ML 430 (163.172) V8-4.3L (113.942) (2000)
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Black exhaust residue (Figure 4) found on heat shield directly above catalytic converter welds will also indicate a cracked weld.
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If visual inspection is inconclusive (no visual cracks or black exhaust residue found), proceed to subject B: Perform exhaust gas leak test using leak
detector.
B.
PERFORM EXHAUST GAS LEAK TEST USING LEAK DETECTOR
WARNING!
Exhaust system will become hot within a short time after starting engine causing injury to body parts that may come in contact with hot exhaust
components. Wear protective clothing as needed (e.g., gloves, long sleeve shirts).
Note:
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Engine must be cold when performing leak test or smaller cracks cannot be detected. Both catalytic converters must be tested before they become
warm.
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Suitable leak detecting equipment (shop equipment) must be used e.g.: