Crankweb Deflection
PROCEDURES:
1. Place a deflection gauge opposite the crankpin on the port punch mark point, & set the pointer to zero.
2. Read the deflection gauge at the following points of position drawn above BS, S, T, P, BP. & To get the bottom mean reading use the formula, ½ (BP + BS) =B
3. RECORD & checked crankcase temperature, ship’s trim condition.
4. Note: closing of the Crank web is considered as negatif reading on the deflection gauge. Deflection reading in 1/100mm & should be taken while the ship is afloat not while dry-dock.
Reference by marine engineering handbook
PERSYARATAN PENGAMBILAN DEFLECTION :
1. Kondisi engine dalam keadaan dingin.
2. Semua komponen mesin terpasang.
3. Kapal harus pada posisi steady (diperiksa dengan clinometer)
4. Kapal harus pada posisi evenkeel (diperiksa Draft)
5. Kapal harus diatas air.
6. Ruang muat kapal harus kosong dari muatan.
7. Laut harus tenang tidak berombak.
Crank web Deflection
BEARING LUAR RENDAH
BEARING LUAR TINGGI
BEARING LUAR LEBIH RENDAH DARIPADA BEARING TENGAH
BEARING LUAR LEBIH TINGGI DARIPADA BEARING TENGAH
