Kamis, 20 Agustus 2009

KURAS REM

Kuras Minyak Rem atau bleeding hal yang harus dilakukan secara rutin untuk menjaga kinerja rem tetap maksimal. Hal perlu dilakukan dengan tujuan untuk membuang kandungan uap air pada minyak rem dan saluran pada sistem kinerja rem. Uap air muncul akibat panas yang ditimbulkan oleh pengereman yang terus-menerus pada saat kendaraan melaju dan oleh cuaca. Juga untuk membuang kandungan udara pada sistem penyaluran minyak rem.

Periode pengurasan minyak rem dapat dilakukan maksimal 20.000 km atau dengan asumsi kendaraan berjalan secara rutin maupun didiamkan dalam garasi. Dan bila sering melakukan pengereman secara berkepanjangan maka pengurasan akan lebih sering. Ini berlaku untuk minyak rem type DOT-3, apabila memakai DOT-4 akan lebih lama lagi umurnya.

Selasa, 18 Agustus 2009

REM BUNYI : DISC BRAKE type

Rem Bunyi bisa disebabkan oleh adanya ketidak beresan pada tiga komponen yaitu Brake Pad (kampas), Rotor (piringan rem) dan Caliper.

Brake Pad atau kampas dengan bahan yang keras biasanya cenderung akan menimbulkan bunyi, maka kadang dengan Brake Pad Original timbul bunyi. Sedang kampas berbahan lebih lunak akan meminimkan tibulnya bunyi, namun kampas pasti akan lebih boros. Kampas dengan bahan SEMI METALIC termasuk yang lebih sering "menjerit" apalagi didukung kondisi jalanan yang banyak debu dan lembab.

Rotor Disc Brake yang sudah kurang bagus sisi-sisi permukaannya juga menjadi penyubang suara aneh pada bagian rem. Maka bila masih memungkinkan permukaan Rotor atau piringan rem dihaluskan lagi. Apabila sudah diluar toleransi ketebalannya, ya harus diganti.

Nah yang paling susah dilihat untuk memastikan adalah rem bunyi akibat CALIPER kotor. Bisa di pistonnya atau pada pin-nya yang berkarat. Maka diperlukan mekanik untuk menganalisa dan membongkarnya agar bisa diperbaiki.

What type of motor oil is best for my engine?

The type specified by the vehicle manufacturer in your owner's manual. For most passenger car and light truck gasoline engines today, it's any oil that meets the American Petroleum Institutes "SH" rating.

As for the viscosity of oil to use, most new engines today require a multiviscosity 5W-30 oil for all-round driving. The lighter 5W-30 oils contain friction reducing additives that help improve fuel economy, and also allow the oil to quickly reach critical upper valvetrain components when a cold engine is first started. Most engine wear occurs immediately after a cold start, so it's important to have oil that is thin enough to circulate easily -- especially at cold temperatures.

For older engines and ones that are driven at sustained highways speeds during hot weather, 10W-30 or 10W-40 is a good choice. Heavier multiviscosity oils such as 20W-40 are for high rpm, high-load applications primarily and are not recommended for cold weather driving.

Straight weight 30W and 40W oils aren't very popular anymore, but some diehards insist on using them. They say the thicker oil holds up better under high temperature (which it does), increases oil pressure and reduces oil consumption in high mileage engines. But straight 30W and 40W oils are too thick for cold weather and may make an engine hard to start. They may also be too thick to provide adequate start-up lubrication to critical upper valvetrain components during cold weather. So switching to a straight 20W oil would be necessary for cold weather driving. Straight 10W oil can also improve cold starting, but is very thin and should only be used in sub-zero climates. A multiviscosity 10W-30 or 10W-40 will provide the same cold starting benefits of a 10W oil and the high temperature protection of a 30W or 40W oil.

For the ultimate in high temperature protection, durability and all-round performance, synthetic oils are the way to go. Unfortunately, most synthetic oils cost up to three times as much as ordinary petroleum-based oils. They cost more because synthetics are manmade rather than refined from petroleum. But this improves their performance in virtually every aspect:

  • Superior temperature resistance. Synthetics can safely handle higher operating temperatures without oxidizing (burning) or breaking down. The upper limit for most mineral based oils is about 250 to 300 degrees F. Synthetics can take up to 450 degrees F. or higher. This makes synthetics well-suited for turbo applications as well as high rpm and high output engine applications.
  • Better low temperature performance. Synthetics flow freely at subzero temperatures, pouring easily at -40 or -50 degrees F. where ordinary oils turn to molasses. This makes for easier cold starts and provides faster upper valvetrain lubrication during the first critical moments when most engine wear occurs.
  • Better engine performance. Synthetics tend to be more slippery than their petroleum-based counterparts, which improves fuel economy, cuts frictional horsepower losses and helps the engine run cooler. The difference isn't great, but it can make a noticeable difference.
  • Longer oil change intervals. Because synthetics resist oxidation and viscosity breakdown better than ordinary motor oils, some suppliers say oil change intervals can be safely extended -- in some cases stretched to as much as 25,000 miles. Such claims are justified by the fact that synthetics don't break down or sludge up as fast as ordinary mineral-based oils do in use.

    CAUTION: For vehicles under warranty, extending the normal change interval is not recommended because failing to follow the OEM's maintenance schedule can void your warranty.

    Synthetics are available in the same grades as ordinary motor oils (5W-30, 5W-20 and 10W-30) as well as "extended" grades such as 15W-50 and even 5W-50.

    There are also lower-cost synthetic "blends" that combine synthetic and petroleum-based oils in the same container. But you can do your own blend to save money by simply substituting a quart or two of synthetic oil for conventional oil when you change oil. Synthetics are compatible with conventional motor oils.

    Who should use a synthetic oil? The premium-priced oil is best for:

    • Turbocharged or supercharged engines
    • Performance or high output engines
    • Vehicles used for towing (especially during hot weather)
    • Vehicles that are operated in extremely cold or hot climates
    • Anyone who wants the ultimate in lubrication and protection

LAHIRAN

Ayo ngeblog soal mobilmu disini....kita sharing yuuuuuuuuk