Detroit Diesel 60 Series Operator's Manual page 44

A method of determining when filters
are plugged to the extent that they
should be changed is based on the fuel
pressure at the cylinder head fuel inlet fit-
ting and the inlet restriction at the fuel
pump. In a clean system, the maximum
pump inlet restriction should not exceed
6 inches of mercury (20.3 kPa) and must
not exceed 12 inches of mercury (41
kPa) with a dirty system.
At normal operating speeds and with
the standard .080" restriction fittings, the
fuel pressure is 375-483 kPa (55-70 psi).
Change the fuel filters whenever the inlet
restriction at the fuel pump reaches 12
inches of mercury (41 kPa) at normal
operating speeds and whenever the fuel
pressure at the inlet fitting falls to the
minimum fuel pressure of 6 inches of
mercury (20.3 kPa).
Item 13 — Water Pump and Coolant
Inhibitor Element
The water pump drain hole should be
inspected every 6 months to make sure
it is open. A small chemical build up or
streaking at the drain hole may occur.
This is not an indication of a defective
water pump or seal. Remove the build-
up with a mild detergent cleaner and a
brush. If coolant does not leak from the
drain hole under normal operating con-
ditions, do not replace the water pump.
If the cooling system is protected by a
coolant inhibitor element (see Figure 17),
the coolant must be tested at required
intervals and the element replaced, if
required. Refer to "Coolant Test
Intervals" chart and "Inhibitor Test
Procedures" under How to Select
Coolant for required test intervals and
inhibitor levels. Use the coolant element
part number listed in Table 24 in the
Specifications section. The valves
mounted on the adapter head must be
opened after the element is replaced.
Figure 17. Coolant Inhibitor Element
Item 14 — Cranking Motor
For information, contact an authorized
®
Delco-Remy or Bosch
Center, depending on manufacturer.
Item 15 — Air System
All the connections in the air system
should be checked to make sure they
are tight and leak free. Check all hoses
and ducting for punctures, deterioration
or other damage and replace, if neces-
sary.
Item 16 — Exhaust System
Have the exhaust manifold retaining
bolts and other connections checked for
tightness. Also have the exhaust pipe
rain cap checked for proper operation, if
so equipped.
34
®
Service