Work Scope, Man-Hours, Parts, Specialists, Workforce Capacity, Critical Path, Off-Hire & Replacement Comparison

Marine Engine Overhaul Cost & Downtime Tool

Build a preliminary engine-overhaul budget without hiding the commercial cost of lost operating time. Simple mode converts total man-hours and available workforce into a downtime screen. Advanced mode schedules work packages by phase, applies shared-workforce constraints, separates inspection-dependent parts from base scope and compares the resulting exposure with an optional engine-replacement case.

Data type
Currency
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Need phased work packages, inspection-dependent parts and an overhaul vs replacement screen? Click Advanced above.Advanced allows jobs in the same phase to overlap while still respecting both the shared workforce pool and the maximum technicians practical on each package.

Fast Overhaul Cost & Downtime Screen

Exactly 10 primary inputs. Simple assumes the entire entered overhaul scope is vessel-critical and uses one shared workforce pool across all engines in scope.

Total direct labor-hours per engine.
Average technicians simultaneously productive across the project.
Selected currency/man-hour.
% of modeled direct overhaul cost.
Selected currency/day of lost contribution or off-hire exposure.

Project Workforce & Cost Basis

Shared across all work packages running in the same phase.
Selected currency/man-hour.
% of base parts value reserved for findings identified during inspection.
Selected currency.
% applied after inspection-dependent parts allowance.
days added outside work-package phases.
Selected currency/day.

Overhaul Work Packages

Packages with the same phase number are modeled as parallel activities. A phase cannot finish faster than its total man-hours divided by the shared workforce, any package-specific technician limit, or an entered calendar-day floor. Work-package names are excluded from Tool Data.

Work packagePhaseUnitsMH / unitMax techs on packageParts / unitSpecialist / workshopCalendar floor days

Optional Replacement Comparison

All-in selected currency before commercial downtime. Enter 0 to disable comparison.
days.

Overhaul Planning Readiness

Budget / schedule screen only: this tool does not define an engine's required overhaul interval, mandatory scope, component rejection criteria, class-survey scope, safe disassembly method or return-to-service acceptance. Overhaul intervals and component life are engine-model and condition dependent. Use current OEM manuals/service letters, vessel maintenance history, condition evidence, class/flag requirements and approved work procedures.
Maintenance-planning context: MAN Energy Solutions publishes engine-specific guiding overhaul intervals and notes that condition-based strategies can support different overhaul timing where properly documented. Wärtsilä's current overhaul packages combine parts, field/workshop work and specialist support, and the company recommends arranging planned packages well ahead of the maintenance window; it also offers inspection-dependent parts support for findings discovered during overhaul. These are examples of why the calculator keeps base scope, inspection findings, specialist cost and schedule risk separate rather than assuming one universal overhaul interval or flat cost. MAN Guiding Overhaul Intervals · Wärtsilä Overhaul Packages · Wärtsilä Workshop Services
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