REPAIR INSTRUCTIONS, PART 1
Page 279
COOLING SYSTEM
COMPONENTS BENCH
PROCEDURES
Oil Cooler Reconditioning
[215 DW]
The plate-type oil cooler (Figure 310) on
current-production engines cannot be
disassembled. Should it fail, it is replaced as an
assembly.
310
Figure 310 — Plate-Type Oil Cooler Assembly
EGR Cooler Reconditioning
It is essential for coolant quality to be maintained
to keep the core from becoming blocked. Also,
prolonged idling can cause carbon buildup and
blockage with the core and should be avoided.
The EGR cooler cannot be disassembled and
reconditioned. However, welding is allowed to
repair some damage to the outer shell or bracket
so long as it does not involve the side tanks.
If damaged, do not weld repair the support
bracket to either side panel or the bottom of the
cooler. Do not weld anything to the header panel
on the cooler.
EGR COOLER CLEANING
Occasionally an EGR cooler may become
plugged with exhaust soot. This is usually caused
by idling the engine for prolonged periods of time
in cold weather. Should this occur, the EGR
cooler can be cleaned using the following
procedure.
The following procedure covers EGR coolers
which have been removed at engine overhaul.
However, this procedure could also be used to
clean an EGR cooler on the chassis by first
removing the piping from the cooler inlet and
outlet exhaust ports.
1. Install a vacuum cleaner bag over the outlet
port and secure with a suitable size tie wrap
or heavy rubber band.
2. Blow compressed shop air (no more than
25 psi) into the cooler inlet port while lightly
tapping on the front of the cooler to loosen
any lodged soot.
Be sure to reduce shop air pressure to 25 psi.
3. When all the soot has been cleaned from the
cooler, carefully remove the vacuum cleaner
bag from the outlet port.
4. Reinstall the piping if this procedure is
performed on the chassis.
Water Pump Reconditioning
[215 SW]
The ASET™ AC engine water pump cartridge is
not rebuildable in the field. If a pump failure
occurs, exchange it for a new or remanufactured
unit available through the MACK Parts System.
5-111.bk Page 279 Monday, July 10, 2006 2:26 PM
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