residual surface penetrant has been re-
moved. Shake developer thoroughly
until agitator rattles. Invert spray can
and spray short bursts to clear valve.
Then spray this developer film evenly
over the test area being inspected. Al-
low developer film to dry completely
before inspecting. Recommended devel-
o p i n g time is 5 to 15 minutes.
The above four methods provide basic
instructions. Specific details should be
obtained from the supplier of the equip-
ment or material.
PRESSURE CHECK METHOD. Pressure
check the cylinder head as follows:
A. To seal off the water holes in the cyl-
inder head, assemble tool set J 28454
1)
Install the rubber stoppers on the
bridge.
a) L a r g e s t o p p e r s a r e i n s t a l l e d o n
the long center bridge feet op-
posite the notch and on the
end bridge feet closest to-
Ion
Prepared for Pressure Test
gether.
FLUORESCENT MAGNETIC PARTICLE
b . Small stoppers are installed op-
METHOD. This method is similar to the
posite the large stoppers on
magnetic particle method, but is more
center bridge and end bridge
sensitive since it uses fluorescent mag-
feet and on all short bridges.
netic ,particles which glow under a "Black
Light". Very fine cracks, especially on
2) I n s t a l l t h e n e c e s s a r y p a r t s ,
discolored or dark surfaces, that may be
loosely, on the cylinder head.
missed using the Magnetic Particle Meth-
Light".
be
disclosed
under
the
Black
3) T i g h t e n t h e h o l d d o w n b o l t s u n t i l
the stoppers start to distort. A 5
lb-ft (7 Nm) torque is usually suf-
FLUORESCENT PENETRANT METHOD.
ficient.
A highly fluorescent liquid penetrant is
applied to the area in question.
Then
NOTE
the excess penetrant is wiped off the
surface and the part is dried. A devel-
Do not overtighten the hold down
oping powder is then applied which helps
bolts. The rubber stoppers could
to draw the penetrant out of the flaws by
distort enough to seal both the in-
capillary action. Inspection to find the
ner and outer diameter of the wa-
crack is carried out using a "Black
ter nozzle. If the outer diameter
Light".
is sealed, a leak from the outer di-
ameter would not be detected.
NON-FLUORESCENT PENETRANT METH-
OD. The test area being inspected is
sprayed with "Spotcheck" or Dye Check.
6. Install the air supply plate.
Allow one to thirty minutes to dry. Re-
move the excess surface penetrant with
NOTE
clean
cloths
premoisened
with
cleaner/remover. DO NOT flush surface
Do not hook onto the pressure
with cleaner/remover because this will
checking tool, or any part of it, to
impair sensitivity. Repeat this proce-
move the cylinder from one location
dure with additional wipings until
E n g i n e (Less Major Assemblies) 11B-19