevent carbon deposits around injector orifice.
-act as a surfactant,breaks down fuel into 2 microns.
• No oil additive to control
• Proactive maintenance
• Oil analysis
• Research paper by Lakshmi Narasimhan,Edited & published by Lamar Stonecypher on May 19, 2010.
• Research paper from sensor engine technology 2007.
• Conference paper August 2009 at SAE International meeting,Florence,Italy.
• Research paper by oil company AMSOIL
• Technical brochure 2004 by delta service industries.

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