NOCTI Outdoor Power Equipment Practice Exam 2026 – Complete Prep Guide

The function of the oil seal in small engines is primarily to prevent oil leaks from the engine. Oil seals are specifically designed to maintain the integrity of the engine's oil system by sealing areas where shafts enter and exit, such as the crankshaft and camshaft. This sealing action prevents the engine oil, which is vital for lubrication and cooling, from escaping, thus ensuring that the engine operates efficiently and remains properly lubricated.

It’s crucial for running a small engine effectively because oil leaks can lead to decreased lubrication, which can cause engine wear and damage over time. By keeping the oil contained within the system, the oil seal plays a key role in the longevity and reliability of the engine.