21020-2G100 Main Bearing Set | Hyundai Sonata, Genesis G70

21020-2G100 Main Bearing Set – 10 Pcs Crankshaft Main Bearings for Genesis G70, Hyundai Sonata 2008-2020

Dhs. 138.97

21020-2G100 Main Bearing Set for Hyundai and Genesis

This 21020-2G100 main bearing set is a 10-piece crankshaft main bearing set for Hyundai and Genesis four-cylinder engines. It is listed under part numbers 21020-2G100, 21020-25100 and 21020-2G000, and the listing names the Hyundai Sonata from 2008 to 2020 and the Genesis G70. Easy Life Markets sells it as a complete set of main bearing shells for engine rebuilders and workshops carrying out bottom-end repairs.

Main bearings are the thin, curved shells that sit between the crankshaft and the engine block. They carry the crankshaft on a film of pressurized oil, so the metal surfaces never touch while the engine is running. These are plain bearings, and when they wear or are damaged by dirty or low oil, the result is low oil pressure, knocking and, eventually, crankshaft damage.

What Is Included

10 x crankshaft main bearing shells (one full set of upper and lower halves)

The product photos show the bearing shells with their oil holes, grooves and locating tabs. Connecting rod bearings, thrust washers and gaskets are not listed as included.

Specifications

Product type: Crankshaft main bearing set
Part numbers: 21020-2G100, 21020-25100, 21020-2G000 (also written 210202G100, 2102025100, 210202G000)
Pieces: 10
Brand: Unbranded aftermarket
Condition: New
Color: Silver
SKU: CJQT232616101AZ

Compatibility

The supplier lists this set for the Hyundai Sonata (2008–2020) and the Genesis G70, using the part numbers above. Bearing part numbers are often shared across several engines and models, but engines of the same size can use different bearings, and some bearing sets are made in more than one size or color grade. To confirm fit:

Match the part number with a Hyundai or Kia parts catalogue for your vehicle, using your VIN.
Check your engine code on the engine block or the vehicle label.
Measure the crankshaft journals during the rebuild. If the crankshaft has been ground undersize, you will need undersize bearings instead of a standard set.

If you are not sure, send us your VIN and engine details and we will help you check before you order.

Signs of Worn Main Bearings

Deep knocking from the bottom of the engine, often louder under load
Low oil pressure warning, especially when the engine is hot
Metal particles in the oil or oil filter
Excessive crankshaft end play or movement
A history of oil starvation, overheating or very long oil change intervals

Installation Notes

Main bearing replacement is a precision job and is usually done during a full engine rebuild with the crankshaft removed. Professional installation is recommended. Key points:

Clean the block saddles, main caps and the back of each shell. Never oil the back of a bearing shell.
Seat each shell's locating tab in its notch, and make sure the oil holes line up with the oil passages.
Check running clearance with plastigauge or a micrometer and bore gauge, and compare it with the service manual.
Lubricate the bearing faces with clean engine oil or assembly lube before fitting the crankshaft.
Tighten the main cap or bedplate bolts in the correct sequence and to the correct torque and angle. Many of these bolts are single-use.

Finding the Cause of Bearing Failure

New bearings will not last if the cause of the original failure is still there. Before reassembly, inspect the crankshaft journals for scoring, check the oil pump and pickup screen, and flush all oil passages so no debris remains. Look at the old shells too: wear on one side, scoring, or a copper layer showing through can all point to a specific cause, such as oil starvation, contamination or a bent crankshaft.

Why Replace the Full Set

Even if only one bearing shows damage, all of the main bearings have been exposed to the same oil and the same debris. Fitting a complete set gives every journal fresh, even clearances and avoids opening the engine again. A full 10-piece set means all five main journals can be done in one job.

Keeping the Engine Healthy After the Rebuild

Prime the oil system before the first start so the bearings never run dry. Change the oil and filter after the first few hundred kilometers to remove assembly debris, then follow the manufacturer's service interval with the recommended oil grade. Keeping the oil level topped up is the single best way to protect new main bearings.

Who This Set Is For

This main bearing set suits engine rebuilders, independent workshops and experienced home mechanics who are rebuilding a Hyundai or Genesis four-cylinder engine and have confirmed the part number for their engine.

Common Questions

Is this a genuine Hyundai part? No. It is an unbranded aftermarket bearing set sold under the Hyundai reference numbers so you can match it to your engine.

Are rod bearings included? No. This set is for the crankshaft main bearings only.

What size are the bearings? The supplier does not state an oversize or undersize, so check with us before ordering if your crankshaft has been ground.

Buy the 21020-2G100 Main Bearing Set at Easy Life Markets

You can order this main bearing set right here. The current price and availability are shown on this page. Please read our return and refund policy before buying.