Yanmar 6LY3 series Service Manual

ENGINE
Inspecting the Cylinder Block and Components
5-22 6LY3 Service Manual
© 2007 Yanmar Marine International
INSPECTING THE CYLINDER
BLOCK AND COMPONENTS
The cylinder block is a light alloy casting machined
with functionally designed ribs and support
structures. The side walls are shaped to maximize
rigidity, strength and quiet operation.
Perform a visual inspection for cracks on engines
that have been exposed to freezing temperatures,
have overturned or been subjected to undue stress.
Perform a dye penetrant inspection on any
suspected cracks. Replace the cylinder block if a
crack is not repairable.
Inspecting Oil Passages and Freeze
Plugs
Clear all oil passages of any obstructions and
ensure that all freeze plugs are secure.
Figure 5-9
Figure 5-9
1 – 65 mm (2.559 in.) Plug
2 – 40 mm (1.574 in.) Plug
3 – 40 mm (1.574 in.) Plug
4 – 16 mm (0.629 in.) Plug
5 – 35 mm (1.377 in.) Plug
6 – Flywheel End
7 – 40 mm (1.574 in.) Plug
8 – 16 mm (0.629 in.) Plug
9 – 40 mm (1.574 in.) Plug
Dye Penetrant Inspection Procedure
The dye penetrant inspection kit consists of an
aerosol cleaner, penetrant and developer.
Figure 5-10
Figure 5-10
NOTICE: Always read the instructions included with
the dye penetrant kit before use.
1. Spray the cleaner directly on the surface to
soften heavily soiled areas or wipe the area
with a cloth moistened with cleaner.
2. When the surface is clean and dry, spray the
penetrant on the suspect area so it is
completely covered and the penetrant liquid
shows a smooth surface tension. Use enough
penetrant to maintain a wet appearance for at
least 10 to 15 seconds. Do not disturb for 5 to
10 minutes.
3. Spray the developer on a clean shop towel and
remove any excess dye penetrant.
4. Spray a uniform thin film of developer on the
remaining penetrant and allow to develop for
several minutes. Cracks will appear as red dots
or a continuous red line on the surface being
inspected.
5. When finished, clean the surface with the
cleaner.
0005587
No.1
No.6
(1)
(2)
(3)
(5)
(6)
(7)
(8)
(9)
(4)
0005588

Yanmar 6LY3 series Specifications

General

Brand	Yanmar
Model	6LY3 series
Category	Engine
Language	English