Camshaft Bearings - Main Engine and Propulsion

Camshaft bearings support and align the camshaft in marine diesel engines, maintaining the lubricating oil film under cyclic valve and fuel-injection loads. Bearings are engine-specific and commonly supplied as split, steel-backed white-metal shells or bronze bushes.

ProShipWorks provides end-to-end support to source and supply Camshaft Bearings for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.

Last updated: October 11, 2026

Product Information

Product Name	Camshaft Bearings
Product Category	Main Engine and Propulsion
Product Reference	13
Brands / Manufacturers	MAN Energy Solutions, Wärtsilä, Caterpillar MaK
Unit of Measure	Piece or Set

Key Features

Key Feature
1. Engine-specific journal dimensions and oil clearances
2. Low-friction plain-bearing construction
3. Steel-backed white-metal or bronze bearing material
4. Lubrication grooves and oil-feed holes
5. Replaceable shell or bush design

Applications of Camshaft Bearings

Application
1. Marine two-stroke main propulsion engines
2. Marine four-stroke propulsion engines
3. Shipboard auxiliary diesel engines

Models & Manufacturers

Model	Manufacturer
S50MC-C engine camshaft bearing	MAN Energy Solutions
Wärtsilä 46 engine camshaft bearing	Wärtsilä
MaK M32C engine camshaft bearing	Caterpillar Motoren

Technical Specifications

Model	Specification	Value	Unit
S50MC-C engine camshaft bearing	Configuration	Split plain-bearing shell; dimensions and clearance are engine-specific	—
Wärtsilä 46 engine camshaft bearing	Lubrication	Pressure-lubricated through the engine lubricating-oil system	—
MaK M32C engine camshaft bearing	Fit and clearance	Specified by engine serial number, bearing position and manufacturer service data	—

Standards, Certifications & Class Approval

Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.

Applicable Standards & Certification	Bearing terminology and material testing may reference ISO 4378 and ISO 4383. Final material, dimensions, oil clearance and acceptance criteria must comply with the engine manufacturer's drawings, service instructions and approved technical file.
Class Approval	Normally treated as an engine component rather than a separately type-approved product. For classed vessels, replacement parts may require OEM conformity, material traceability and acceptance by DNV, ABS, Lloyd's Register, Bureau Veritas or ClassNK, depending on vessel class and repair scope.

Installation, Maintenance & Safety Information

Installation Notes	Confirm engine model, serial number, camshaft section and bearing position. Clean the housing and oil passages, align oil holes, observe shell orientation, use specified fastener torque, and verify journal clearance, camshaft alignment and free rotation against OEM limits.
Maintenance Tips	Monitor lubricating-oil pressure, temperature and condition. During inspection, check for wiping, scoring, fatigue, corrosion, fretting, overheating and blocked oil grooves. Measure journal diameter and bearing clearance, and renew bearings outside OEM wear limits.
Safety Notes	Stop and isolate the engine, engage turning-gear interlocks, close starting-air supplies and follow lockout procedures. Support camshaft sections before removing bearing caps. Do not scrape or modify bearing surfaces unless expressly permitted by the engine manufacturer.