A3 Manual Drive
Train & Axles
Review Answers
Reading Your Results: A3 Manual Drive Train and Axles, Test 2
This test comes at the same content areas from the bench. There are more questions about setup and assembly procedure, more clutch service, and more of the four-wheel drive faults that bind or fail to transfer torque rather than making a noise. The questions you missed here point somewhere different than Test 1's would.
If you missed the differential setup questions
Ring and pinion setup is where A3 separates technicians who have done the job from those who have read about it, and this test leans on it. Backlash is the clearance between the meshing teeth and is changed by moving the ring gear laterally with side bearing adjusters or shims, so too much backlash means the ring gear sits too far from the pinion. Pinion depth is a separate setting made with a shim behind the pinion head bearing, and it controls where on the tooth face the contact pattern sits. A collapsible spacer is a one-way adjustment: it crushes permanently to set preload, so the nut is tightened in small steps with preload checked after each one, and it can never be backed off to recover. Keeping those three straight is most of the battle, since correcting one with another produces an axle that reads acceptable on paper and howls on the road.
If you missed the questions built on a measurement
Three questions here give you a reading against a limit, and each one is asking whether you know what the number controls.
If you missed the clutch service questions
Several questions here are about doing clutch work in a way that will not create a comeback. Pressure plate bolts are tightened gradually in a crossing pattern so the cover seats evenly and the diaphragm is not distorted. A clutch disc has a longer hub on one side and it faces a specific direction, which is why a disc installed backward will not release. Oil on a disc facing changes the friction unevenly across the surface, so the clutch grabs and releases as it engages and the customer describes it as chatter rather than slip. On the exam, these questions are asking whether you know what the step is protecting against.
If you missed the EXCEPT and LEAST likely questions
Four appear on this test, and the method is the same one that works on the real exam. Identify what the three real causes share before you look for the odd one out. On the clunk-on-torque-reversal question, three answers all involve lash being taken up somewhere in the driveline and one is a balance problem that produces a vibration instead. On the pinion-seal-leak question, three answers all drive lubricant past that seal and one is a bearing that sits too far inboard to affect it. Naming the shared trait first is faster and far more reliable than working through four options one at a time.