A1 Engine
Repair
Review Answers
Reading Your Results: A1 Engine Repair, Test 2
This test comes at the same content areas from the bench rather than the driveway. There are more measurements with a published limit attached and more questions about the order a procedure has to run in, so the questions you missed here point somewhere different than the ones on Test 1 would.
If you missed the questions with a measurement and a limit
Three questions on this test give you numbers and a specification. When those go wrong, the problem is usually the setup rather than the arithmetic, because each of these readings is only valid under a condition the question expects you to know.
If you missed the procedure questions
Four questions here turn on sequence. Timing chain slack is judged by how far the crankshaft rotates before the camshaft follows, which means the measurement is the rotation rather than the chain itself. Tracing a leak with fluorescent dye only works if the area is cleaned first, because old residue will fluoresce and send you to the wrong seal. Checking for a leaking injector or check valve means pressurizing the rail and then watching whether it holds, so the pressure has to be there before the observation starts. On the exam, these questions are asking whether you know what would invalidate the result.
If you missed the component function questions
The three component questions on this test all have a failure story attached. Bearing crush is what holds the insert tight in its bore so it transfers heat and cannot spin, which is why bearings are never filed or shimmed to fit. The crankshaft vibration damper absorbs torsional vibration along the crank, so a damper with a separated rubber ring puts that vibration back into the crankshaft and eventually into the timing components. The oil pump pressure relief valve sets a ceiling rather than a supply, which is why raising its spring pressure hides a clearance problem instead of correcting one.
If you missed the EXCEPT and LEAST likely questions
There are four 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 blue smoke question, three answers all give oil a path into the combustion chamber under load and one does not. On the hot hard-start question, three affect fuel delivery or spark when everything under the hood is heat-soaked, and one is unrelated to temperature. Naming the shared trait first is faster and far more reliable than reasoning through four options one at a time.