job sheet teknik kendaraan ringan - smk kp · pdf file1 job sheet teknik kendaraan ringan...

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JOB SHEET TEKNIK KENDARAAN RINGAN

PEKERJAAN DASAR OTOMOTIF

2014/2015

TEKNOLOGI DAN REKAYASA

NAMA :

KELAS : IO

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DINAS PENDIDIKAN,KEBUDAYAAN DAN OLAHRAGA KOTA METRO

YAYASAN PENDIDIKAN KARYA PEMBANGUNAN GAJAHMADA

SEKOLAH MENENGAH KEJURUAN (SMK) KP GAJAHMADA 1 METRO

KELOMPOK TEKNOLOGI DAN REKAYASA

Bidang Keahlian : Teknik Mekanik Otomotif Status Terakreditasi

Alamat : Jalan Jenderal Sudirman Ganjaragung 14/II Kota Metro Telp (0725) 47674 E-Mail : smkgama 1 [email protected]

JOB SHEET SILINDER BLOK

1. Tujuan : Setelah praktek diharapkan siswa dapat

Membongkar dan memasang kembali silinder blok dengan benar

Menjelaskan fungsi komponen silinder blok dengan benar

Menjelaskan fungsi utama silinder blok dengan benar

Membuat laporan kerja

2. Alat Dan Bahan

1 unit mesin bensin

Kunci ring 10/11, 12/13, 14/15,16/17

Kunci pas 10/11, 12/13

Obeng + -

Palu

3. Keselamatan kerja

Menggunakan peralatan dan perlengkapan keselamatan kerja

Menggunakan peralatan sesuai dengan fungsinya

Membersihkan dan merapikan kembali ruang, peralatan setelah selesai

4. Langkah kerja

Menyiapkan alat dan bahan

Melepaskan seluruh komponen yang berada pada silinder blok

Mengindentifikasi komponen silinder blok pada mesin

Membersihkan komponen

Menyiapkan data untuk laporan

Memasang kembali komponen dengan urutan kerja yang benar

Membuat laporan

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5. Data kegiatan praktek

Urutan pembongkaran

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6. Konstruksi

Blok silinder merupakan bentuk dasar dari mesin yang berfungsi untuk :

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Blok silinder terbuat dari bahan ...........................................................................................

Pada bagian luar terdapat dudukan-dudukan untuk menempatkan kelengkapan mesin seperti:

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Bila dilihat dari susunan silinder, blok silinder dibedakan antara lain :

a. .......................................................................................................................................

b. .......................................................................................................................................

c. .......................................................................................................................................

Tabung silinder ( cylinder boore ) dibuat dengan tujuan agar jika terjadi kerusakan cukup diganti

tabung silindernya. Ada 2 jenis tAbung silinder yaitu

1...............................................

2..............................................

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Gambar komponen

Keterangan gambar

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7. Nama dan fungsi komponen

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8. Prosedur pemeriksaan dengan alat ukur

Bersihkan tabung silinder blok

Memilih alat ukur yang tepat

Mengkalibrasi alat ukur

Melakukan pemeriksaan pada silinder blok seperti petunjuk pada gambar

D - Diameter Silinder…………………mm

- Panjang langkah piston………..mm

- Volume langkah……………………..cc

L

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9. Urutan pemasangan

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10. Kesimpulan

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Catatan

Diperiksa

Instruktur

ISWAHYUDI, S.T

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JOB SHEET PISTON


Membongkar dan memasang kembali piston dengan benar

Menjelaskan fungsi komponen piston dengan benar

Menjelaskan fungsi utama piston dengan benar


2. Alat Dan Bahan

1 unit mesin bensin

Kunci ring 10/11, 12/13, 14/15,16/17

Kunci pas 10/11, 12/13

Obeng + -

Palu





4. Langkah kerja


Melepaskan seluruh komponen yang berada pada mesin

Mengindentifikasi komponen piston pada mesin




Membuat laporan

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Urutan pembongkaran

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6. Konstruksi

Piston dibuat dari bahan yang............................,ringan, dan............................................................

Piston apabila kena panas akan mengembang dan beresiko macet , maka untuk menghindari itu

piston dibuat......................................................................................................................................

Piston mempunyai ukuran yang ditentukan oleh pabrik yaitu ukuran STD ( standar ), bila ukuran

standar sudah rusak sebagai penggantinya dipasang piston yang ukurannya lebih besar yang

disebut...........................................................................................................

