K313 CVT Transmission Master Rebuild Kit Toyota Corolla

The 1.8L Corolla with the K313 CVT tends to come in for one of three reasons: a shudder or flare pulling away, slow engagement into Drive or Reverse, or a leak at the front of the case after the unit has been overheated. This master kit carries the frictions and steels for the direction clutches plus the full soft-parts set: piston seals, O-rings, shaft sealing rings and the case and valve body gaskets. The OE reference on the listing is K313 / T07600A, made up of sub-kits T07602A, T076080A and T076081A.

What the clutches and seals do in a K313

Transmission Digest describes the K313 as the belt CVT Toyota introduced in the 1.8L Corolla for 2014. It uses a torque converter, so the forward and reverse clutches stay applied at a stop instead of releasing the way some converterless CVTs do. The belt and pulleys set the ratio; the clutch pack ahead of them picks direction. Five solenoids in the valve body run everything, including SL, SLU and SC, which share the job of clutch engagement and converter lock-up.

All that control depends on sealed circuits. Once the fluid cooks, the piston seals and shaft rings harden, the forward clutch fills slowly and slips, and pulley pressure can no longer hold the belt. That is when a fluid change stops helping.

Symptoms that point to this kit

• Shudder or flare on light throttle from a stop
• Delayed or harsh engagement into Drive or Reverse
• Dark, burnt-smelling fluid with friction material on the pan magnet
• A front seal leak after the car was rocked out of snow or mud; TD documents a K313 that overheated badly enough to melt the front seal and filter neck
• Codes such as P0741 (lock-up performance, solenoid SL) or P0841 to P0843 (fluid pressure sensor) alongside a slip complaint

How to confirm before you buy

Check fluid level at the pan check plug with the fluid at temperature. Then compare turbine (NT), primary (NIN) and secondary (NOUT) speeds on a scan tool. A mismatch between turbine and primary pulley speed after engagement points at the clutch pack this kit replaces. If the speeds track but the car shudders under light load, look at solenoids first; our CVT harsh or delayed shifts guide covers the order of checks, and CVT limp mode causes covers code-driven failsafe.

Fitment

The listing calls out the Toyota Corolla 1.8L 2013-2016 and the Auris 1.8L 2014-2016. In North America the K313 arrived with the 2014 Corolla, so a US car built before that has the earlier K310 or K311 and needs a different kit. Read the transaxle tag and confirm it says K313, or send us the year and VIN. Browse other CVT parts on our CVT transmission parts page.

Install notes

• The transaxle has to come out and the case has to be split. Lay the old clutch pack out in order on a clean bench.
• Use sealing ring sizers so the new shaft rings are not stretched on install.
• Soak the frictions in CVT fluid and measure clutch clearance after stacking.
• Inspect the pulley bearings while you are inside; the K313 bearing kit is cheap insurance on a high-mile unit.
• If the old unit set solenoid codes, replace them now with the K313 five-piece solenoid kit.
• Fill with Toyota CVT Fluid FE through the rear cover fill plug; TD puts total fill near 7.5 L. Set level at the pan check plug at temperature.

For the broader picture on how belt CVTs wear out, read CVT transmission failure patterns.

Will this fit my 2012 Corolla?

Probably not if it is a US car. The K313 came to the North American Corolla for 2014; earlier cars used the K310 or K311 or a conventional automatic. Check the transaxle tag.

What fluid goes back in?

Toyota CVT Fluid FE. Transmission Digest lists close to 7.5 L to fill a dry unit. Do not use a universal ATF.

Does the kit include a filter or the belt?

No. It covers frictions, steels, gaskets, seals, O-rings and sealing rings. The belt, pulleys, pump, valve body and filter are separate.

Can I do this without removing the transmission?

No. The clutch pack and shaft sealing rings are inside the case, so the transaxle has to be removed and split.

What should I replace with the kit?

On a high-mile or overheated unit, replace the pulley bearings and any solenoid that set codes, and inspect the torque converter and valve body for heat damage.

• CVT Harsh or Delayed Shifts: A Diagnostic Walkthrough
• CVT Limp Mode: Causes and How to Diagnose It
• CVT Slipping Under Load: Root Causes and Fixes
• CVT Transmission Failure Patterns: What Breaks Across Every Brand