ANALISA PENYEBAB KERETAKAN CYLINDER HEAD PADA MESIN INDUK DI MT. ALEXANDRIA

ALUN, PRABOWO (2019) ANALISA PENYEBAB KERETAKAN CYLINDER HEAD PADA MESIN INDUK DI MT. ALEXANDRIA. Diploma thesis, POLITEKNIK ILMU PELAYARAN SEMARANG.

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Abstract

ABTRAKSI Alun Prabowo, 2017, NIT: 50134984 T, "Analisa Penyebab Keretakan Cylinder head pada Main Engine di MT. Alexandria”. Dengan Metode Software, hardware, environment, liveware (SHEL) dan urgency, seuriusness, growth (USG), Program D IV, Politekhnik Ilmu Pelayaran Semarang, pembimbing (1) H. Suwondo, MM, M.Mar.E. (2) Febria Surjaman, M.T. Cylinder head main engine merupakan bagian mesin yang sangat penting dalam menunjang pengoperasian main engine. Cylinder head berfungsi sebagai penutup cylinder dan sebagai tempat injektor untuk mengabutkan bahan bakar. Cylinder head terdiri dari injector, exhaust valve, starting valve, intake alve, pendingin. Cylinder head harus dibantu dengan proses pendinginan yang baik untuk menghindari kerusakan. Peneliti menggunakan metode USG (urgency, seriousness, growth) dan metode software, hardware, environment, liveware (SHELL) untuk mengetahui prioritas permasalahan yang menyebabkan keretakan cylinder head. Keretakan cylinder head pada main engine disebabkan oleh kelelahan bahan yang tidak sesuai jam kerja (running hours), tidak maksimalnya pendinginan cylinder head, kurang berjalanya PMS (plan maintenance system) serta terjadinya pembakaran susulan (detonasi) Faktor penyebab keretakan cylinder head adalah kelelahan bahan cylinder head, tidak optimalnya pendinginan pada cylinder head, kurang berjalannya PMS (plan maintenace system) dan terjadinya pembakaran susulan (detonasi). Dampak keretakan cylinder head adalah berkurangnya tenaga mesin akibat masuknya air pendingin ke dalam ruang bakar. Upaya untuk mengatasi keretakan tersebut adalah dengan mengganti cylinder head dengan yang baru, selalu mengecek dan merawat sistem pendinginan, melakukan PMS (plan maintenace sytem) dengan sungguh-sungguh dan melakukan penyetingan timming bahan bakar dengan benar sesuai manual book. ABSTRACT Alun Prabowo, 2017, NIT: 50134984 T, "Analysis of the crack in cylinder head Main Engine on MT. Alexandria”. Dengan Metode Software, hardware, environment, liveware (SHEL) dan urgency, seuriusness, growth (USG), Program D IV, Politekhnik Ilmu Pelayaran Semarang, pembimbing (1) H. Suwondo, MM, M.Mar.E. (2) Febria Surjaman, M.T. Cylinder head main engine is an engine part that is very important in supporting the operation of the main engine. Cylinder head functions as a cylinder cover and as an injector to ignite fuel. Cylinder head consists of injectors, exhaust valve, starting valve, intake valve, cooler. Cylinder head must be assisted by a good cooling process to avoid damage. The researcher used the USG method (urgency, seriousness, growth) and software, hardware, environment, liveware (SHELL) methods to determine the priority of the problems that caused the cylinder head crack. Cylinder head cracks on main engine are caused by fatigue of material that does not work (running hours), not maximum cooling of the cylinder head, lack of PMS (plan maintenace system) and subsequent combustion (detonation). Factors from the rules of the manual (software), machine damage (Hardware), environmental factors (environment) and the factor of human negligence (liveware) will be seen how the solution to overcome the factors that cause cracks in the cylinder head. Then from several of these factors, the priorities of the factors that will be discussed by the USG method (urgency, personality, growth) will be obtained. The discussion of this thesis explains about factors, impacts, ways to overcome and prevention efforts. Cracks occur due to the fatigue of the cylinder head material due to lack of maintenance and age factors, lack of cooling to the cylinder head, lack of PMS running and human detonation. The effort to overcome the cracks is to replace the new cylinder head with sound and take care to extend the life of the cylinder, always check and maintain the cooling system, carry out PMS in earnest and make fuel tuning correctly according to the manual book.

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