Otomatis lubang silinder dilebarkan disesuaikan dengan ukuran pistonnya, pelebaran lubang

silinder disebut................................................................................................

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Gambar komponen

Keterangan gambar

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8. Kegiatan pengukuran

- Bersihkan bagian penampang piston

- Lakukan pengukuran dengan mistar sorong sesuai petunjuk gambar

A A

B B

C C

- Menentukan ketirusan piston

Piston No 1 Piston No 2 Piston No 3

ФA =........................ ФA = .................. ФA =................

ФB =........................ ФB =................... ФB =................

ФC =........................ ФC =................... ФC =................

9. Syarat-syarat yang harus dimiliki piston ketika digunakan untuk mesin

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10. Urutan pemasangan

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11. Kesimpulan

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Catatan

Diperiksa

Instruktur

ISWAHYUDI, S.T

12







JOB SHEET MEKANISME KATUP


Membongkar dan memasang kembali mekanisme katup dengan benar

Menjelaskan fungsi komponen mekanisme katup dengan benar

Menjelaskan fungsi utama mekanisme katup dengan benar


2. Alat Dan Bahan

1 unit mesin bensin

Klem C

Kunci ring 10/11, 12/13, 14/15

Kunci pas 10/11, 12/13

Obeng + -





4. Langkah kerja


Melepaskan seluruh komponen yang berada pada silinder head

Mengindentifikasi komponen mekanisme katup pada mesin




Membuat laporan

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5. Konstruksi mekanisme katup

Mesin dilengkapi dengan katup yang berfungsi untuk..............................................

Kepala katup sering disebut dengan nama daun katup untuk katup isap diameternya dibuat lebih besar , hal ini bertujuan agar....................................................................... Sebab gas yang masuk kedalam silinder hanya mengandalkan perbedaan tekanan

antara udara dari luar dengan penurunan tekanan dalam silinder.Sedangkan katup

buang diamaternya lebih kecil dengan harapan agar......................................................

Jika terjadi kerusakan pada katup maka akan terjadi......................................................

Gambar komponen mekanisme katup

Keterangan gambar 1. ............................... 8. ............................... 2. ............................... 9. ............................... 3. ............................... 10. ............................... 4. ............................... 11. ............................... 5. ............................... 12. ............................... 6. ............................... 13 ............................... 7. ............................... 14. ...............................

15. ...............................

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6. Nama dan fungsi komponen mekanisme katup

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Kegiatan pengukuran - Bersihkan seluruh komponen mekanisme katup - Lakukan pengukuran pada katup mesin sesuai petunjuk gambar - Menentukan ketirusan

Katup silinder No 1 Katup silinder No 2 ФA =............ ФA =............... ФB =............ ФB =................ ФC =............ ФC =................

A A

B B

C C

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7. Penggerak komponen mekanisme katup dapat dibedakann menjadi 3 yaitu

1.....................................................................................................................

2.....................................................................................................................

3.....................................................................................................................

8. Cara kerja mekanisme katup

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9. Kesimpulan

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catatan

Diperiksa

Instruktur

ISWAHYUDI, S.T

16







JOB SHEET POROS ENGKOL ( CRANK SHAFT )


Membongkar dan memasang kembali poros engkol dengan benar

Menjelaskan fungsi komponen poros engkol dengan benar

Menjelaskan fungsi utama poros engkol dengan benar


2. Alat Dan Bahan

1 unit mesin bensin

Kunci ring 10/11, 12/13, 14/15,16/17

Kunci pas 10/11, 12/13

Obeng + -

Palu





4. Langkah kerja



Mengindentifikasi komponen poros engkol pada mesin




Membuat laporan

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5. Data praktek

Urutan pembongkaran ...........................................................................................................................

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Gambar komponen

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6. Fungsi komponen Crank Shaft ...........................................................................................................................

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7. Mengukur benda kerja

Crank pin

Posisi mengukur benda kerja

Posisi mengukur benda kerja

I

X1 :

X2 :

Y1 :

Y2 :

II

X1 :

X2 :

Y1 :

Y2 :

III

X1 :

X2 :

Y1 :

Y2 :

IV

X1 :

X2 :

Y1 :

Y2 :

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8. Mengolah data pengukuran

Menentukan ketirusan: ....................................................................................................................................

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Ketirusan maksimum .......mm

Ketirusan minimum .......mm

Menentukan keovalan : ....................................................................................................................................

