Mechanical Diesels are tough to diagnose, and very few tools help with it. The GTC605 helped us repair this small, old, unevenly-timed Yanmar 2GM. This 1984 Yanmar 2GM is a 40-year-old two cylinder indirect injection Diesel engine with jerk-type injectors. This type of small twin generally runs a bit rough because the timing is uneven (180-540 degrees), which tends to mask minor issues, but the GTC605 helped us uncover the problems.
Fuel Injector Circuit Waveforms by Andrew Markel This article explains the basics of a solenoid injector’s voltage and current waveforms. Read Article at Tomorrows Technician Testing Piezoelectric Injectors by Joe Clark A look at some methods of testing piezoelectric injectors, both on-engine and off-engine. Read Article at TechTips.ie Diagnosing and Servicing Gasoline Direct Injection …
Diesel engines are notoriously smoky, producing much more blue, white, and black smoke than their gasoline-powered counterparts. The fundamental reasons for this are that diesels operate at higher pressures, with lower-purity fuel, and variable fuel-air ratios. This post covers the different types of smoke, and their (complicated) causes.
Long and short-term fuel trim are very useful indicators of engine performance relative to the manufacturer’s specifications, but before we get into what they tell you, we’ll go over what they are.
