Heavy Machinery Engineering
Technical articles based on official manuals from Caterpillar, Cummins, Volvo, and other manufacturers. Deep dives into diesel engines, hydraulic systems, and engineering fundamentals.
English version is growing
Currently 11 articles translated. For the full catalog with 600+ articles and 14 calculators, visit the Spanish site.
All English articles
Mineral vs Synthetic Oil: When to Use Each
Mineral oils cost less, synthetics last longer. We explain the differences, when each is justified, and what semi-synthetic oils are.
What Lubricating Oil Is: Fundamentals and Function
Lubricating oil prevents wear from friction in machines and engines. We explain what it is, how it's made, base oil types, and why it's critical.
ACERT vs SCR: Two Philosophies for Cutting Diesel Emissions
Cat bet on ACERT (attack NOx inside the cylinder). Cummins, Volvo, and Detroit bet on SCR (treat it afterward). A technical comparison.
Volvo D7E Engine: What It Is, Applications, and Features
The Volvo D7E is a 6-cylinder, 7-liter engine with common rail and Euro 4 SCR, used in medium trucks and buses. We cover all its features.
Cummins ISX Fuel System: HPCR Common Rail Explained
The Cummins ISX/Signature fuel system uses high-pressure pumps and HPCR common rail. We cover the pump, filters, lines, and pressure regulation.
Cummins ISX/Signature Troubleshooting: Common Symptoms
Cummins ISX engines have characteristic failure symptoms. We cover the 15 most common per the official manual: low power, smoke, noise, temperatures.
Cummins Signature, ISX, and QSX15 Engines: The Complete Guide
The Cummins Signature, ISX, and QSX15 are the most widely used 15-liter engine family in heavy trucks and equipment. We cover features, differences, and applications.
How a DPF Works Inside: Substrate, Catalyst, and Washcoat
Ceramic substrate, platinum/palladium catalyst, and washcoat: how the DPF's internal layers work together to trap and oxidize soot.
What Is a DPF (Diesel Particulate Filter): Function and Types
The DPF is the filter that traps particulate from diesel exhaust. We explain what it is, how it works, types, materials, and why it's mandatory.
What Is Caterpillar's ACERT System and How Does It Work
ACERT combines 5 technologies (series turbochargers, CGI, DPF, high-pressure injection, and valve actuation) to meet EPA 2007 without sacrificing power.
Variable-Vane Turbocharger Nozzles: Optimizing Engine Performance
Explore how the variable-vane turbocharger nozzle adjusts boost pressure to optimize engine performance across different speed and load conditions.
Topics covered
- Diesel Engines
Caterpillar ACERT, Cummins ISX/Signature, Volvo D7E — architecture, diagnostics, service
- Hydraulic Systems
Pumps, valves, cylinders, motors, oils and maintenance
- Oil Analysis
API/SAE/ISO classifications, SOS testing, additives, contamination
- Emissions Standards
EPA Tier 4, Euro Stage V, ACERT vs SCR, DPF and DEF systems