"> Duramax Marine / Wärtsilä (USA/Finland) Johnson Cutless Bearing
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Duramax Marine / Wärtsilä (USA/Finland)

Johnson Cutless Bearing

The Johnson Cutless Bearing is a water‑lubricated stern tube bearing that eliminates oil lubrication and seals by using nitrile rubber staves housed in a bronze (or non‑metallic) shell to support the propeller shaft.

Duramax Marine / Wärtsilä (USA/Finland) Johnson Cutless Bearing
Shaft diameter 25-750 mm
Capacity
Seawater lubricated
Medium

Components & Design

Component data being added…

Technical Data

type Water-Lubricated Stern Tube / Strut Bearing (Rubber)
variant count approx 3
period start year 1940
drive type Passive (seawater lubricated)
construction Nitrile rubber staves in bronze or non-metallic shell

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Common failures & inspection points

●Rubber stave wear from sand/debris ingestion
●Rubber delamination from age/UV exposure (above waterline bearings)
●Shell corrosion (bronze — dezincification in stagnant seawater)

Service & Maintenance

Bearing clearance measurement at drydock. Typical life 5-15 years depending on operating conditions. Replacement at drydock when clearance exceeds Class limits.

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Replacement Parts

Duramax Marine (Cleveland, OH, now part of Wärtsilä). Standard sizes widely stocked. Lead time: 1-3 weeks for standard, 4-8 weeks for custom sizes.
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Equipment Model #37801 · ✓ still in production