Specifications

Problem:
The manual speciies 150 - 160 Hz as the tension setting
for the inal tension (T2) with the BTT Hz.
Subjective measurement results in the timing belt being
tensioned too high.
Cause:
Fiat’s nominal setting with a frequency gauge, applicable since
the 2003 model year, is determined by adding two measure-
ments. The irst reading (between the camshaft pulley and the
water pump) and the second reading (between the crankshaft
and the tensioning pulley) have to be added. Older models can
also be set using the BTT Hz.
Solution:
Pretension the timing belt to 7 Nm at the tensioning pulley
using a torque wrench. Then secure the tensioning pulley
and perform two engine revolutions. Now measure the readings
at the two measuring points. The total value should be 150 -
160 Hz. Alternatively, you can also perform just one measure-
ment above the water pump. The reading here should be
125 Hz.
Excerpt from the manual
BTT Hz
Measuring points
ContiTech Technical Info 9
BTT Hz
Fiat Punto Motor 188 A4
Setting the timing belt tension by means of frequency measurement