Piston Rod Stuffing Boxes - Main Engine and Propulsion

Piston rod stuffing boxes seal the crankcase from the scavenge space in low-speed two-stroke crosshead marine engines. Segmented sealing and scraper rings remove cylinder oil and contaminants from the piston rod while controlling gas and oil leakage.

ProShipWorks provides end-to-end support to source and supply Piston Rod Stuffing Boxes for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.

Last updated: October 11, 2026

Product Information

Product Name	Piston Rod Stuffing Boxes
Product Category	Main Engine and Propulsion
Product Reference	314
Brands / Manufacturers	MAN Energy Solutions, WinGD, Japan Engine Corporation
Unit of Measure	Set

Key Features

Key Feature
1. Segmented sealing and oil-scraper ring packs
2. Separates scavenge space from crankcase
3. Returns scraped cylinder oil through drain passages
4. Spring-loaded rings accommodate wear and thermal movement
5. Split housing permits servicing around the piston rod

Applications of Piston Rod Stuffing Boxes

Application
1. Low-speed two-stroke marine main propulsion engines
2. Crosshead diesel engine crankcase and scavenge-space sealing
3. OEM engine overhaul and piston rod stuffing-box replacement

Models & Manufacturers

Model	Manufacturer
MAN B&W MC/MC-C series piston rod stuffing box	MAN Energy Solutions
MAN B&W ME/ME-C series piston rod stuffing box	MAN Energy Solutions
RTA and RT-flex series piston rod stuffing box	WinGD
X and X-DF series piston rod stuffing box	WinGD
UE series piston rod stuffing box	Japan Engine Corporation

Technical Specifications

Model	Specification	Value	Unit
MAN B&W MC/MC-C series	Engine type	Low-speed two-stroke crosshead engine	—
MAN B&W ME/ME-C series	Ring arrangement	OEM-specified segmented sealing and scraper ring packs	—
RTA and RT-flex series	Construction	Split housing with spring-loaded segmented rings	—
X and X-DF series	Sizing basis	Engine type, cylinder bore, piston rod diameter and build specification	—
UE series	Primary function	Gas sealing and piston rod oil scraping	—

Standards, Certifications & Class Approval

Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.

Applicable Standards & Certification	No universal standalone dimensional standard applies. Stuffing boxes are manufactured to the engine OEM's drawings, material specifications and service limits, with applicable marine machinery and SOLAS safety requirements.
Class Approval	Normally accepted as part of the class-approved engine design rather than separately type-approved. Relevant engine installations may be surveyed by DNV, ABS, Lloyd's Register, Bureau Veritas, ClassNK, RINA or other flag-recognized societies.

Installation, Maintenance & Safety Information

Installation Notes	Verify engine type, cylinder number, piston rod diameter and OEM part numbers. Install ring segments, springs and drain components in the specified order and orientation. Check rod condition, ring clearances, housing alignment and unobstructed drain passages using the engine manual.
Maintenance Tips	Monitor stuffing-box drains and crankcase contamination. During overhaul, clean the housing and drains; inspect sealing and scraper rings, springs and piston rod surface for wear, scoring, deposits or breakage. Measure clearances to OEM limits and replace worn components as matched sets.
Safety Notes	Stop and isolate the engine, engage the turning-gear interlock and follow confined-space and crankcase-entry procedures. Allow components to cool and relieve pressure before opening. Use approved lifting equipment and protect the polished piston rod from impact or abrasive damage.