SERIES 50 OPERATOR'S GUIDE
Item 23 – Fan Hub
If the fan bearing hub assembly has a
grease fitting, use a hand grease gun
to lubricate the bearings with one shot
of quality lithium-base, multi-purpose
grease every 100,000 miles (160,000
km) for vehicle engines or 1,000 hours
for non-vehicle engines. Care should
be taken not to overfill the bearing
housing.
Item 24 – Thermostats and Seals
Replace the thermostats and seals
every 240,000 miles (384,000 km)
on vehicle engines. On non-vehicle
engines, replace the thermostats and
seals every 4,000 hours or 24 months,
whichever comes first.
Item 25 – Crankcase Breather
The internally mounted (in the engine
rocker cover) crankcase breather
assembly
should be removed and
the steel mesh pad washed in clean
fuel oil
every 100,000 to 120,000
miles (160,000 to 192,000 km) on
vehicle engines or every 1,000 hours
of operation on non-vehicle engines.
This cleaning period may be reduced
or lengthened according to the severity
of service. See Figure 19).
Figure 19 Internal (in Rocker
Cover) Breather
Location
The rocker cover-mounted breather
assembly (part number 23512984)
used in the closed crankcase breather
system
should be replaced
every 4000
operating hours. It is not reusable and
no attempt should be made to clean or
reuse it. See Figure 20.
Figure 20 Rocker Cover-Mounted
Breather
All information subject to change without notice.
(Rev. 01/ 04)
81
6SE550 0401
Copyright © 2004 DETROIT DIESEL CORPORATION
