Comparison of the Temperature of a C223 Diesel Engine with and without a Thermostat at 1500 RPM

Muhammad Fatkulloh; Achmad Rijanto; Nuril Ahmad

doi:10.59890/ijatss.v4i8.277

Authors

Muhammad Fatkulloh Teknik Mesin Unim
Achmad Rijanto Teknik Mesin Unim
Nuril Ahmad Teknik Mesin Unim

DOI:

https://doi.org/10.59890/ijatss.v4i8.277

Keywords:

Thermostat, Diesel Engine, Engine Temperature, Cooling System

Abstract

This study investigates the effect of thermostat installation on the operating temperature of a C223 diesel engine during the warm-up period, addressing the common practice of removing the thermostat despite its documented negative effects on engine performance. A quantitative experimental method with a comparative approach was employed, testing two cooling system configurations, with and without a thermostat, at a constant engine speed of 1500 rpm under idle conditions. Temperature was measured using an infrared thermometer at 2, 4, and 6 minutes after engine start-up, with each condition repeated three times. The results showed that the engine equipped with a thermostat reached higher average temperatures (48.8°C, 68.7°C, and 81.8°C at 2, 4, and 6 minutes, respectively) than the engine without a thermostat (39°C, 46°C, and 50.6°C), with the difference becoming more pronounced over time. It is concluded that the thermostat significantly improves the warm-up performance of the C223 diesel engine by regulating coolant circulation, and its maintenance according to manufacturer specifications is recommended to ensure optimal engine performance and combustion efficiency

References

Abd, M., Zulfadli, T., Yusuf, M., Kamarullah, K., Mulkan, A., Safrizal, S., Azmal, A., & Zulfan, Z. (2024). ANALISIS PERUBAHAN SUHU PADA SISTEM PENDINGIN RADIATOR MESIN TOYOTA COROLLA. Jurnal Mekanova : Mekanikal, Inovasi Dan Teknologi, 10(2), 486. https://doi.org/10.35308/jmkn.v10i2.10682

Albert K. Arkoh, Esther B. Kyere, & Isaac Edunyah. (2021). Comparative analysis of engine running performance with and without thermostat. International Journal of Science and Research Archive, 4(1), 047–053. https://doi.org/10.30574/ijsra.2021.4.1.0171

Burke, R D, Brace, C J, Hawley, J G, & Pegg, I. (2010). Review of the systems analysis of interactions between the thermal, lubricant, and combustion processes of diesel engines. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 224(5), 681–704. https://doi.org/10.1243/09544070JAUTO1301

Destra Amni, O., Amin, B., & Jurusan Teknik Otomotif Jln Hamka Air Tawar, Mp. (2014). PENGARUH PELEPASAN THERMOSTAT TERHADAP KONSUMSI BAHAN BAKAR PADA MESIN TOYOTA KIJANG 5K.

Fathallah, A. Z. M., Busse, W., & Clausthaldi, F. R. (2025). Fluid Flow Analysis of Jacket Cooling System for Marine Diesel Engine 93 KW. International Journal of Marine Engineering Innovation and Research, 1(2), 39–45. https://doi.org/10.12962/j25481479.v1i2

Feriyanto, D., Alva, S., Vikaliana, R., & Kristanto, A. S. (2022). ANALISIS SISTEM PENDINGIN MENGGUNAKAN THERMOSTAT DAN TANPA THERMOSTAT DALAM PENCAPAIAN PANAS MESIN PADA ALAT UJI PRESTASI. Jurnal Rekayasa Mesin, 13(3), 637–646. https://doi.org/10.21776/jrm.v13i3.757

Hariyanto, A., Pengajar, S., Mesin, J. T., Madi, A., Laboratorium, P., Arbain, P. M., Perawatan, M. P., Perbaikan, D., Politeknik, M., & Samarinda, N. (2022). PENGARUH PENGGUNAAN JENIS COOLANT STANDARD DAN COOLANT PRESTONE PADA SISTEM PENDINGIN TERHADAP TEMPERATURE ENGINE TOYOTA INNOVA DIESEL 2.4 G A/T 2017 2.2L 2012. Agus Hariyanto, MeKanik, 15(2).

Heywood. (2018). I nternal Combustion Engine Fundamentals.

Dietsche, Prof. Dr.-Ing. Konrad Reif, approx. 280 authors from industry, & the university and college sector. (2019). Alphabets and numbers * Automotive Handbook 11th Edition.

Pamulang, U. (2019). ANALISIS VARIASI JUMLAH SUDU DAN CAIRAN PENDINGIN (COOLANT) PADA KINERJA MESIN TERHADAP EFISIENSI BAHAN BAKAR DAN PENCEGAHAN TERJADINYA OVERHEATING. In Jurnal Ilmiah TEKNOBIZ (Vol. 8, Number 1).

Prasetyo, D. (2022). TEMPERATURE EXHAUST GAS ANALYSIS ON THE SHIP ENGINE. Jurnal Rekayasa Mesin, 13(3), 629–635. https://doi.org/10.21776/jrm.v13i3.752

Suryapradana, I., & Halim, A. (2024). Analysis of Application of the Thermostat in the Cooling System of the Nissan CWB 45 Dump Truck Engine. Sebatik, 28(2), 313–319. https://doi.org/10.46984/sebatik.v28i2.2496

Syamsuddin, U., Razi, M., Halik, A., Studi Perawatan, P., Mesin, P., Teknik Mesin, J., Negeri Samarinda, P., & Studi Teknik Alat Berat, P. (2025). Pengaruh Pelepasan Termostat Terhadap Temperatur Mesin. Jurnal Teknologi MEDIA PERSPEKTIF, 17(1), 1–05. http://e-journal.polnes.ac.id/index.php/mediaperspektif/index

Zacharewicz, M., Zadrąg, R., Bogdanowicz, A., Socik, P., Wirkowski, P., & Hołownia, J. (2024). Evaluation of the impact of the thermal state of a diesel engine on its efficiency. Combustion Engines, 196(1), 30–36. https://doi.org/10.19206/CE-170793