Yanmar 4JH4E - Color Check Procedure

5. Inspection and servicing of basic engine parts
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5.1.3 Color check procedure
(1) Clean the area to be inspected
(2) Color check kit
The color check test kit consists of an aerosol
cleaner, penetrant and developer.
(3) Clean the area to be inspected with the
cleaner
Either spray the cleaner on directly and wipe,
or wipe the area with a cloth moistened with
cleaner.
(4) Spray on red penetrant
After cleaning, spray on the red penetrant and
allow 5-10 minutes for penetration. Spray on
more red penetrant if it dries before it has
been able to penetrate.
(5) Spray on developer
Remove any residual penetrant on the surface
after the penetrant has penetrated, and spray
on the surface after the penetrant has
penetrated, and spray on the developer. If
there are any cracks in the surface, red dots or
a red line will appear several minutes after the
developer dries.
Hold the developer 300-400 mm away from
the area the surface uniformly.
(6) Clean the surface with the cleaner.
Note:
Without fail, read the instructions for the
color check kit before use.