Yangdong Co. Y90 Series Manuel de service télécharger pdf (Page 28)

OPERATION&MAINTENANCE MANUAL

required.

As for a new one, sinking distance between the plane of the air inlet and air outlet

and the plane of the cylinder head is 0.7-0.9mm, as figure 5 indicated. After amendment

to it for many times, the sinking distance may be increased. When it exceeds 2mm, it’s

recommended to change the valve seat.

The valve clearance shall be checked regularly. See Section 1 of chapter V for detail

on adjustment methods. If the valve clearance is excessive, it may affect correctness of

gas distribution and timing and increase noise of the valve structure; insufficient

clearance may lead to incomplete closing and burning of the air valve.

2、cylinder block

Fig.6 protruding height of the liner flange

plane relative to the plane of cylinder

block

The cylinder body is made of cast iron HT250 and portal shape structure is adopted.

Besides the installation hole, bolt hole for cylinder head on the top of the cylinder body,

the water hole to the cylinder head, and lubricant hole at the back of the cylinder body to

the cylinder head are on it.

Water pump and engine oil pump are installed at upper part and lower part of

front-end of the cylinder body. Fly wheel casing is installed at back-end of the cylinder

body. The lubricant inlet and bolt hole for installing crankcase oil tray are located at the

bottom of the cylinder body. When dismantling the diesel for repair, each oil channel shall

be repaired to ensure clean and unblocking. Bulkhead of each channel shall be sealed

and oil leakage is not allowed.

The main bearing is of fully-supported suspending type. Matching brazing is

employed for main bearing casing and the cylinder body. Matching marks are marked on

the cylinder body and main bearing casing. Any exchange or reverse assembling is not

allowed. The main shaft bushing is the shafting bushing of high tin broze zergarl. When

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Yangdong Co. Y90 Series Manuel de service Page 28