automedics (1)

Purposes of using the right automobile engine oil

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Posted on February 12, 2018

 

Lubricating oil is often called the blood of an engine. Proper lubrication of all moving parts is essential for the operation of an internal combustion engine.

The lubrication primarily decreases the power required to overcome friction and reduces wear between the rubbings and bearing surfaces, thereby increasing the power output and the engine service life, and avoids seizure and serious damage of the components. Additionally, the lubricant acts as a coolant, carrying heat away from the bearings, cylinders and pistons. The lubricating film on the cylinder wall acts as a seal to prevent the gases of combustion from blowing by the piston rings and entering the crankcase. Thus, the effectiveness of engine lubrication plays an important role in determining the service life and the performance characteristics of an engine.

The lubrication system is consisted of oil pan, oil pump, oil filter, and oil passages. The passages or inner channels through which oil, like blood in the human veins, get to the nooks and crannies of an engine are largely now finely or very thinly cut in modern engines. Hence, the reason why engine manufacturers of modern automobiles, say, from 15 years to date, usually now state categorically that finely blended, less viscous engine oil classifications like SAE 0-W-20, SAE 5-W-20, SAE 5-W-30, etc. are used to maintain their engines. It’s vitally essential that you make sure that in maintaining your engine, the right classifications of engine oil as instructed by your engine manufacturers are used compulsorily; that’s the only way to make the engine last and serve you well!

The following are the purposes of the right (I repeat: right) specification of lubricating oil in an automobile engine:

Lubrication – An important purpose of engine oil is to lubricate engine parts so that friction and wear are reduced. Lubrication between two moving surfaces results from oil film that builds up to separate the surface and support the load. The lubrication system must provide a continuous flow of oil to all the engine bearings and other lubricated surfaces so that the oil film on each component is maintained to minimise wear. The correct oil viscosity is also essential for reducing friction.

Cooling – The lubricating oil carries heat away from the component which is lubricated. The oil is returned to the oil pan. Some engines incorporate external oil coolers to assist in oil cooling in the oil pan. It is necessary to keep the oil temperature below the flash point of the oil. An engine oil must also have a high heat resistance so that carbon formation due to breakdown is kept to a minimum.

Cleaning or detergence effect – The engine oil has an ability to clean all the engine components, which are in contact with it. Additives in the engine oil help the oil to perform its cleaning operation. Carbon formation is cleaned from the pistons and rings by engine oil. Also, other engine components, such as valve stems, valve lifters, rocker arms, and camshafts, are also cleaned.

Sealing – The engine oil helps the piston rings to form a tight seal between the rings and cylinder walls. Microscopic irregularities in the piston rings or cylinder walls are filled by the oil film, preventing the escape of combustion chamber gases. The engine oil clings to the metal surfaces and resists the tendency of combustion chamber gases to “blow by” the piston rings. The oil film also provides lubrication between the rings and the piston ring grooves, thus allowing the rings to move freely and therefore to have continuous contact between the rings and cylinder walls. Oil between the engine parts cushions the parts from the shock as the combustion charge forces the piston down.

With the additives, the oil has ability to minimise scuffing, reduce rusting, resist oxidation, and maintain the oil’s viscosity characteristics. If the oil is too thin, it rapidly leaks from the clearances, thus allowing the parts to come in contact, resulting in scoring of the parts. When the thickness is too large, the oil requires excessive power to overcome drag between the rubbing surfaces.

The sad truth in Nigeria today is that many of the big brands (I don’t want to name names) selling engine oil don’t sell the right specification for contemporary vehicles on our roads. Please don’t take my word for it; just do this simple investigation on your own: either look atop your engine’s oil chamber or compartment cap under your hood/bonnet, or in your vehicle’s owner’s manual in the chapter on lubrication or lube service/engine maintenance, then reconcile the exact engine oil specification (say, SAE 0-W-20, SAE 5-W-20, SAE 5-W-30, SAE 5-W-40, etc.) with the grading or specification that’s stated on the container of the engine oil that’s used in servicing your vehicle. If it’s not exactly the same, especially the numbers after the “W”, then, as one young technician in one of my workshops often says: “You dey kill your engine fast fast!”

I know it’s often pretty difficult to get the right spec of engine oil and very good oil additive/s that’ll help reduce friction and wear in engine’s, especially for new automobiles in Nigeria, but these numbers 08023025022/ 08073038173 by AUTOMEDICS are dedicated to help you get the right types of lubricants and outstanding additives as mandated by your engine manufacturer.

NB: Parts of this piece is culled from the internet.

Feedback

I have problem with the (shock) absorbers on my 2007 Hyundai. All my efforts to secure the parts here have been abortive. Please sir, can you advise me on where I could get one bought thanks? —W.A. Abolarin

We can order the parts for you if you can furnish us with the model and VIN number of your vehicle.

I use a limited edition 2008 Toyota Highlander. Recently, my AC technician advised that I have to change my compressor, condenser, and evaporator when the AC was experiencing incessant breakdown. He changed all those eventually.

Since all these parts were replaced, heat has been coming into the car through the AC vents when the AC is not used at all. I have taken the car back, but he seems not to have got the system. Another technician has also checked and confirmed that every vent is properly closed and that the vent bottom is always engaged.

Kindly educate me on what may probably be the problem. The technician is advising that he has to block the thermostat. Kindly advise me. Kind regards. —Damilola

I want to believe the fault is around the A/C evaporator. When the part was replaced, I believe the heater core vent was left open, so the heat from the core is what is escaping into the cabin of the vehicle. The A/C technician needs to go over his job again; most especially, he needs to pay attention to the heater valve and vents.

Diagnostic codes

P0403 – Exhaust Gas Recirculation Circuit Malfunction

Early Exhaust Gas Recirculation (EGR) systems components include EGR Valve and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid, which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve.

The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned on and off in sequence. Each time an on pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.

The code is detected when an improper voltage signal is sent to ECM through the valve.

Possible symptoms: Engine Light on (or Service Engine Soon Warning Light), possible engine hesitation.

Possible causes: Faulty EGR volume control solenoid valve, EGR volume control solenoid valve harness is open or shorted, EGR volume control solenoid valve circuit poor electrical connection, EGR temperature sensor and circuit.

P0404 – Exhaust Gas Recirculation Circuit Range/Performance

Early EGR systems components include EGR Valve and ECΜ Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve.

The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from the exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned on and off in sequence. Each time an on pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.

The code is detected when an improper voltage signal is sent to ECM through the valve.

Possible symptoms: Engine Light on (or Service Engine Soon Warning Light), engine hesitation.

Possible causes: Faulty EGR volume control solenoid valve, EGR volume control solenoid valve harness is open or shorted, EGR volume control solenoid valve circuit poor electrical connection, EGR temperature sensor and circuit.

P0405 – Exhaust Gas Recirculation Sensor ‘A’ Circuit Low

Early EGR systems components include EGR Valve and ECΜ Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve.

The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from the exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned on and off in sequence. Each time an on pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.

The code is detected when an improper voltage signal is sent to ECM through the valve.

Possible symptoms: Engine Light on (or Service Engine Soon Warning Light), engine hesitation.

Possible causes: Faulty EGR volume control solenoid valve, carbon built up on EGR valve, EGR volume control solenoid valve harness is open or shorted, EGR volume control solenoid valve circuit poor electrical connection, faulty EGR temperature sensor and circuit.

Source: http://punchng.com/purposes-of-using-the-right-automobile-engine-oil/


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