Crescent (NV / Monark-Crescent) NV Marin (Nyckelpigan)

• 48 cm³
• 1954–1979

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Troubleshooting

Starting problems

• Boat engine won't start after the winter
• Boat engine won't start when warm

Runs rough, stalls or loses power

• Boat engine dies at idle or when shifted into gear
• Boat engine hesitates or dies on acceleration
• Boat engine stops after a while

Smoke and exhaust

• The boat engine smokes blue – burning oil
• White smoke from the boat engine exhaust

Oil, water and fuel

• Petrol smell in the boat – fuel leaking from the engine
• Water in the fuel or tank of the boat engine
• Water in the engine oil – the oil is grey or milky

Electrics, alarms and fault codes

• Battery not charging – charge warning light is on
• The alarm is sounding – what do the warning lights mean?
• Oil pressure alarm on the boat engine – low oil pressure

Drive, gearbox and trim

• Trim not working – the drive won't go up or down
• Gear will not engage or jumps out

Outboard

• The outboard only runs on choke or dies at idle
• Outboard not cooling – no tell-tale stream
• The outboard won't start
• The outboard loses power or won't reach full revs
• Water in the outboard's gearcase oil

Manuals

• Archives

  Swedish Outboard Motors – NV/Crescent history ↗ (external link)

  History and photos; no manuals.

• Archives

  Cremo Boats – history of Monark and Crescent ↗ (external link)

  Old catalogues and owner's manuals, mainly for Crescent and Monark boats.

Listings for NV Marin (Nyckelpigan)

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Related models

NV Skipper

Outboard

1954

→

Crescent Marin 4 hk

Outboard

4 hp

→

Service guides

Replacing the impeller →Winterize a boat engine →

Frequently asked questions about NV Marin (Nyckelpigan)

Where can I find the owner's manual for NV Marin (Nyckelpigan)?

Links to owner's manuals and workshop manuals are available under Manuals.

Sources

• Swedish Outboard Motors: Nymanbolagen, NV ↗ (external link)
• Wikipedia: Crescent ↗ (external link)
• Swedish Outboard Motors: Volvo Penta (Monark-Crescent history) ↗ (external link)
• Swedish Outboard Motors: Electrolux ↗ (external link)