- Inspect the vibration damper.
- Engine supports
- Driven equipment
- Engine misfiring
- Running rough
Check the vibration damper for damage. Install a new vibration damper, if necessary. Inspect the mounting bolts for damage and/or for wear. Replace any damaged bolts. Refer to the Disassembly and Assembly manual.
Inspect the mounts and the brackets while you run the engine through the speed range. Look for mounts and brackets that are loose and/or broken. Tighten all of the mounting bolts. If necessary, replace any damaged components. Check the alignment of the following before operating the engine under load for any length of time:
- Crankshaft deflection
Inspect the mounting bolts for the driven equipment. Inspect the alignment and the balance of the driven equipment. Inspect the coupling. If necessary, disconnect the driven equipment and test the engine.
Refer to Troubleshooting, “Engine Misfires, Runs Rough or Is Unstable”.