ISBe/ISB Series Engines – Engine Noise Excessive

Fan drive belt is loose, tight, or notin alignment

Check the fan drive belt. Refer to Section 6.

Fan is loose, damaged, or notbalanced

Check the fan. Refer to Section 3.

Fan clutch, hydraulic pump, or freon compressor noise is excessive

Isolate each component, and check for noise. Refer to the OEM service manual.

Alternator noise is excessive

Refer to the manufacturer’s instruction manual.

Air intake or exhaust leaks

Check for loose or damaged piping connections and missing pipe plugs. Check the turbocharger and exhaust manifold mounting. Refer to Section 3.

Air intake or exhaust piping is contacting the chassis or cab

Inspect the air piping, chassis, and cab for contact points. Refer to the OEM service manual.

Lubricating oil level is below specification

Check the oil level. Verify the dipstick calibration and the oil pan capacity. Fill the system to the specified level. Refer to Section 5.

Lubricating oil is thin or diluted

Refer to Section V.

Vibration damper is damaged

Inspect the vibration damper. Refer to Section 7.

Coolant temperature is above specification

Refer to the Coolant Temperature is Above Normal – Sudden Overheatsymptom tree.

Engine mounts are worn, damaged, or notcorrect

Inspect the engine mounts. Refer to the OEM service manual.

Air compressor noise is excessive

Refer to Section 4.