Mack E7, Service Manual, Page: 269 / 303

200 ENGINE INSTALLATION & TESTING
Page 8-7
CMCAC Pressure Test
1. Remove air ducting from core.
2. Plug core inlet opening.
3. Insert a plug with an air-line adapter in core
outlet opening.
4. Connect a safety chain to both plugs. Use
air charge cooler pressure fixture J 41473 on
coolers with flange connections.
Stand clear of plug area when system is
pressurized.
5. When plugs are secured, attach an air line
(fitted to a pressure regulator and gauge) to
air-line adapter in core outlet opening.
6. Pressurize system to 30 psi (207 kPa).
7. Shut off air source. Pressure should not drop
more than 5 psi (35 kPa) within 15 seconds.
Repair or replace core if pressure drop
exceeds specification.
8. Carefully release pressure in system.
9. After repairing or replacing core, reconnect
ducting. Torque clamp nuts until clamp
spring is fully compressed.
When the spring is fully compressed, torque on
the nut is generally between 40–55 lb-in
(4.5–6.2 N•m).
Figure 8-1 — CMCAC Pressure Test
1. Core inlet
2. Core outlet
3. Plug (part of J 41473)
4. Safety chain
5. Air pressure regulator and gauge (J 41473)
5-101.bk Page 7 Friday, March 17, 2006 11:05 AM