scholarly journals Analisis Kerusakan Engine High Blow-By Pressure Pada Mesin SA6D125E-2 UNIT bulldozer D85ESS-2A

2021 ◽  
Vol 2 (2) ◽  
pp. 17
Author(s):  
Damar Jati Sribantolo ◽  
Bambang Suharnadi
Keyword(s):  
Piston Ring ◽  
Engine Speed ◽  
Cylinder Liner ◽  
Technical Analysis

Bulldozer merupakan alat berat yang digunakan untuk mendorong material dan untuk pembukaan jalan. Dalam melakukan pekerjaannya, bulldozer banyak menggunakan tenaga mesin sehingga sering terjadi kerusakan pada komponen mesinnya. Kerusakan high blow-by pressure pada mesin bulldozer merupakan hal yang perlu diperhatikan karena dapat menyebabkan kerusakan pada komponen di dalam mesin dan mengakibatkan menurunnya performa mesin. Penelitian ini dilakukan dengan mengidentifikasi data pada technical analysis report, program analisis pelumas, dan hasil overhaul. Technical analysis report dilakukan dengan cara mengukur blow-by pressure dan engine speed untuk mengetahui performa engine. Program analisis pelumas dilakukan dengan mengambil sampel oli pelumas lalu dianalisis di laboratorium untuk mengetahui keausan dan kontaminan pada oli pelumas engine. Dari hasil penelitian, dapat ditarik kesimpulan bahwa penyebab dari kerusakan high blow-by pressure adalah masuknya kontaminan berupa debu kedalam ruang bakar dan menyebabkan gesekan abnormal pada piston, piston ring, dan cylinder liner. Gesekan abnormal ini mengakibatkan celah antara piston, piston ring, dan cylinder liner semakin besar sehingga tekanan hasil pembakaran bocor menuju crankcase melewati celah tersebut. Dampak yang ditimbulkan dari kerusakan high blow-by pressure adalah penurunan tenaga mesin, sehingga unit bulldozer harus dilakukan perbaikan dengan mengganti komponen yang rusak agar unit dapat bekerja dengan optimal.

Crank-Angle Resolved Oilfilm Thickness Measurement Between Piston Ring and Cylinder Liner in a Spark Ignition Engine

2003 ◽  
Author(s):  
Hans-Joachim Weimar ◽  
Ulrich Spicher
Keyword(s):  
Piston Ring ◽  
Engine Speed ◽  
Combustion Engine ◽  
Cylinder Liner ◽  
Spark Ignition Engine ◽  
Measuring System ◽  
Measuring Technique ◽  
Coolant Temperature ◽  
Optical Probes ◽  
Crank Angle

A new measuring technique has been developed in order to determine the oilfilm thickness between piston ring and cylinder liner in a combustion engine by use of laser-induced fluorescence (LIF) technique. In clear contrast to further investigations, where optical probes have been mounted at a fix position in the cylinder liner allowing single measurements at defined times of the piston stroke, only, the optical probes used in the presented work are mounted in the piston and the piston ring. Fiber optics, led via a grasshopper-link, carry the exciting laser radiation (λ = 488 nm) to the probes and backwards the fluorescence radiation (λ ∼ 540 nm) to a photomultiplier. Thus, the developed measuring system allows a continous, crank-angle resolved measuring of the oilfilm thickness. As the LIF-technique is a relative measuring technique, calibration work, especially in the combustion engine, had to be done. Using eddy current sensors at a fix position in the cylinder liner the oilfilm in a single point could be determined. Grooves of defined depth in the cylinder liner provided the fluorescence signal amplification in each stroke so that adverse influences of oil pollution or temperature could be eliminated. A method has been developed to eliminate transmission influences contributed to the grasshopper link system. The measuring technique adapted to a single-cylinder SI engine has been tested under motored and fired conditions. Parameters under motored conditions were engine speed, oil- and coolant-temperature and throttle position. Experiments under fired conditions (part load) have been done varying oil and coolant temperature. Correlations between oilfilm thickness and HC-emissions under motored conditions have been found. Incylinder pressure, oil-temperature and engine speed are the most influencing parameters.

A Spectrographic Sampling Method for Quick Assessment of Cylinder and Piston Ring Wear

1968 ◽  
Vol 90 (1) ◽  
pp. 43-48
Author(s):  
H. U. Wisniowski ◽  
D. R. Jackson
Keyword(s):  
Rapid Method ◽  
Sampling Method ◽  
Piston Ring ◽  
Cylinder Liner ◽  
Small Sample ◽  
Operating Conditions ◽  
Small Hole ◽  
Cylinder Wall ◽  
Lubricating Oils ◽  
Wear Rates

A simple, inexpensive, and rapid method of assessing cylinder and piston ring wear was developed. A small sample of the oil which lubricates the cylinder wall and piston rings was drawn off through a small hole in the cylinder wall. The sample was then analyzed spectrographically. Changes in wear resulting from changes in cylinder liner materials, fuels, lubricating oils, and other operating conditions were investigated. The method was found useful especially in cases of drastic differences in the wear rates. Selected examples of these studies are reported.

