Diagnostic Solutions: Cooling Fan Failure Diagnosis
Cooling fan operation is often taken for granted by many technicians because testing a cooling fan requires at least 15 minutes of fast idling or running until the coolant temperature reaches 220-230° F. If the cooling fan doesn’t activate, a coolant temperature sensor, fan relay, fan electrical circuit or the fan itself may be at
Tech Tip: Catalytic Converters Play an Important Role in the Emissions-Compliant Engine
The design and function of catalytic converters has changed dramatically since their introduction in 1975. The first "two-way" catalytic converters were oxidizing-only designs that combined hydrocarbon (HC) and carbon monoxide (CO) with oxygen to form water vapor (H2O) and carbon dioxide (CO2). Oxidizing converters were originally manufactured in pellet bed or monolithic "honeycomb" styles. Currently, the monolithic style has proven to be the most durable.
Choosing the Right Tools for Diesel Engine Service
Diesel engines are a popular alternative to gasoline engines because of their good fuel economy and torque. The main difference with working on diesels versus gasoline engines is that diesels have no ignition system. There are no spark plugs or ignition coils, but they do have glow plug start-up systems to help the fuel ignite when a cold engine is first cranked.
Diagnostic Solutions: Catalytic Converters
The design and function of catalytic converters has changed dramatically since their introduction in 1975. The first “two-way” catalytic converters were oxidizing-only designs that combined hydrocarbon (HC) and carbon monoxide (CO) with oxygen to form water vapor (H2O) and carbon dioxide (CO2). Oxidizing converters were originally manufactured in pellet bed or monolithic “honeycomb” styles. Currently,
Gear Clash: Courting Trouble
Do you swear to tell the truth, the whole truth, and nothing but the truth?” “Yes.” “Be seated.” This was the second time I had been summoned to court to tell the side of our repair shop in a civil case of a customer against my employer; the same employer each time. This was also
Diesel Engine Service, Tools & Equipment
Diesel engines are a popular alternative to gasoline engines because of their good fuel economy and torque. More than 55% of heavy-duty pickup trucks are now powered by diesel engines, as are 85% of Class 5 to 7 medium-duty trucks. The GM Duramax, Ford Powerstroke and Dodge Cummins Turbo Diesel engines represent the bulk of
Tech Tip: Pleasant Surprise – Plugging Nissan Head Leak
Any technician who has worked extensively with Asian-made vehicles has more than a casual acquaintance with head gasket replacements. It comes as no surprise that when you put an aluminum head on a cast iron block, the different expansion rates of the two metals will eventually weaken the head gasket.
Engine Diagnostics: Mazda
We’re going to take a look at the Mazda line of cars and trucks with an eye on driveability service and diagnosis. In particular, we’ll look at some driveability problems that may result in an illuminated check engine light, as well as some problems that will illuminate the light but may not result in a
Power Options: Restoring a Vehicle to Like-New Performance
Replacing a worn or broken engine on a customer’s vehicle can be a very sensitive subject for many independent shop owners because it’s a time-intensive and possibly high-liability service. After a replacement is done, a shop’s greatest fear is that a minor ticking noise or oil leak may ruin the profitability of the engine replacement.
Component Connection: The Circle of (Engine) Life
Amazingly, up to a third of the heat energy produced inside an engine’s combustion chambers ends up as waste heat that goes into the block. This heat must be eliminated, otherwise the engine will overheat and self-destruct. The water pump keeps coolant circulating between the engine and radiator to get rid of the heat. The