Sketch of Stuffing box:

Overhauling the stuffing box of a two-stroke engine without removing the piston

Safety Measures:

• Ensure the engine is shut down and properly immobilized.
• Engage turning gear to prevent any unintended movement.
• Open the indicator cocks
• Display appropriate safety signage to inform personnel of ongoing maintenance.
• Stop the lubrication oil pumps.
• Inform the bridge and obtain propeller clearance to ensure the vessel remains stationary during maintenance.
• Ensure all personnel are aware of the maintenance activities to prevent accidental interference.
• Open crankcase doors and ventilate the area to disperse any hazardous gases.
• Arrange adequate lighting, including explosion-proof lamps and torches, to ensure clear visibility.
• Wear appropriate safety gear, including gloves, safety glasses, and protective clothing, to safeguard against injuries.

Tools Required:

• Specialized stuffing box extraction tool or puller.
• Torque wrench for precise tightening.
• Feeler gauges to measure clearances.
• Cleaning brushes and lint-free cloths for cleaning components.
• New sealing rings and gaskets as per manufacturer specifications.
• Lubricants compatible with engine components.

Removing the stuffing box:

• Position a worktable around the piston rod, ensuring it is securely mounted.
• This setup allows for the loosening of the remaining screws in the stuffing box flange through designated holes in the worktable.
• Through the access holes in the worktable, carefully loosen and remove the screws securing the stuffing box flange.
• Ensure all fasteners are accounted for to prevent any from falling into the crankcase.
• With the flange screws removed, gently lower the stuffing box from its position on the piston rod.
• Exercise caution to avoid damaging the piston rod or adjacent components during removal.

Cleaning:

• Thoroughly clean the stuffing box components to remove any accumulated oil, carbon deposits, or debris.
• Examine the stuffing box for signs of wear, damage, or deformation.
• Check sealing rings, scraper rings, and other critical parts for integrity.

Replacement:

• Replace any worn or damaged components with new parts that meet manufacturer specifications.

Reinstallation:

• Carefully position the refurbished or new stuffing box onto the piston rod, aligning it correctly with the mounting flange.
• Reinsert and tighten the flange screws through the worktable access holes, ensuring even torque is applied to maintain proper sealing.
• Reconnect and fill the lubrication system, checking for proper flow to the stuffing box.
• Manually rotate the engine using the turning gear to verify the smooth operation of the piston rod through the stuffing box.
• Inspect for any signs of oil or air leaks around the stuffing box area, addressing any issues before returning the engine to service.