Four replacement bearings for the Toyota K313 and K310 CVT, covering the pulley shaft and differential positions you have to renew on any teardown.
A Corolla CVT that hums louder as road speed climbs, keeps humming when you lift off the gas, and leaves fine metal on the pan magnet usually has a bearing problem, not a belt slip problem. This four-piece kit gives you the bearings that carry the pulley shafts and differential in the Toyota K313 CVT, the unit Toyota put behind the 1.8L Corolla starting in 2014, and fits its K310 relative as well. Once the case is split, these are the parts you replace no matter what else you find.
The K313 drives through a torque converter into a forward/reverse clutch set, then to a steel push belt running between a primary and a secondary pulley. To transmit torque without slipping, the transmission squeezes that belt with high hydraulic clamp force, and every bit of that load ends up on the shaft bearings. The kit contains four bearings, sized as listed:
All four are high-carbon chromium bearing steel. When one goes rough, the pulley it supports runs slightly out of line, the belt tracks off center, and the pulley faces begin to score. That is how a cheap bearing turns a rebuild into a pulley replacement.
Rule out wheel bearings and tires first, since a front hub bearing on a Corolla makes a very similar speed-related hum. Lift the car, run it in gear and listen at the bellhousing and each hub with a stethoscope. Then drain the fluid and inspect the magnet. Heavy metal or a burnt smell means the unit needs to come apart. Our CVT failure patterns guide explains how bearing wear differs from belt slip, and CVT slipping under load covers the case where the belt is already slipping.
This kit is listed for the Toyota K313 and K310 CVT. In the US, the K313 appears in the 1.8L Corolla from 2014 on; the K310 family covers the earlier and smaller-engine applications. Bearing sizes are the best check, so measure your old bearings against the dimensions above, or send us your year and VIN and we will confirm the unit. More parts for these transmissions are on our CVT parts page.
| Fits | |
| Bearing 1 | |
| Bearing 2 | |
| Bearing 3 | |
| Bearing 4 | |
| Material | |
| Pieces | |
| Shipping Weight |
Toyota introduced the K313 in the 2014 Corolla with the 1.8L engine. The kit is also listed for the related K310. If your car has a 4-speed automatic or a manual, this is not your part. Send your year and VIN if you are unsure.
Only if the bearings are the cause and the pulleys and belt are still in good condition. If the bearing has run long enough to let the belt score the pulley faces, the pulleys also need replacing. Inspect them while the case is open.
Toyota Genuine CVT Fluid FE. A K313 does not tolerate generic ATF. Transmission Digest lists a fill close to 7.5 liters; check the final level hot at the check plug.
You can, but it rarely makes sense. All four share the same load history, and once the unit is apart the bearings are a small part of the cost. Replacing the full set avoids a second teardown.
No. It contains four bearings only. Seals, gaskets and clutches come in the K313 master rebuild kit, and endplay shims are selected for your unit at assembly.
