The SAAB AOM does state a limitation of 47 degrees C.
Measured how?
By whom?
With what equipment? Mercury thermometers, the common rotary dial gauges & digital gauges all rear differently with different reaction times or lag
Where? Engine compartment, ambient? ambient in the shade, ambient at aerodrome reference?
The limitation probably relates to hot fuel handling of the engine - which will have more to do with heat soak than ambient conditions.
The role of a pilot is to make judgement decisions, this is one of them .