scholarly journals Effect of Zinc Dialkyl Dithiophosphate Replenishment on Tribological Performance of Heavy-Duty Diesel Engine Oil

2021 ◽  
Author(s):  
Alaaeddin Al Sheikh Omar ◽  
F. Motamen Salehi ◽  
U. Farooq ◽  
A. Neville ◽  
A. Morina
Keyword(s):  
Tribological Performance ◽  
Engine Oil ◽  
Additive Concentration ◽  
Heavy Duty ◽  
Zinc Dialkyl Dithiophosphate ◽  
Used Oil ◽  
Heavy Duty Diesel Engine ◽  
Oil Performance ◽  
Heavy Duty Diesel ◽  
Dialkyl Dithiophosphate

Abstract Soot is the main contamination that affects oil performance and increases oil drain intervals in heavyduty engine oil. It is also believed that additive concentration in engine oil can be influenced due to additive depletion over time and additive adsorption on soot particles. To extend oil drain intervals and improve oil performance, filter manufactures explore removing the soot to a certain level and replenishing the consumed additives. Zinc Dialkyl Dithiophosphate (ZDDP) is one of the most favoured anti-wear additives that reacts very rapidly with rubbing surfaces to form tribofilm that reduce wear. In this study, the experimental work aims to investigate the effect of ZDDP replenishment on tribological performance in the existence of soot and after removing soot from heavy-duty used oil. The study reveals that reclaiming the used oil can be achieved by removing the soot to a certain level. The results demonstrate that the reclaimed oil after removing soot is still not as good as the fresh oil. This study proves that additive depletion, additive adsorption on soot and the decomposition of antiwear additive adversely influence the reclaimed oil performance. However, replenishing the consumed additive by adding a small amount of ZDDP helps to improve the reclaimed oil performance compared to a large amount of ZDDP which is required to re-gain the oil performance in the existence of soot.

Sooted Diesel Engine Oil Pumpability Studies as the Basis of a New Heavy Duty Diesel Engine Oil Performance Specification

2002 ◽  
Author(s):  
David M. Stehouwer ◽  
Greg Shank ◽  
Steven N. Herzog ◽  
Charles W. Hyndman ◽  
Bernard G. Kinker ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Engine Oil ◽  
Heavy Duty ◽  
Performance Specification ◽  
Heavy Duty Diesel Engine ◽  
Oil Performance ◽  
Heavy Duty Diesel

Adaptability of piston skirt coatings on the tribological performance of heavy-duty diesel engine under low viscosity lubricant

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Bifeng Yin ◽  
Xuefeng Wang ◽  
Bo Xu ◽  
Gongyin Huang ◽  
Xin Kuang
Keyword(s):  
Friction Coefficient ◽  
Tribological Performance ◽  
Heavy Duty ◽  
Coating Materials ◽  
Content Type ◽  
Piston Skirt ◽  
Low Viscosity ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel ◽  
Piston Skirts

Purpose The purpose of this paper was to improve the frictional wear resistance properties of piston skirts caused by the low viscosity lubricant by studying the tribological performance of three novel coating materials. Design/methodology/approach Comparative tribological examinations were performed in a tribological tester using the ring-block arrangement under two viscosity lubricants, the loading force was applied as 100 N, the speed was set to 60 r/min and the testing time was 180 min. Findings Under low viscosity lubricant, the friction coefficient and wear of the three coatings all increase, and the friction coefficient and wear of the PTFE coating are the largest, while the MoS2 coating has the lowest friction coefficient and wear. Under low viscosity lubricant, the friction coefficient of the MoS2 coating is 2.1%–5.4% and 20.0%–24.3% lower than that of the SiO2 and PTFE coating, respectively. The friction coefficient and wear fluctuation rate of the MoS2 coating is the smallest when the lubricant viscosity decreases, which indicates that the MoS2 coating has excellent stability and adaptability under low viscosity lubricant. Originality/value To reduce the piston skirt wear caused by low viscosity lubricant in heavy-duty diesel engines, the friction and wear adaptability of three novel composite coating materials for piston skirts were compared under 0 W-20 low viscosity lubricant, which could provide a guidance for the application of wear-resistant materials for heavy-duty diesel engine piston skirt.

