Yanmar 3JH4E Manual de Serviço descarregar pdf (Página 111)

5. Inspection and Servicing of Basic Engine Parts

5.1.5 Cylinder bore measurement

Especially clean head surface, cylinder bores and oil

holes, and check the below items after removing any

carbon deposit and bonding agent.

(a) Appearance inspection

Check if there is any discoloration or crack. If crack is

suspected, perform color check. Sufficiently clean the

oil holes and check they are not clogged.

(b) Cylinder bore and distortion

Measure at 20 mm below the crest of the liner, at 20

mm from the bottom end and at the center in two

directions A and B as shown in the below figure.

Roundness:

Roundness is found as follows though it is the

simple method.　Measure cylinder diameters of the

A direction and the B direction on each section of a,

b and c.

Roundness is the maximum value among those

difference values.

Cylindricity:

Cylindricity is found as follows though it is the simple

method.

Measure cylinder diameters of a, b and c sections in

the A direction, and calculate the difference in

maximum value and minimum value of the

measured diameters.

In the same way measure and calculate the

difference in the B direction.

Cylindricity is the maximum value between those

difference values.

Standard Limit

Cylinder bore dia. 88.000-88.030 88.200

Cylinder

roundness/

Inclination

0.01 or less 0.03

(Cylinder bore)

20 mm

Measure in two directions

A and B at points a, b and c.

20 mm

(Cylinder bore measurement positions)

1 2 ... 106 107 108 109 110 111 112 113 114 115 116 ... 213 214

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Yanmar 3JH4E Manual de Serviço Página 111

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