Thursday, September 29, 2011
Proton Perdana V6 which come with Mitsubishi 6A12 engine, sometime have some controversial issue on their maintenance side, and for this 6A12 cylinder head gasket, the price tag for Japan item is far more expensive than those made in Taiwan or China, hence the owner may tend to buy the cheap item when come to this parts.
Now, just see what make the difference between Japan parts with other, beside the more higher grade of graphite material, please take a look at the 4 holes that have the blue O-ring seal on it.
And let's take a look on the 6A12 V6 engine configuration, unlike some of the engine which the 2 cylinder head is making a "V" shape on the engine bay, the Proton Perdana V6 is a bit difference, one of the engine cylinder head is staying flat like those normal engine, and another block is 45 degree sideway.
So, some say that for the flat side of engine cylinder head, it can use any cylinder head gasket, but the side that is 45 degree away, due to the pressure on the 4 holes with blue O-ring, only the Japan item part can sustain that working pressure, others may start to show sign of leaking after 3 weeks of installation.
Monday, September 26, 2011
This gasket is not appear on the engine side, it is located in the gear box area which foreman may call it as valve body.
The original material of this gasket is thin metal sheet, normally this item is not service as a single part, which its repair kit will come with other o-ring and seal.
But it seem this item may damage more frequent than the other seal, which they may demand for this gasket only when carry out repair.
Forget to mention the photo item is for Proton Waja.
Tuesday, September 20, 2011
Isuzu ELF truck which come with 4Hseries of engine first start with engine code of 4HF1, which it have NPR, NKR and NKS model.
The first generation of 4HF1 engine rocker cover design as it have 15 screw holes on it, and than it come to 2nd generation of 4HF1, or may be it is call 4HG1, have the same number of 15 screw holes on the rocker cover but the gasket is design as such it looks thinner than the first generation.
And it come to 3rd generation of 4HG1, the gasket is about the same thickness with the first generation but it only have 8 screw holes.
It is quite confusing after this when the 4HK1 is start to rolling on the road, the rocker cover gasket have an another design with 10 screw holes and all of sudden they design the another type of rocker cover gasket with no screw holes at all.
Beside the rocker cover gasket, you may facing the difference of oil pan gasket, valve seal and oil cooler gasket from the difference generation of Isuzu 4Hseries of engine.
Friday, September 16, 2011
Since nowaday more and more Kancil turbo owner is getting various halfcut on many sources, sometime it is quite confusing for some owner when sourcing for their parts, let see what you can expect on the various rocker cover gasket when you have modified a Kancil turbo engine.
In this introduction, I'm exclude the normal Kancil rocker cover which is interchangeable with L2 turbo, and also Kelisa, Myvi and Viva rocker cover which is normal local model.
The photo above show the most popular Kancil turbo after the L2, which is call L5 turbo among the group, which engine code is JB-JL and JB-EL, in Japan it found in Daihatsu Mira and Opti.
The above photo show the rocker cover gasket which they like to call it L7 turbo, some call it L5 3 cylinders which I'm not really agree on this naming. The design is more like those rocker cover gasket in Kelisa and Kenari, but it is not interchangeable.
The main engine code for this rocker cover is EF-GL, EF-RL, EF-ZL and EF-ZS, which in Japan can be found on Mira, Opti, Move, Hijet and Atrai.
The above photo show Kancil L9 turbo rocker cover gasket, which it is similar with the Kancil L5 type but without the curve on oe of the side of this gasket.
The JB-DET engine can be found on Daihatsu Copen, Move and Max.
The above rocker cover gasket is rarely found in our market, it is 3 cylinder type of engine and actually I'm not really know that I should call it L --> number what??? And I'm suspecting this engine may not come with those Turbo as well.
The EF-SE engine can be found on Daiahtsu Mira, Opti, Move, Hijet and Atrai.
This rocker cover gasket can be consider is in the same family with those L5 and L9, the engine code of JB-DET and JC-DET rocker cover have a very similar design, if you watch carefully, the rocker cover gasket don't have the "screw hole" like those on the L5 and L9 rocker cover gasket.
Mitsubishi Galant RVR 2.4 DOHC with 4G64 engine which include model like EA3A, EC3A, N74WG and N64WG.
But it seem there are one type of Grandis in Malaysia is using this type of engine, though Grandis model code is N84W and N94W for the model from year 2000 onwards, the RVR 2.4 type of engine is already in the market from year 1998 onwards.
Wednesday, September 7, 2011
How does the oxygen sensor in a car work?
The amount of oxygen the engine can pull in depends on factors such as the altitude and the temperature of the air and engine. See more pictures of engines.
Every new car, and most cars produced after 1980, have an oxygen sensor. The sensor is part of the emissions control system and feeds data to the engine management computer. The goal of the sensor is to help the engine run as efficiently as possible and also to produce as few emissions as possible.
A gasoline engine burns gasoline in the presence of oxygen (see How Car Engines Work for complete details). It turns out that there is a particular ratio of air and gasoline that is "perfect," and that ratio is 14.7:1 (different fuels have different perfect ratios -- the ratio depends on the amount of hydrogen and carbon found in a given amount of fuel). If there is less air than this perfect ratio, then there will be fuel left over after combustion. This is called a rich mixture. Rich mixtures are bad because the unburned fuel creates pollution. If there is more air than this perfect ratio, then there is excess oxygen. This is called a lean mixture. A lean mixture tends to produce more nitrogen-oxide pollutants, and, in some cases, it can cause poor performance and even engine damage.
The oxygen sensor is positioned in the exhaust pipe and can detect rich and lean mixtures. The mechanism in most sensors involves a chemical reaction that generates a voltage (see the patents below for details). The engine's computer looks at the voltage to determine if the mixture is rich or lean, and adjusts the amount of fuel entering the engine accordingly.
The reason why the engine needs the oxygen sensor is because the amount of oxygen that the engine can pull in depends on all sorts of things, such as the altitude, the temperature of the air, the temperature of the engine, the barometric pressure, the load on the engine, etc.
When the oxygen sensor fails, the computer can no longer sense the air/fuel ratio, so it ends up guessing. Your car performs poorly and uses more fuel than it needs to.
Source : http://www.howstuffworks.com/question257.htm
And below article may seem like a bit of advertising, anyway, just an additional info.
The Delphi Wide Range Oxygen Sensor is an integral component in a gasoline or diesel engine management system, helping provide accurate engine control and system diagnostics. It measures the air⁄fuel ratio of exhaust gases over a wide lambda range. Its five-wire, two-cell design enables higher signal resolution with greater accuracy. An integrated heater and alumina⁄zirconia element facilitate a fast light-off, allowing earlier closed-loop operation compared to conventional conical oxygen sensors.
•High signal resolution and low pressure sensitivity help provide precise engine control
•Integral heater enables faster light-off for earlier closed-loop operation
•Unique planar element design enhances thermal shock resistance
•Fast response helps improve fuel economy
•Industry-leading poison-resistant coating helps achieve better durability and truer reading of exhaust gases
Note: The Delphi Wide Range Oxygen Sensor characteristic output is linear to percent oxygen in the exhaust. The output curve can be made linear to lambda (A⁄F) if desired.
Source : http://delphi.com/manufacturers/auto/sensors/engine-and-transmission/diesel-and-gasoline/wide-range-oxygen/