Maitland driver Hayden Jackson was racing against the clock at the Newcastle 500 on Friday, trying to repair his vehicle in time for the second Toyota 86 practice session.
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Jackson, 23 of Metford, experienced mechanical difficulties in the morning timeslot and was only able to complete four laps.
The issue is believed to be the drive shaft.
Jackson and the Team RSG pit crew were working to fix the problem.
His best lap time of one minute and 29.2950 seconds was 23rd fastest for the Supercars support class.
Newcastle's Gavan Reynolds (1:29.0122) was 21st.
Dylan Thomas (1:27.7117) was top of the Toyota 86 charts.
In the Aussie Racing Cars and Warners Bay driver Charlotte Poynting finished 14th in her opening practice session with a time of 1:24.7972.
Merewether debutant Cody McKay (1:25.5241) finished 19th.
Justin Ruggier (1:21.7808) was the quickest in Aussie Racing Cars.
In the SuperUtes section Ben Walsh set a track record of 1:29.8466.
Kurt Kostecki (1:12.8328) was pick of the bunch in the Dunlop Super2 Series.
