Detroit Diesel 4000 Series, Service Manual, Page: 1278 / 2706

SERIES 4000 12/16V SERVICE MANUAL
3. Visually inspect the rotor assembly for damage.
[a] If rotor assembly is damaged, replace component.
[b] If rotor assembly is not damaged, continue inspection.
4. Visually inspect the centrifugal spindle and rotor assembly bearings for wear.
[a] If centrifugal spindle and rotor assembly bearings are worn, replace component
as necessary.
[b] If centrifugal spindle and rotor assembly bearings are not worn, continue inspection.
5. Disassemble and visually inspect the cut-off valve assembly.
[a] If the shuttle valve is damaged, replace centrifugal filter body assembly.
[b] If the shuttle valve is not damaged, continue inspection.
6. Visually inspect the centrifugal filter body O-ring for damage.
[a] If centrifugal filter body O-ring is damaged, replace component.
[b] If centrifugal filter body O-ring is not damaged, continue inspection.
7. Visually inspect and clean the O-ring groove on the rotor base.
Inspection and Repair of Oil Filter By-Pass Valve and Spring
Perform the following steps for inspection and repair of oil filter by-pass valve and spring.
1. Inspect opening pressure of the valve. The opening pressure should be 1.79 ±.28 bars
(25.96 ±4.06 lb/in.
2
).
[a] If opening pressure does not correspond to specified value, disassemble valve and
readjust by fitting appropriate adjusting shims until correct value is achieved.
[b] If opening pressure corresponds to specified value, continue inspection.
2. Clean components thoroughly.
3. Remove by-pass valve plug (4), spring and valve. Inspect threads of components for ease
of movement and signs of wear.
[a] If valve shows excessive signs of wear or does not show ease of movement, replace
components.
[b] If no signs of excessive wear or restrictive movement, continue inspection.
4. Ensure that oil chambers and oil passages are perfectly clean.
5. Inspect blanking plugs for leaks.
[a] If blanking plugs show leaks, replace as necessary.
[b] If blanking plugs do not show leaks, continue inspection.
6. Replace O-rings.
All information subject to change without notice.
C -1132
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