Cummins ISX11.9 CM2250 – Service Manual 011-009   Exhaust Restriction

• Perform a stationary regeneration to make sure the aftertreatment is clean prior to performing the exhaust restriction test. Refer to the OEM service manual.

Remove the aftertreatment diesel oxidation catalyst inlet temperature sensor. Refer to Procedure 019-449 in Section 19.

Install the pressure gauge adapter, Part Number 4918576.

Connect a manometer or pressure gauge, Part Number ST-1273, to the pressure gauge adapter.

Protect the hose from heat. Use a 305 mm [12 in] minimum length of metal tubing leading from the exhaust pipe connection.

NOTE: Disconnecting the aftertreatment diesel oxidation catalyst inlet temperature sensor will trigger Fault Code 3314. Do not troubleshoot this fault code during this exhaust restriction procedure.

NOTE: To achieve an accurate exhaust restriction test, be sure a stationary regeneration was performed prior to conducting the exhaust restriction test.

Operate the engine at rated rpm and load. Record the reading on the manometer.

If the exhaust restriction exceeds the specifications, inspect the exhaust piping for damage. Refer to the OEM service manual.

If the exhaust restriction exceeds the specifications, inspect the aftertreatment system for a plugged aftertreatment diesel particulate filter and/or a plugged aftertreatment diesel oxidation catalyst.

Extended engine operation with high exhaust restriction can lead to damaged turbocharger oil seals. Use the following procedure to inspect the turbocharger for progressive damage. Refer to Procedure 010-033 in Section 10.

• Remove the test equipment and install the aftertreatment diesel oxidation catalyst inlet temperature sensor. Refer to Procedure 019-449 in Section 19.
• Operate the engine and verify that all fault codes are inactive.