Detroit Diesel 4000 Series, Service Manual, Page: 2669 / 2706

SERIES 4000 12/16V SERVICE MANUAL
E 012.05 AD – ENGINE COOLANT PUMP LEAKING AT WEEP HOLE
Start with the first probable cause for engine coolant pump leaking at the weep hole
listed in Table 29, perform the check and take the suggested remedial action. If the problem
persists, go to the next probable cause, perform the check, etc., until troubleshooting is complete.
Probable Causes Check Remedial Action
Radial lip oil seal leaking
Rotary seal leaking
For oil discharge
Engine coolant discharge
Replace sealing ring
Replace slip ring; replace engine
coolant pump if necessary
Table 29 Engine Coolant Pump Leaking at Weep Hole
E 012.05 AE – PREHEAT TEMPERATURE TOO LOW
Start with the first probable cause for preheat temperature too low listed in Table 30, perform the
check and take the suggested remedial action. If the problem persists, go to the next probable
cause, perform the check, etc., until troubleshooting is complete.
Probable Causes Check Remedial Action
Power supply for preheater Power supply available Provide power supply
Preheater not working Preheater switch on Check OEM instructions
Table 30 Preheat Temperature Too Low
All information subject to change without notice.
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