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Why is the CT 919 K1/K3 called an “upgrade”?

April 26, 2017called CT K1 K3 upgrade

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Why is the CT 919 K1/K3 called an “upgrade”?

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The corresponding type of engine is factory fitted with a belt similar to CT 849 (152 teeth, OEM number 058109119D). According to VW/Audi documentation, the thermal damper has to be exchanged for a hydraulic damper when the timing belt is changed. This replacement requires a different timing belt called a CT 919 (153 teeth, OEM number 058109119C). This means that an upgrade kit is required, containing the changed belt, a pulley and damper.