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SERIES 4000 12/16V SERVICE MANUAL
Oil Leaking From The Seals
Perform the following corrective actions to resolve oil leaking from the seals:
NOTE:
Leaking hose connections can often appear to be seal leaks. Check carefully. Always
clean the oily area well, to verify the actual source of the leak.
NOTE:
Oil seal design requires that a small amount of oil must lubricate the seal lip. This oil
often accumulates and eventually weeps from the seal area. A small amount of oil
weep is to be considered normal if, after thoroughly cleaning the surface, the oil track
does not reach the O.D. of the pulley within one hour of operation. Clean the wet area
thoroughly. Continue to operate the fan clutch until a clear determination can be made
that a normal weep is not being mistaken for an actual leak. If it is determined a leak is
occurring, repair the fan clutch.
1. Oil drain line may be too small or restricted.
Remove restriction. A restricted drain line can cause excessive pressure inside the fan
clutch, causing seal leaks. Go to step 2 for a further probable cause.
2. Orifice may have been left out of the fan clutch.
(Some fan clutches operate without an orifice or have the orifice designed into internal
passageways of the fan clutch. Refer to a parts manual to determine if a separate orifice
plug is used.) Install the correct orifice if the fan clutch does not have the correct one.
When the proper orifice fitting is installed in the OIL IN port, the leak may cease. If the
leak continues, repair the fan clutch. Go to step 3 for a further probable cause.
3. Front or rear oil seals may be damaged.
Repair the fan clutch correctly, using tools and procedures as specified. Go to step 4 for a
further probable cause.
4. Oil may be leaking under the wear sleeve.
Repair the fan clutch correctly, using tools and procedures as specified. Go to step 5 for a
further probable cause.
5. Belt tension may be excessive.
Check to ensure belt tensioning mechanism is not bound up, misaligned, or creating excess
tension. Adjust belt tension to proper engine or vehicle manufacturer’s specifications. If
belt tension is correct and seals continue to leak, repair the fan clutch.
All information subject to change without notice.
E -14
Copyright © DETROIT DIESEL CORPORATION
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Страница 2631: ...E TROUBLESHOOTING Section Page E 010 MECHANICAL TROUBLESHOOTING E 3 E 020 TESTING E 45 ...
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Страница 2681: ...F PREVENTIVE MAINTENANCE Section Page F 010 Rockford Fan Clutch F 3 ...
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