Bukh DV36/48, Руководство по ремонту

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IJ12
009W2329-R01
Cylinder liner
The bore of the cylinder liner is 85.000 – 85.020 mm (3.3464 – 3.3472 inch). The cylinder liner must
be exchanged when it is worn max. 0.3 mm (0.012 inch).
Measuring of Cylinder Wear
Place a new piston ring in the upper end of the liner where this is not worn. Measure the piston ring
gap with a feeler gauge. This will be e.g. 0.3 mm (0.012 inch). Place the piston ring lower in the liner
where it is worn and measure the piston ring gap again which is now e.g. 0.9 mm (0.0354 inch).
The wear of the liner is then (0.9 – 0.3) / 3 = 0.2 mm. That is: Largest measure less smallest measure
divided by 3 (approximate value for ¶).
The cylinder liner can also be measured with a cylinder template gauge.
Dismounting of Cylinder Liner
1. Remove the cylinder head (see section C page 7).
2. Take out the pistons (see page IJ 3).
3. Cover the connecting rod journals with a piece of oil paper or plastic.
4. Pull out the cylinder liners with a special tool or place the engine block on the side and knock out
the cylinder liners carefully with a wooden block as filling piece. Knock the liners from the bottom
and upwards.
Mounting of Cylinder Liner
There is no gasket between cylinder liner and the engine block at the top. The joint faces must
therefore be completely clean and without burrs. Grind with abrasive compound, if required.
The rubber rings of the lower edge of the cylinder liner must be renewed at each disassembly and
they must not be twisted when mounting.
The rubber rings and the collar may be supplied with a thin coat of jointing paste at the mounting.
When the above things are in order put back the cylinder liner in the engine block – by means of a
wooden block.
After the mounting you must check the clearance of the liner above the engine block. This clearance
must be 0.10 – 0.20 mm (0.0039 – 0.0079 inch).