Carley’s Corner: Smoother Surface Finishes for Today’s Engines
As engine technology continues to advance, so do the surface finish requirements for many of today’s gaskets. Some engines today require an almost mirror-like finish on the cylinder head and block deck surfaces to seal the head gasket – which means many machine shops may need to upgrade their surfacing equipment to achieve the smoother
Why Go Digital? For Precision and Protection
These days, no matter what kind of automotive repair work you specialize in, virtually every system has a certain amount of electronics. Consequently, one diagnostic tool every technician needs is a digital multimeter. To figure out electrical and electronic problems, you have to “see” what’s going on inside the circuits and components. Trouble is, you
Always Inspect Hardware During Brake Repairs
Though it isn’t required, many brake experts recommend replacing the drum hardware when the brakes are relined to restore the brakes to like-new condition. But often the hardware isn’t replaced because it doesn’t seem necessary. Unless the hardware is badly corroded or shows obvious signs of stress, like severe heat discoloration or other visible damage,
Internal Engine Repairs: Why Head Gaskets Fail
A blown head gasket is bad news for any motorist. It means the cylinder head has to be removed, and possibly resurfaced, to replace the head gasket. If coolant has entered the cylinders and/or crankcase, additional repairs or a whole new engine may be needed depending on the extent of the damage. Anyway you look
Checking into Mode $06
Mode 06 is the actual system test data that OBD II looks at when it decides to set a pending code or a current fault code. If the test data is within the limits established by the vehicle manufacturer, the item gets a PASS and no codes are set. But if a value is out of range, OBD II flags it with a FAIL and keeps an eye on the component until the system monitor has run at least twice. Then, if the problem is still there, a DTC is set and the MIL light comes on.
The Ins and Outs of Diagnosing Battery, Charging and Starter Problems
You answer the phone and the voice on the other end says, “My car won’t start.” When temperatures drop, the no-start calls start pouring in. Cold weather increases the strain on the battery, starting and charging system and tends to bring out any weaknesses in these components. Cold weather thickens the oil and makes the
Engine Lubrication: Motor Oil, Pumps and Filters
The best way to get to the bottom of this subject is to go right to the heart of the engine’s lubrication system and start with the oil pump. The oil pump’s job is to suck oil in from the crankcase and push it through the filter and oil galleries to the crankshaft and camshaft
OHC Engine Repairs and Service on Chrysler’s 3.5L V6
Chrysler’s 24-valve 3.5L single overhead cam V6 engine was introduced back in 1993 in their LH platform cars (Chrysler Concorde, Dodge Intrepid and Eagle Vision). Since then it has been used in a variety of Chrysler models. The 3.5L engine is an even-firing power plant with aluminum cylinder heads, a single camshaft in each cylinder
Mufflers & Exhaust Systems Exchanging Stock for High-Performance
High-performance mufflers and exhaust systems are as much about looks and sound as they are about horsepower. Most customers who want these types of products want mufflers and exhaust systems that look and sound as good as they perform. It’s all about personalizing their vehicle and projecting an image. Customers who buy performance exhaust products
GM Timing Belt & Chain Service
Some overhead cam engines in General Motors vehicles use timing belts to drive the cam (the 2.0L for example), some use chains (2.3L Quad Four, Cadillac’s Northstar dual overhead cam 4.6L V8, the Aurora Northstar 4.0L V8 and Chevy’s Vortec 4200 inline six), and some use a combination of both (Chevrolet’s 3.4L V6). The rest
Smooth Sailing: Steering, Suspension & Ride Control Repair Opportunities
Original equipment chassis parts on late-model cars and trucks are supposedly engineered to go 150,000 miles or more. But is that 150,000 miles of highway driving on nice smooth roads or 150,000 miles of bumps, potholes and rough roads? The OEMs say it’s some of both. Nobody can predict exactly how long a chassis part
Underhood Service: Troubleshooting Troublesome Injectors
Clean fuel injectors are a must for peak engine performance, fuel economy and emissions. If the injectors are dirty and can’t deliver their normal dose of fuel, then performance, fuel economy and emissions are all going to suffer. Dirty injectors can’t flow as much fuel as clean ones, nor can they deliver the correct spray