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Sulzer

5RTA62

Name: Sulzer 5RTA62
Brand: Sulzer
SKU: OSE-38628

The Sulzer 5RTA62 is a low‑speed, two‑stroke marine diesel engine with five cylinders (620 mm bore, 1976 mm stroke) delivering up to 10 100 kW at 113 rpm, primarily used as main propulsion for medium‑size vessels.

10100.0 kW

Power

Engine Specifications

Cylinders

620 mm

Bore

1976 mm

Stroke

10,100 kW

MCR Power

113.0 rpm

MCR RPM

2-stroke

Stroke Type

Family: Sulzer RTA · Tier: IMO Tier I · Fuel: HFO, MDO

Inspector Detail ✓ verified

▸

Designation decoded

5RTA62: 5-Zylinder Sulzer RTA-Baureihe, 620 mm Bohrung, Standard-Hub-Ausfuehrung. Reversible Turbocharged type A (Kreuzkopfmotor) mit konventioneller Nockenwellensteuerung.

Background

The RTA62 is a conventional two-stroke crosshead engine with 620 mm bore and 1976 mm stroke. As a standard version (without T, U or B suffix) it offers a balanced stroke-bore ratio of 3.19. The engine belongs to the Sulzer RTA family with gear-driven camshaft, VIT (Variable Injection Timing), Pulse Lubricating System and CLU (Cylinder Liner Unit). With 5 cylinders there is inherently elevated torsion vibration risk. The 620 mm bore class represents a medium-sized slow-speed engine, suitable for bulk carriers and smaller container/tanker ships.

Calculated metrics

Stroke To Bore Ratio

3.19

Inspector checklist

Cylinders and cylinder liners (CLU)

Document CLU condition and cylinder liner wear at 4 measurement planes
Check running surface for scoring, corrosion and uniform wear
Inspect cooling water spaces for leaks and deposits
Laufbuchsendichtungen auf Zustand pruefen

Fuel injection and VIT

Inspect VIT mechanism for correct function and setting
Test fuel injection nozzles for opening pressure and spray pattern
Check fuel pump delivery and uniformity
Hochdruckleitungen auf Materialermuedung inspizieren

Crosshead and running gear

Kreuzkopflager-Spiel messen (Sulzer-Bauart-spezifisch)
Inspect crosshead pin and sliding surfaces for damage
Pleuelstangen-Schraubverbindungen pruefen
Piston rod stuffing box inspect for leakage and wear

Camshaft and gear drive

Check gear drive for backlash and surface condition
Nockenwellenlager-Zustand kontrollieren
Nockenprofile auf Verschleiss untersuchen
Schmieroelversorgung sicherstellen

Torsionsschwingungsdaempfer

Daempfer-Zustand gruendlich pruefen (5-Zylinder-Risiko)
Check silicone oil fill level and viscosity
Inspect housing for cracks and leaks
Betriebstemperatur mit Grenzwerten vergleichen

Exhaust valves and cylinder covers

Inspect valve seat and spindle for burn-off and corrosion
Ventildrehvorrichtung auf Funktion testen
Zylinderdeckel-Kuehlbohrungen auf Durchgaengigkeit pruefen
Dichtflaechen kontrollieren

Logbook reference values

Parameter	Expected	Deviation means
Zuenddruckspitze (Pmax)	Innerhalb +/- 3 bar vom Mittelwert aller Zylinder	Injection or compression differences—check VIT and injection components
Exhaust gas temperature per cylinder	340-420 Grad C, Spreizung max. 30 Grad C	Erhoehte Einzelwerte deuten auf Verbrennungsstoerung hin
Kuehlwassertemperatur Laufbuchse	Eintritt 75-85 Grad C, Delta-T 8-12 Grad C	Auffaelliges Delta-T weist auf Kuehlsystemprobleme hin
Zylinderschmieroel-Feedrate	0.7-1.2 g/kWh	Evaluate deviation at S/B 3.19—standard stroke requires standard feedrate
Spuelluftdruck	Gemaess Herstellerkennlinie	Underpressure at S/B 3.19 less critical than at long stroke, but still to be corrected
Turbolader-Drehzahl	Gemaess Kennfeld fuer Lastpunkt	Deviation indicates turbocharger fouling or damage

Common Failure Modes

Piston ring wear and fracture

Symptoms: ['Blow-by-Erhoehung im Spuelluftkanal', 'Steigende Abgastemperatur', 'Kompressionsdruckverlust']

Causes: Langzeitbetrieb ohne Revision, Unzureichende Zylinderschmierung, Thermische Ueberlastung

Preventive: Regular scavenge air duct inspection, renew piston rings per manufacturer interval, optimize pulse lubricating system.

Laufbuchsen-Kaltkorrosion

Symptoms: ['Saeurebedingter Materialabtrag', 'Rauhes Verschleissbild', 'Erhoehter Schmieroel-Verbrauch']

Causes: Kuehlwassertemperatur zu niedrig, BN number of cylinder oil not adapted to sulfur content, Teillastbetrieb mit kalten Laufbuchsen

Preventive: Maintain cooling water temperature >75 degrees C, adapt BN number, observe cooling water temperature control at part load.

Kreuzkopflager-Schaden

Symptoms: ['Lagertemperatur-Erhoehung', 'Metallpartikel im Schmieroel', 'Klopfgeraeusche']

Causes: Oelverunreinigung, Lagerspiel ausserhalb Toleranz, Kolbenstangen-Fehlausrichtung

Preventive: Schmieroelanalyse regelmaessig, Lagerspiel kontrollieren, Fluchtungsmessung durchfuehren.

5-Zylinder-Torsionsschwingungsschaden

Symptoms: ['Erhoehte Vibrationen', 'Ermuedungsrisse an Kurbelwelle', 'Schwingungsdaempfer-Ueberhitzung']

Causes: Inherently unfavorable mass balancing at 5 cylinders, Defekter Schwingungsdaempfer, Barred-Speed-Range-Verletzung

Preventive: Maintain vibration damper according to specification, comply with barred speed range, vibration monitoring.

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Related components

Turbocharger - bearing and cleanliness condition Scavenge air filter and scavenge air duct Exhaust gas boiler and economizer Fuel preparation and preheating Shaft line and thrust bearing Starting air valves and control air Main bearing and crankshaft (deflection measurement) Torsionsschwingungsdaempfer

Classification & regulatory

Crankshaft deflection measurement at regular intervals according to classification. Observe 5-cylinder-specific requirements for vibration monitoring. Comply with NOx Technical Code - do not change VIT and injection parameters without class approval. Observe MARPOL Annex VI fuel requirements.

Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.

Other Cylinder Configurations 50

Components & Design

Component data being added…

Technical Data

unified from engine model True

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Manuals

operating
Sulzer RTA Operating Manual
Wärtsilä Switzerland (historical Sulzer)
maintenance
Sulzer RTA Maintenance Manual
Wärtsilä Switzerland (historical Sulzer)
spare_parts
Sulzer RTA Spare Parts Catalogue
Wärtsilä Switzerland (historical Sulzer)

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Equipment Model #38628 · ✓ still in production