Cylinder Liner Wear • Ovality • Taper • Wear Rate • Ring End Gap • Groove Clearance • Blow-By Risk • Overhaul Planning
Marine Main Engine Cylinder Liner Wear, Piston Ring Clearance & Blow-By Tool
Turn cylinder-unit measurements into a structured condition screen. Simple mode checks worst liner wear, ovality, piston-ring end gap, groove clearance and observed blow-by. Advanced adds multi-height liner geometry, wear-rate trending, ring-by-ring condition, exhaust/compression deviation, drain-oil iron and cylinder-specific overhaul priorities.
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Fast cylinder-unit condition screen.
Use OEM measurements and limits from the engine manual. This tool does not create universal liner or piston-ring rejection criteria and does not calculate an actual blow-by mass-flow rate.
LinerWear & ovality margin
Ring packEnd-gap & groove margin
Blow-byObserved bypass risk screen
Quick Cylinder Measurement
mm.
mm, worst measured point.
mm, same inspection.
mm increase in diameter. OEM/user criterion.
mm measured / corrected per OEM procedure.
mm. OEM/user criterion.
mm.
mm. OEM/user criterion.
Inspection/monitoring observation, not calculated gas flow.
Engine / OEM Condition Limits
mm.
mm diameter increase.
mm.
mm.
mm / 1,000 h. Enter 0 to disable.
°C from active-cylinder average. 0 disables.
% from active-cylinder average. 0 disables.
mg/kg. User/OEM/fuel-specific criterion; 0 disables.
Cylinder Liner / Condition Register
Measure at consistent heights and directions per the engine manual. Previous wear and hours are used only to estimate wear rate.
| Use | Cylinder | Hours since previous | Previous max wear mm | Top F-A mm | Top P-S mm | Mid F-A mm | Mid P-S mm | Bottom F-A mm | Bottom P-S mm | Exhaust °C | Compression bar | Drain Fe mg/kg | Observed blow-by |
|---|
Piston Ring & Groove Register
Ring limits can differ by ring design, coating, gas-tight lock and engine type, so every ring row carries its own user-entered acceptance values.
| Use | Cylinder | Ring | End gap mm | Max gap mm | Groove axial clearance mm | Max groove clearance mm | Radial width mm | Minimum radial width mm | Condition |
|---|
Measurement / Inspection Checks
Condition boundary: this tool does not certify cylinder fitness, predict seizure, or calculate true combustion-gas leakage. OEM inspection procedures and limits remain controlling. Abnormal scuffing, broken/stuck rings, excessive gas bypass, rapid wear or unusual drain-oil debris can require action even when dimensional values remain inside entered limits.