Service Manual

ISB, ISBe and QSB (Common Rail [...] EGR Valve
Section 11 - Exhaust System - Group 11 Page 11-21
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Clean and Inspect for Reuse
Clean the EGR valve marmon flange and the mounting
surfaces of the EGR valve with a Scotch-Brite™ pad.
Clean the exhaust manifold with a Scotch-Brite™ pad.
Inspect the EGR valve for cracks, leaks, corrosion,
restriction, and debris.
Inspect the exhaust transfer tube for cracks, corrosion,
and plugging.