Brief Overview of Caterpillar C7 Engines
This popular engine can often be found in on-highway trucks, and also in off-highway applications such as loaders, skidders, excavators, motor graders, and industrial and marine units. It is actually a 7.2 liter (439 cid) engine with a 4.33? bore (110mm) and 5.0? stroke (127mm). Note: This engine was also covered in more detail in
Common Coolant Concerns – Know What You Know And Question the Rest
My column on issues surrounding the PCV system may have bordered on the mundane to some of you, but there was a method to the madness. When you stop to think about how often the PCV system is the root cause of a problem you just can’t talk about it often enough. I think of
Cylinder Block Prep Tips
First, you want to look for cracks on the water jacket area and in the lifter valley area. If the block has ever been frozen, this is where cracks will show up. Next, look for cracks around the main webs, these are hard to spot when the block is greasy, but we are just looking
Common Rail Injection History: Less Conspiracy, More Efficiency
It seems as though when customers are at the shop, the question always arises as to what common-rail really means. Then after I explain the technology to them, the reply that I get is, “Why did they have to change everything and start using computers?” If you find yourself in a similar boat and have
Pneumatic Tool Innovations
Pneumatics is that section of technology that deals with the study and application of pressurized gass to affect mechancial motion. Or, said differently, pneumatic tools use compressed gas (usually air) to make them work. I would venture to guess that most, if not all, of you reading this use air tools frequently, or have used
Tips and Tricks For Quickly and Accurately Detecting Cracks
Dry Method Magnetic Particle Inspection When "Magnafluxing" a casting, never blast with media prior to testing.Blast media peens the surface and can move metal, possibly closing thevery cracks or flaws that you are trying to identify. When very coarsewire brushes are used roughly, they can also mask these areas. Usuallythe casting itself, without cleaning, is
Engine Building Measuring Tools
The French created a measurement system in 1790 called the metric system. While the U.S. has never managed to switch over to it completely, as we were supposed to in the latter half of the 20th century, most automotive techs are familiar with it today because of the fasteners and components on late model vehicles.
Camshaft & Valvetrain Technology Overview
Camshaft and valvetrain technology is a topic we’ve written much about over the years. A rotating eccentric lobe on a camshaft still opens the valves. In the case of an overhead valve engine, the cam lobe pushes a follower or bucket tappet to open the valve. With a pushrod engine, the cam lobe pushes a
Manganese Phosphate Coating on Compression Rings
This black coating is on the ring for two important reasons. The coatingis manganese phosphate. The reason rings are coated is twofold (1) rustprevention and (2) oil retention for protection against scuffing in early engine operation. Rust prevention is necessary for the period of time the ring is in the set box sitting on a
Power Adders: Turbos, Blowers and Nitrous
The engine can only inhale so much air because the atmospheric force that’s pushing air into the engine is only 14.7 lbs. per square inch at sea level. To make matters worse, atmospheric pressure decreases with elevation. Air density also decreases with temperature because hot air is thinner than cold air. Most stock naturally aspirated engines
New Products for Modern V8 Engines
The numbers aren’t there yet, but engine builders and suppliers are taking notice of the new V8s. What has taken so long? For one, the new engines are more expensive and more complex. Some shops do not have the capability or expertise to work on them just yet, but more and more shops do. One
Diesel Engines: Dino Fuel or Bio Fuel?
Though they lately seem to be going the other way, with rising fuel prices, consumers are constantly looking for inventive ways to cut fuel costs and consumption. That’s the American spirit: we love to look for ways to beat the system. There is nothing wrong with this attitude, because this is where inventive minds
Engine Builder Shop Solutions: June 2012
Reducing Vibrations And Chatter Vibrations when machining with extended length setups can not only cause chatter and premature tool failure, but also reduce spindle bearing life and lead to poor surface finish, dimensional control issues and premature tool wear. Shops are often forced to reduce cutting parameters to avoid chatter, decreasing productivity. Chatter occurs when
Cooling System Confusion Can Lead to Contentious Comebacks
They may or may not have had some type of formalized education – yet, they may be well versed and very savvy but have not had the infield experience as of yet. They are not necessarily young, just new to the world of engines. For them (and even for the veterans), let me give you
What
That’s why you have to choose the gaskets you install very carefully. Gaskets have to fit correctly and have the durability to maintain a long lasting seal. Applications that are unusually demanding often require specially engineered gaskets that can handle higher pressures and temperatures without failing. Advancements are constantly being made in gasket materials and
Head Gaskets 101: Part 1
In 1991, Ford introduced the 4.6L OHC V-8, commonly referred to as the Modular Ford V-8. It had, for its time, a revolutionary new head gasket design called MLS. Prior to that, most head gaskets were steel core designs with some sort of gasket paper attached to the core, so this was a big change
Cleaning Engine Parts: Can You? Should You?
Here’s the kicker – those shops who feel that proper cleaning is too difficult, too time consuming or too expensive are actually leaving money on table when it comes to their engine parts. “At one point in my career, cleaning seemed like it was really difficult,” says Dave Arce of Arce Enterprises, El Cajon, CA.
Engine Balancing: Old School Experience Meets New Technology
The one fact that has held true from the first engine built till today is you must have balance to hold things together and not vibrate apart. I am a Performance Engine Technology Instructor at Daytona State College, therefore I must give you a short applied physics lesson first. The force of a rotating object
The Nitty Gritty of Abrasive Safety
Conventional abrasives have kind of taken a back seat to PCD and CBN cutters in the automotive world in the last few years. Since most engines being rebuilt these days are made from multi-alloy components they are more easily machined with PCD or CBN. But PCD and CBN can’t do everything, so abrasives are still
Issues You May Face When Rebuilding GM Gen IV Engines
There are a couple of problems with the Gen IV motors that may affect how you rebuild the AFM motors, especially the ones with aluminum blocks. • Lifter noise after a two-hour shutdown can be an issue with the engines that have AFM. If the ticking lasts more than 10 seconds after startup and it’s