CWEA Maintenance Technologist Practice Test 2026 – Complete Exam Prep

Question: 1 / 400

What is wet stacking and how can it be prevented?

A fuel leak from the injection system

A condition in diesel engines where fuel is burnt effectively

A condition where unburned fuel passes into the exhaust system

Wet stacking refers to a phenomenon that occurs in diesel engines, particularly during low-load or idle operation. In this condition, unburned fuel accumulates in the exhaust system because the engine is not running at optimal temperatures to fully combust the fuel. As a result, this excess fuel can lead to excessive black smoke, carbon buildup in the exhaust system, and potential damage to engine components over time.

To prevent wet stacking, it's essential to operate diesel engines at their designed load capacities. Regular maintenance, including monitoring fuel systems and ensuring the engine is warmed up sufficiently before use, can also help mitigate this issue. Proper engine loading and temperature management are critical in ensuring complete combustion and minimizing the chances of unburned fuel entering the exhaust.

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A buildup of oil in the engine oil pan

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