Transient Heat Transfer Simulation of the Coupling 3-D Moving Piston Assembly-Lubricant Film-Liner System

2006 ◽  
Author(s):  
Liu Zhien ◽  
Jiang Yankun ◽  
Chen Guohua ◽  
Yang Wanli
Keyword(s):  
Heat Transfer ◽  
Piston Ring ◽  
Cylinder Liner ◽  
Heat Transfer Model ◽  
Lubricant Film ◽  
Transient Heat Transfer ◽  
Transfer Model ◽  
Friction Heat ◽  
Liner System ◽  
Piston Assembly

Transient heat transfer model of the coupling 3-D moving piston assembly-lubricant film-liner system is successfully developed for predicting the temperature distributions in the component system of internal combustion chamber, in which the effect of the friction heat generated at the piston ring/cylinder liner interfaces has been taken into account. The finite element method (FEM) is employed in the model for establishing the heat transfer relation among the moving piston assembly-lubricant film-cylinder liner. The 3-D discrete model of the coupling system is obtained by hypothesizing the lubricant film as 1-D thermal resistances and the friction heat as heat flux boundary conditions. The allocation and distribution model of friction heat on piston ring pack and liner are also established. The 3-D coupling heat transfer model has been used to analyze the heat transfer of a gasoline engine.

An experimental investigation into the wear of the cylinder liner-piston ring in engines

Tribotest ◽  
1996 ◽  
Vol 2 (3) ◽  
pp. 281-288 ◽  
Author(s):  
Zhang Yingcai ◽  
Lu Yun ◽  
Zhang Houjun
Keyword(s):  
Experimental Investigation ◽  
Piston Ring ◽  
Cylinder Liner

Mutual influence of plateau roughness and groove texture of honed surface on frictional performance of piston ring–liner system

2016 ◽  
Vol 231 (7) ◽  
pp. 838-859 ◽  
Author(s):  
Yang Hu ◽  
Xianghui Meng ◽  
Youbai Xie ◽  
Jiazheng Fan
Keyword(s):  
Piston Ring ◽  
Cylinder Liner ◽  
Texture Features ◽  
Groove Depth ◽  
Mixed Lubrication ◽  
Operating Conditions ◽  
Friction Reduction ◽  
Lubrication Performance ◽  
Liner System ◽  
Frictional Performance

The cylinder liner surface finish, which is commonly produced using the honing technique, is an essential factor of engine performance. The characteristics of the texture features, including the cross-hatch angle, the plateau roughness and the groove depth, significantly affect the performance of the ring pack–cylinder liner system. However, due to the influence of the honed texture features, the surface roughness of the liner is not subject to Gaussian distribution. To simulate the mixed lubrication performance of the ring–liner system with non-Gaussian roughness, the combination of a two-scale homogenization technique and a deterministic asperities contact method is adopted. In this study, a one-dimensional homogenized mixed lubrication model is established to study the influence of groove parameters on the load-carrying capacity and the frictional performance of the piston ring–liner system. The ring profile, plateau roughness, and operating conditions are taken into consideration. The main findings are that for nonflat ring, shallow and wide groove textures are beneficial for friction reduction, and there exists an optimum groove density that makes the friction minimum; for flat ring, wide and sparse grooves help improving the tribological performance, and there exists an optimum groove depth that makes the friction minimum.

scholarly journals Wear of different material pairings for the cylinder liner – piston ring contact

2018 ◽  
Vol 70 (4) ◽  
pp. 687-699 ◽  
Author(s):  
Thomas Wopelka ◽  
Ulrike Cihak-Bayr ◽  
Claudia Lenauer ◽  
Ferenc Ditrói ◽  
Sándor Takács ◽  
...  
Keyword(s):  
Steady State ◽  
Wear Mechanisms ◽  
Piston Ring ◽  
Cylinder Liner ◽  
Wear Behaviour ◽  
Special Focus ◽  
Intermediate Step ◽  
Piston Rings ◽  
Content Type ◽  
Cylinder Liners

Purpose This paper aims to investigate the wear behaviour of different materials for cylinder liners and piston rings in a linear reciprocating tribometer with special focus on the wear of the cylinder liner in the boundary lubrication regime. Design/methodology/approach Conventional nitrided steel, as well as diamond-like carbon and chromium nitride-coated piston rings, were tested against cast iron, AlSi and Fe-coated AlSi cylinder liners. The experiments were carried out with samples produced from original engine parts to have the original surface topography available. Radioactive tracer isotopes were used to measure cylinder liner wear continuously, enabling separation of running-in and steady-state wear. Findings A ranking of the material pairings with respect to wear behaviour of the cylinder liner was found. Post-test inspection of the cylinder samples by scanning electron microscopy (SEM) revealed differences in the wear mechanisms for the different material combinations. The results show that the running-in and steady-state wear of the liners can be reduced by choosing the appropriate material for the piston ring. Originality/value The use of original engine parts in a closely controlled tribometer environment under realistic loading conditions, in conjunction with continuous and highly sensitive wear measurement methods and a detailed SEM analysis of the wear mechanisms, forms an intermediate step between engine testing and laboratory environment testing.

Sign in / Sign up

Export Citation Format

Share Document