Detroit Diesel MBE 4000 Service Manual page 327

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7. Check the idler and pump drive gears. Check their seats in the pump housing and face
plate. Listed in Table 3-1 are the acceptable limits.
Description
Diameter of Shaft Seat (in pump housing and face plate)
Diameter of Idler Gear and Pump Drive Gear Shaft
Clearance of Pump/Idler Gear to Walls of Pump Housing
Gear Backlash (clearance between gear cogs)
Table 3-1
[a] In the pump housing, measure the diameter of both gear seats, the idler gear seat
and the pump drive gear seat. If the measurements are not within acceptable limits,
replace the pump housing.
[b] Measure the diameter of both shaft seats in the face plate. If the measurements are
not within acceptable limits, replace the face plate.
[c] Measure the diameter of the pump drive gear shaft and the idler gear shaft. If the
measurements are not within acceptable limits, replace both gears as a set.
[d] Using a feeler gauge, measure the clearance between the gears and the pump housing
wall. If the measurements are not within acceptable limits, replace both gears as a set.
[e] Using a feeler gauge, measure gear backlash (the clearance between two adjacent
cogs on different gears). If the measurements are not within acceptable limits,
replace both gears as a set.
3.4.3
Assemble the oil pump unit as follows:
To avoid injury from burning, use lifting tools and
heat-resistant gloves when handling heated components.
1. Heat the drive wheel to approximately 176 F (80 C) in a hot water tank.
All information subject to change without notice.
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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Oil Pump Inspection Limits
Oil Pump Assembly
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mm (inch)
22.000-22.021 (0.8661-0.8670)
21.93-21.94 (0.8634-0.8638)
0.030-0.122 (0.0012-0.0048)
0.312-0.476 (0.0123-0.0187)
BURNS
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MBE 4000 SERVICE MANUAL
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3-17
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