The soot handling ability requirements and how to solve soot related viscosity increases of heavy duty diesel engine oil

2017 ◽  
Vol 69 (5) ◽  
pp. 683-689 ◽  
Author(s):  
Zhongping Tang ◽  
Zhengwen Feng ◽  
Peng Jin ◽  
Xisheng Fu ◽  
Hua Chen
Keyword(s):  
Diesel Engine ◽  
Soot Formation ◽  
Screening Method ◽  
Research Work ◽  
Engine Oil ◽  
Heavy Duty ◽  
Content Type ◽  
Viscosity Increase ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

Purpose The purpose of this paper is to identify the feature of soot in diesel engine oil and provide a method to stably disperse these soots using effect additives which is benefical for lubricants to pass related engine tests. Design/methodology/approach This paper designed experiments to investigate the dispersant type, treat level and different dispersant interactions which influence on lubricant soot-related viscosity increase. The research work developed an effective dispersant package which can well solve the soot-related viscosity increase, allowing pass Mack T-11 and Mack T-8 engine tests and demonstrated the helpfulness of using a quickly screening method developed by a steel piston diesel engine CA 6DL2-35. Findings The effect of dispersant treat level on the viscosity increase of the oil samples was negligible. Dispersant booster can effectively improve the soot handling ability of heavy-duty diesel engine oils (HDDEO), and the appropriate treat level of dispersant booster can help HDDEO pass Mack T-8 and Mack T-11 engine tests. Practical implications The test results are useful for formulators to select the appropriate dispersants or dispersant booster to develop the HDDEO packages which can meet the modern diesel engine lubrication requirements. Originality/value Most previous studies in this field were carried out on soot formation mechanism and soot-related wear rather than how to solve the soot-related viscosity increasing of HDDEO. This paper describes the soot dispersing requirements of different HDDEO specifications and developed an effective dispersant package which can well deal with Mack T-11 and Mack T-8E standard engine tests soot handling ability requirements.

scholarly journals The Evaluation of Lubricants Performances in Light- and Heavy-Duty Diesel Engines in The Application of Biodiesel (B20).

2020 ◽  
Vol 43 (2) ◽  
pp. 81-90
Author(s):  
Hanifuddin Hanifuddin ◽  
Milda Fibria ◽  
Catur Y. Respatiningsih ◽  
Setyo Widodo ◽  
Maymuchar Maymuchar
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Engine Oil ◽  
Heavy Duty ◽  
Used Engine Oil ◽  
The Road ◽  
Initial Values ◽  
Light Duty ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

The use of biodiesel as fuel in light- and heavy-diesel engine vehicles in general will negatively affects the lubricant performance. the changes in lubricants properties during the use of B20 were investigated. Two type of vehicles engines were used, namely heavy duty and light duty diesel engines. The road test wascarried out until 40,000 km, while the lubricant was drained and analysed only for 10,000 km of distances. The laboratory test was conducted to observe both fresh and used lubricants. The results show that the biodiesel dilutions were less than 2% both in light- and heavy-duty diesel engines. The kinematic viscositiesof 4 samples of used lubricants in light-duty diesel engine were decreased in the ranges of 0.58 – 7.5%, while in heavy-duty diesel engines were 4.66-16.04% from the initial values. The decreasing of TBNs were less than 14% in light-duty diesel engine and fewer than 16% in heavy-duty diesel engine fuelled by biodiesel (B20). Meanwhile, the acidity of used engine oil was increased until 173% for light-duty diesel engine and 63% heavy-duty diesel engine compare to the initial values. The results show that the metal additives decreased while wear metal increased. According to this study, the increasing of wear metal (copper) in the used lubricants were less than 23% in light-duty diesel engine and lower than 26% in heavy-duty diesel engine fuelled by biodiesel (B20). Meanwhile, the lead contents of used engine oil were increased to 3.2 ppm in heavy-duty diesel engine and was not detected in light-duty diesel engine. After all, this work found that the lubricants exhibit good performances in the light- and heavy-duty diesel engines fuelled by B20. The changes of some critical properties were still in the acceptable values regarding to the specification as required in the SNI-7069-5 (2021).

Development of Fuel Economy Engine Oil for Heavy Duty Diesel Engine

2015 ◽  
Author(s):  
Yoichiro Nakamura ◽  
Kenji Tomizawa ◽  
Takahiro Onishi ◽  
Takashi Hashimoto ◽  
Motoshige Sato ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Engine Oil ◽  
Heavy Duty ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel
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