Detroit Diesel 4000 Series, Service Manual, Page: 1453 / 2706

SERIES 4000 12/16V SERVICE MANUAL
C 202.05.08 – INSPECTION AND REPAIR
Perform the following steps for inspection and repair of the high–temperature water pump:
1. Clean all components.
2. Using surface crack-testing method and red penetrant dye, inspect impeller for cracks.
[a] If cracks are found, repair or replace impeller.
[b] If no cracks are found, continue inspection.
3. Using the magnetic crack-testing method with fluorescent magnetic powder, inspect
pump shaft and gear for cracks.
[a] If pump shaft or gear is cracked, repair or replace components as necessary.
[b] If pump shaft or gear is not cracked, continue inspection.
4. Visually inspect sealing surfaces and/or annular grooves on elbow, housing, impeller and
inlet connection for wear, indentations and pitting.
[a] If sealing surfaces and/or annular grooves are worn, indented or pitted, rub down
with emery cloth or an oilstone.
[b] If damage is beyond repair, replace component.
[c] If sealing surfaces and/or annular grooves are not worn or damaged, continue
inspection.
5. Visually inspect elbow, housing, impeller and inlet adaptor for pitting.
[a] If pitting is over 1 mm in depth, replace component.
[b] If pitting is under 1 mm in depth, continue inspection.
To avoid an eye injury when using compressed air, wear
adequate eye protection (safety glasses or faceplate) and
do not exceed 276 kPa (40 lb/in.
2
) air pressure.
6. Visually inspect elbow, inlet adapter and housing for leaks with compressed air under
water.
[a] If elbow, inlet adaptor or housing show leaks, repair or replace components as
necessary.
[b] If elbow, inlet adaptor or housing do not show leaks, continue inspection.
NOTE:
Water temperature should be within a minimum of 30
C (86 F) to a maximum of 40 C
(104 F).
7. Visually inspect shaft for wear and damage.
All information subject to change without notice.
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C -1307