Choirul Fatah Hidayatulloh, Muhammad Khumaedi, Samsudin Anis

Nozzle Tester Teaching Tool to Enhance Learning Outcomes in Conventional Diesel Engine System for Light Vehicles

Introduction

Nozzle tester teaching tool to enhance learning outcomes in conventional diesel engine system for light vehicles. Enhance learning outcomes for conventional diesel engine systems. This R&D study developed a practical, effective nozzle tester from a recycled jack, improving automotive education.

Abstract

The nozzle tester, which is commonly used in the automotive engineering program at SMK N 1 Kedungwuni, is in a leaking condition, limiting its effectiveness in supporting learning and consequently affecting student learning outcomes. This issue is the main reason for conducting research on the development of a nozzle tester using a recycled jack, aimed at enhancing the learning of conventional diesel engine systems. This study employs a Research and Development (R&D) approach with the ADDIE model for development. The research method used is a pretest-posttest group design. The findings of the study include: (1) the developed teaching tool was considered feasible by media and subject matter experts, with content validity ratio (CVR), content validity index (CVI), and percentage of agreement (PA) analyses; (2) product trials showed a high level of effectiveness, demonstrated by the Independent Sample t-Test, where the N Gain Score resulted in a significant (2-tailed) value; and (3) the reproducibility coefficient (Kr) and scalability coefficient (Ks) both indicate that the application of the nozzle tester in the conventional diesel engine system learning process is very practical. The conclusion of this study is that the nozzle tester can significantly improve the learning outcomes of conventional diesel engine systems.

Review

This study presents a timely and practical solution to a common challenge in vocational automotive education: the availability of functional teaching tools. The authors identify a critical issue at SMK N 1 Kedungwuni, where a faulty nozzle tester significantly impedes the effective learning of conventional diesel engine systems and consequently impacts student learning outcomes. In response, the research focuses on developing an innovative and cost-effective nozzle tester by repurposing a recycled jack, aiming to directly address this deficiency and enhance the quality of instruction in a fundamental automotive subject for light vehicles. The methodology employed is a robust Research and Development (R&D) approach, utilizing the well-structured ADDIE model for product development, coupled with a pretest-posttest group design for evaluating its impact. The findings are systematically presented and appear compelling. Firstly, the developed tool demonstrates strong initial validation, with both media and subject matter experts attesting to its feasibility through analyses such as Content Validity Ratio (CVR), Content Validity Index (CVI), and Percentage of Agreement (PA). Secondly, subsequent product trials reveal a high level of effectiveness, evidenced by a significant N Gain Score in an Independent Sample t-Test. Finally, the practical application of the nozzle tester is underscored by favorable reproducibility (Kr) and scalability (Ks) coefficients, suggesting its potential for broader adoption. Overall, this paper outlines a commendable effort to bridge the gap between educational needs and available resources, offering a tangible solution that is both innovative and practical. The combination of expert validation, rigorous statistical analysis of learning outcomes, and an assessment of practicality provides a strong case for the utility and impact of the developed teaching tool. The abstract clearly articulates the problem, the solution, and the positive outcomes, concluding confidently that the recycled jack nozzle tester can significantly improve learning outcomes for conventional diesel engine systems. This work represents a valuable contribution to vocational education, particularly in resource-constrained environments, and warrants further attention for its potential to be replicated and scaled.

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