TM 5-3805-262-203-6. EXHAUST SYSTEM TROUBLESHOOTING (CONT) MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONEXCESSIVE EXHAUST NOISE (Cont).S t e p 2 . ( C o n t ) .a. If air bubbles are seen, replace gasket (page 4-66).b. If air bubbles are not seen, go to step 3 below.Step 3.Squirt a small amount of oil on exhaust manifold in areas where ex-haust manifold is mounted to cylinder heads. With engine idling,check if air bubbles can be seen,indicating gaskets are damaged.a. If air bubbles are seen, remove exhaust manifold and replacegaskets (page 4-7).b. If air bubbles are not seen, go to step 4Step 4.Check exhaust manifold for cracks and holes.Replace damaged exhaust manifold (page 4-7).below.3-52
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