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FAQ

WHY A GOOD QUALITY TORQUE WRENCH ?

 

Torque tools give you all the options you need to tighten just about any fastener. There is a huge selection of torque wrenches including torque screwdrivers . These tools are highly regarded where it counts – in the factories and mechanical shops. Accuracy in the tightening of fasteners is critical, especially on today’s high tech machinery and equipment where precision can be affected by even the slightest variance. Over-tightening can ruin head gaskets,carbon and aluminum components, brake rotors and transmission valve bodies. It’s important to follow the manufacturer’s manual regarding proper force, torque pattern, and torque “tighten/release” cycles. NEVER go beyond the specified working range of the wrench. Any measurements outside of the working range are likely to be inaccurate and could result in a dangerous condition. Don’t use handle extensions on any torque wrench in order to gain leverage as this can go beyond the working range and could damage the tool itself. Dropping a torque wrench, whether or not it has electronics on board, can cause the instrument to lose reliable calibration. Torque wrenches should be calibrated at least once a year.

 

Compression and Leak Down Testing

 

A very important piece of information about the internal condition of an engine is a leak down test. This test is very different from a compression test. We will try to explain the differences and the reasons for the tests.

 

Compression Test

 

A compression test is done (obviously) with a compression gauge. This is basically a pressure gauge that has a one-way check valve and an adapter to screw into a spark plug hole. With a good battery and a warm engine, we remove all the spark plugs. The compression tester is screwed in place of one spark plug and while holding the throttle plate open, the engine is cranked over. The engine is allowed to rotate a few times to build up pressure and this pressure is recorded. Each of the cylinders are checked in the same way.

In our opinion, all cylinders should be within 4% of each other. If you have a cylinder that has excessively low compression, try adding a few drops of oil. If the compression comes up, you have a ring seating problem. If it does not, you have a valve or head gasket problem, or some other problem.

 

Leak Down Test

 

A leak down test is more specific in pinpointing the condition of an engine and if there are problems, it can pinpoint the needed area of attention. A leak down test is performed with a special gauge and manifold set. It consists of a calibrated pressure gauge and a pressure regulator and adapters to connect it to the spark plug hole. Compressed air (or nitrogen) is fed into the gauge and the gauge is calibrated against a zero reference (no air leakage). The adapter is then screwed into the number one spark plug hole (with cylinder #1 at TDC compression) and the gauge is attached. As soon as the gauge is attached to the adapter air will begin to fill the cylinder. As this happens, the gauge will begin to indicate the amount of air flowing into the cylinder. If air is leaking past the rings, or the valves, or the head gasket, we can directly read the amount of leakage and can easily find the leak. If there is air blowing out the PCV, we have a ring leak, if it’s coming out of the exhaust, we have an exhaust valve leak

A leak down test is especially good at discovering leaky valves. We use much less pressure (about 80 psi) than is normally in the combustion chamber (several hundred psi). If there is a valve that is slightly off its seat, the actual combustion pressure may have helped close it, but the lower testing pressure won"t exert as much force and the leak will be apparent.

This test is very time-consuming with the engine in the car. To do the test, each cylinder must be tested one at a time, they must be at TDC compression, and the crank must be held in place to prevent rotation. A freshly rebuilt engine should have less that 4% leak down on each cylinder and if leak down is above 10%, service should be performed. All cylinders should be within 2 percentage points of each other. NOTE: These figures are for performance engines. Stock production engines may have as much as 10% right off the assembly line.

 

 

 

Digital Multimeters

 

Fluke offers a wide assortment of multimeters to fit every need.

Multimeters are designed to help you do your job faster, more efficiently and with greater accuracy, there is a model for every budget and application. Choose from hand held troubleshooters to ultra smart multi-meters packed with features, including the ability to log and graph data, as well as high-precision bench units

 

The Difference Between Cheap and High Quality Hand Tools

 

Cost: Short Term and Long Term


High-quality tools don’t come cheap, so this may tempt you to turn to cheaper tools to save money. The important thing to consider is this: when you spend more to buy well-made tools, you won’t need to replace them down the line. If you buy cheap socket sets, expect to spend more money to replace them in no time when they fail under pressure. Choosing well-made tools from a trusted brand will actually save you more money in the long-run, a very important consideration if you use your tools to earn a living.

There’s definitely a difference between buying hand tools to use at home and buying those for your trade or making a living. When you’re relying on your tools to bring home money, don’t waste your time and cash on cheap tools that will fail you time and again. Invest your money in well-made tools that will handle abuse and still remain reliable for every job.