Crankshaft Thrust Washer – Working, Functions, & Replacement

A crankshaft thrust washer (or the thrust plates/bearings) is often considered minor marine spare parts. These small disk-like structures protect the crankshaft from damage during main engine operation. The lubricated bearings prevent shaft movement forward and backward when running the engine. It is essential to eliminate frictional wearing between the moving and static parts. The marine crankshaft thrust bearings differ in type and size depending on the crankshaft model. Herein, we present a definitive guide to the importance, uses, and maintenance of crankshaft thrust washers applicable for watercraft of all styles and dimensions.

What is Crankshaft Thrust Washers in Marine Vessels

A thrust bearing or washer is a circular/disk-shaped component offering diverse benefits. It protects the engine and crankshaft during operation under stringent environments. The ultra-smooth finish allows effortless rotation and prevents friction between the static and rotating crank parts. When working under intense pressure and vibration, these thick disks can absorb high loads.

Location

The placement and location of the thrust bearings on a marine crankshaft may vary depending on the engine model, engine block design, and other aspects. Usually, these washers are axially present within the crankcase or on the thrust block at the rear end/center of the main crankshaft bearings. In marine diesel generators, these bearings are present between the engine block and the crankshaft.

Materials

The marine crankshaft thrust washer material depends on the product model, equipment size, supported engine load, and other factors. These parts feature heavy-duty metals, ensuring uninterrupted performance in saltwater and high-pressure operations. These thrust plates are typically made of bronze, steel, aluminum, or composite materials.

How Marine Crankshaft Thrust Bearings Work

Depending on the engine type, a crankshaft may have a stationary or moveable thrust plate. It absorbs the excess load to prevent the shaft from moving back due to heavy thrust from the propellers or moving forward due to pressure and vibration when the engine is running.

Functions of Crankshaft Thrust Bearings

Despite the miniature size, these unsung heroes play several crucial roles in the safety and functionality of marine components around the engine block. Here is an overview of the key functions and uses of marine crankshaft thrust washers in vessels of all types and sizes:

Support the Crankshaft Alignment

Crankshaft thrust bearings prevent the shaft from axial (backward) and forward movement due to forces from the propeller or the main engine. The shock absorption properties of these bearings maintain the precise crankshaft alignment.

Protect the Main Engine Components

Thrust washers between the engine block and the crankshaft prevent frictional wear and tear of the crucial equipment components.

Resist Wearing and Friction due to Crankshaft Movement

These plates block the mobility along the thrust shaft's axis. The smooth surfaces allow seamless movement of the adjacent parts to minimize friction and overheating.

Consistently Spreads Engine Oil Along the Shaft

The thrust plates have small holes to allow the flow of lubricating engine oil through all parts of the shaft. Accurate lube oil distribution eliminates extra heat and prevents friction between the stationary and moving crank parts.

Distributes Load Evenly Along the Crankshaft

Lubricated thrust bearings absorb the extra load from the engine to enhance the operation and prevent heating. Replacing these washers when required contributes to extending the component lifecycle in the engine room.

Buy OEM Perkins Thrust Washers and Combo Kits

Availing of exact part numbers for marine crankshaft thrust washers is no longer daunting for vessel owners. Alfa Marine Spare Parts is one of the leading providers of Perkins crankshaft spare parts, including genuine thrust bearings. We have enlisted the top-selling bearing items from the brand herein to save you time when searching for products through our extensive product gallery. Moreover, the description offers additional information about the compatible crank models to ease your search. KRP3206 – 2506TAG3 / 2506C / 2506TAG4 (STANDARD) T409186 – 1204E-E44TA / 1204F-E44TA / 1206E-E70TTA (STANDARD) T427337 - THRUST WASHER KIT - 1000 / 1004 / 1006 (SECOND OVERSIZE) T427336 - THRUST WASHER KIT - 1000 / 1004 / 1006 (STANDARD) T422292 - 4.236 / 6.354 / 1004 / 1006 T422291 - 4.236 / 6.354 / 1004/ 1006 T422290 T422289 U5TW0003 - THRUST WASHER KIT - 900 31137222 - 3.152 / 4.203 / 900 (.007" O/S) 31137221 - 3.152 / 4.203 / 900 31137212 - 3.152 / 4.203 / 900 (.007" O/S) 31137211 - 3.152 / 4.203 / 900

Genuine Cummins Crankshaft Washer for Watercrafts

Cummins is a leading marine crankshaft brand trusted globally by millions of vessel owners. At Alfa Marine Spare Parts, engineers pick products from the company after multiple quality checks to ensure you get high-quality products at competitive market prices. Because reliability, guaranteed uptime, performance, fuel efficiency, and emission control are the prime considerations for ships sailing on international waters. Choose OEM Cummins crankshaft thrust washer and bearings by part number to maintain precise expansion, cushioning, and propeller thrust control during engine operation.  0104-0416 0185-2207 0185-5468 0104-2197 0104-0416 0104-2041 Do you want to buy genuine Yanmar thrust bearings for marine crankshafts? Alfa Marine Spare Parts is a premier ship repair parts and offshore equipment supplier offering delivery services worldwide. We have selective Yanmar spare parts in our inventory to keep your vessel always on cruise without glitches. YM-129150-02931 - 4TNV88-BDHQ / 4TNV88-BDHQ(T) / 4TNV88-BDSA For presale queries and marine engine spare parts, please contact us via email or fill out the inquiry form. Click the 'Request a Quote' button on the top right corner of our site. Our staff member sends a quote and responds to all queries within 1-2 business days.