User Manual

SERIES 50 OPERATOR'S GUIDE
Item 24 – Thermostats an d 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 moun ted (in the engine
rocker cover) crankcase breather
assembly should be removed and
the steel mesh pa d 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
ofservice.SeeFigure19).
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
Item 26 – Engine Tune-Up
There is no scheduled interval for
performing an engine tune-up.
However, the valve lash and injector
heights must be measured and, if
necessary, adjusted at the initial
interval listed in Table 19. Once the
initial measurements/adjustments
have been made, an y adjustments
beyond this point should be made only
as required to maintain satisfactory
engine performance.
Item 27 – Vibration Damper
The viscou s vibration damper should
be inspected periodically and replaced
if dented or leaking. See Figure 21.
All information subject to change without notice. (Rev. 01/04) 81
DDC-SVC-MAN-0058 Copyright © 2004 DE TROIT DIESEL CORPORATION