There is no balance shafts belts on a 2.0 ltr 924.What your seeing is your timing belts,balance shafts belts were install only on the 924S/944s. the 2.5 being quiet large for an inlin four cyl & in order to dampens vibration Porsche had no choice but to install them.If the pully on your cam did freeze change it rigth away & install a new timing belt.The plus of the 924 motor is if the timing belt goes on it you won't end up with bend valves versus the 944s 2.5 which we commonly
call a close contact motor.
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83-944 show room -sold___New ride 93-968 with SC steering wheel-ROW signal ligths- Susp M030 mods lowered,Porsche VA springs- Adjustable struts - Bilstein inserts - Bilstein sport rear -LSD -riding on Cup 1 wheels 17x8 frt 17x9.5 rear road contact Falken 452/ 225-45 ZR Front 255-40 ZR Rear -- Motor Mods /chip /K&N / mod air boxe just love the handling & power