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Keovalan maksimum........mm

Keovalan minimum ........mm

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9. Urutan pemasangan ....................................................................................................................................

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10. Kesimpulan

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Catatan

Diperiksa

Instruktur

ISWAHYUDI,S.T

21







JOB SHEET OVERHOUL ENGINE


Membongkar dan memasang kembali seluruh komponen mesin dengan

benar

Menjelaskan fungsi komponen – komponen mesin dengan benar

Menjelaskan tanda-tanda pemasangan komponen mesin dengan benar


2. Alat Dan Bahan

1 unit mesin

Kunci momen

Kunci shock

Kunci ring 10/11, 12/13, 14/15,16/17

Kunci pas 10/11, 12/13

Obeng + -

Palu





4. Langkah kerja



Mengindentifikasi seluruh komponen pada mesin




Membuat laporan

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Menurut siklus kerja motor dibedakan menjadi dua yaitu :

- Motor 4 takt, dimana jumlah langkah yang terjadi pada siklus ini adalah

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- Motor 2 takt, dimana jumlah langkah yang terjadi pada siklus ini adalah

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Mesin bensin terdiri dari mesin itu sendiri dan berbagal macam alat bantu

lainnya. Sedang mesin itu sendiri terdiri dari, blok cylinder, ..................piston,

........................., dan............................... . Alat bantu lainnya pada mesin

dirancang untuk menopang kerja mesin. Diantaranya, pelumasan,

pendinginan, ....................................dan............................... (intake and

exhaust), ..................................... dan sistem kelistrikan.

Gambar komponen mesin

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Keterangan gambar

1. ........................................................... 11. ................................................... 2. ........................................................... 12. ................................................... 3. ........................................................... 13. ................................................... 4. ........................................................... 14. ................................................... 5. ........................................................... 15. ................................................... 6. ........................................................... 16. ................................................... 7. ........................................................... 17. ................................................... 8. ........................................................... 18. ................................................... 9. ........................................................... 19. ................................................... 10. ........................................................... 20. ...................................................


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7. Tanda / kode penting yang terdapat pada bagian mesin

1. .................................................................................

2. .................................................................................

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8. Nama / istilah yang terdapat pada mesin

1. TOP artinya .........................................................................................................................

2. Remer artinya......................................................................................................................

3. Oversize artinya...................................................................................................................

4. Undersize artinya.................................................................................................................

5. OHV artinya..........................................................................................................................

6. OHC artinya..........................................................................................................................

7. DOHC artinya.......................................................................................................................

8. Tune up artinya....................................................................................................................

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9. Kesimpulan ...........................................................................................................................................................

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CATATAN

Diperiksa

Guru budang studi

ISWAHYUDI, S.T

26







JOB SHEET SILINDER HEAD


Membongkar dan memasang kembali silinder head dengan benar

Menjelaskan fungsi komponen silinder head dengan benar

Menjelaskan fungsi utama silinder head dengan benar


2. Alat Dan Bahan

1 unit mesin bensin

Kunci momen

Kunci ring 10/11, 12/13, 14/15

Kunci pas 10/11, 12/13

Obeng + -





4. Langkah kerja


Melepaskan seluruh komponen yang berada pada silinder head

Mengindentifikasi komponen silinder head pada mesin




Membuat laporan

27


Urutan pembongkaran

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Konstruksi

Kepala silinder adalah salah satu komponen utama mesin yang ditempatkan

atas..........................................................................

Dari segi konstruksi kepala silinder harus mampu terhadap temperatur dan tekanan

yang tinggi selama mesin beroperasi.Untuk tujuan tersebut pada umumnya kepala

silinder terbuat dari ...........................................

Namun belakangan ini kepala silinder dibuat dari paduan almunium yang mampu

mendinginkan mesin itu sendiri.

Gambar kepala silindel

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Keterangan gambar

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6. Nama dan fungsi komponen Kepala Silinder

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8. Kegiatan pemeriksaan

Membersihkan seluruh permukaan Kepala Silinder

Gunakan pengukur Mistar Baja dan Feller Gouge untuk melakukan pemeriksaan

Lakukan pemeriksaan seperti petunjuk pada gambar

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9. Hasil pemeriksaan

Posisi B =..........mm

Posisi A = ..........mm

Posisi C =.........mm

Posisi D =.........mm

Posisi E =.........mm

Posisi F =........mm

Posisi G =..........mm

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11. Fungsi utama dari Kepala Silinder

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12. Kesimpulan

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Catatan

Diperiksa

Instruktur

ISWAHYUDI, S.T

31


YAYASAN PENDIDIKAN KARYA PEMBANGUNAN GAJAHMADA SEKOLAH MENENGAH KEJURUAN (SMK) KP GAJAHMADA 1 METRO




JOB SHEET SISTEM PENGAPIAN

1. Tujuan : setelah mengikuti kegiatan praktek diharapkan siswa dapat

Mengetahui fungsi sistem pengapian pada mesin dengan benar

Menjelaskan fungsi masing-masing komponen sistem pengapian mesin dengan

benar

Membuat rangkaian sistem pengapian mesin dengan benar

Membuat laporan praktek

2. Alat Dan Bahan

1 Unit sistam pengapian mesin

Baterai

Obeng + -

Tang

3. Keselamtan kerja




4. Langkah kerja


Mengindentifikasi komponen sistem pengapian mesin

Melepaskan seluruh komponen sistem pengapian mesin dengan hati-hati

Menyiapakan data utuk laporan praktek

Merangkai kembali sistem pengapian mesin dengan benar

Membuat laporan pratek

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Sistem pengapian pada kendaraan menghasilkan tegangan tinggi yang diperlukan

untuk membakar campuran bahan bakar dan udara didalam silinder pada motor

bensin.

Sistem pengapian harus mampu menghasilkan percikan bunga api pada busi pada

waktu yang tepat, yaitu beberapa derajat sebelum pisto TMA pada langkah

kompresi. Percikan bunga api yang dihasilkan dari busi akan membakar campuran

bahan bakar dan udara sehingga menghasilkan usaha ( tenaga ).

Gambar Fering diagram Sistem Pengapian mesin 4 silinder ( FO 1342 )

Keterangan gambar

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7. Fungsi utama dari sistem pengapian

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8. Cara kerja Sistem Pengapian

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9. Kesimpulan

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Catatan

Diperiksa

Instruktur

ISWAHYUDI, S.T

35


YAYASAN PENDIDIKAN KARYA PEMBANGUNAN GAJAHMADA SEKOLAH MENENGAH KEJURUAN (SMK) KP GAJAHMADA 1 METRO




JOB SHEET SISTEM PENDINGINAN

1. Tujuan : setelah mengikuti kegiatan praktek diharapkan siswa dapat

Mengetahui fungsi dari Sistem Pelumasan mesin dengan benar

Mengetahui komponen – komponen Sistem Pelumasan mesin dengan benar

Menjelaskan fungsi masing-masing komponen Sistem Pelumasan mesin dengan benar

Membongkar dan memasang kembali komponen Sistem Pelumasan mesin dengan benar


2. Alat Dan Bahan

1 Unit Sistem Pelumasan mesin

Kunci 10/11, 12/13, 14/15

Kunci T

Pelepas Filter Oli

Obeng + -

3. Keselamtan kerja




4. Langkah kerja

Menyiapkan alat dan bahan praktek

Mengindentifikasi komponen Sistem Pelumasan mesin

Melepaskan seluruh komponen Sistem Pelumasan mesin dengan urutan kerja yang benar

Menyiapkan data untuk laporan praktek

Memasang kembali komponen Sistem Pelumasan mesin dengan urutan kerja yang benar


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Pelumas memegang peranan penting dalam desain dan operasi

semua mesin otomotif. Umur dan service yang diberikan oleh mobil

tergantung pada perhatian yang kita berikan pada pelumasannya.

Pada motor bakar, pelumasan bahkan lebih sulit dibanding pada

mesin-mesin lainnya, karena di sini terdapat panas terutama di

sekitar torak dan silinder, sebagai akibat leadakan dalam ruang

pembakaran.

Gambar komponen

Keterangan gambar

1. .............................................. 9. ...................................... 2. .............................................. 10. ...................................... 3. .............................................. 11. ...................................... 4. .............................................. 12. ...................................... 5. .............................................. 13. ...................................... 6. .............................................. 14. ...................................... 7. .............................................. 15. ...................................... 8. .............................................. 16. ......................................

6. Fungsi Sistem pelumasan pada mesin

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4. ........................................................................................................................... 5. ...........................................................................................................................

7. Skema diagram Sistem pelumasan

8. Cara kerja Sistem Pelumasan ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

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9. Kesimpulan ...........................................................................................................................................................

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Catatan

Diperiksa

Instruktur

ISWAHYUDI, S.T

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