Answer A is wrong. If the gauge reads (17-22 in Hg) this indicates a normal running engine.

Answer B is wrong. If the gauge reads low (15-20 in Hg) this indicates low valve or ignition timing, leaking manifold gasket, low compression, leaking carburetor, or stuck throttle valve.

Answer C is correct. If the gauge readings fluctuate between(15 and 20 in Hg) this indicates a stuck valve or engine miss.

Answer D is wrong. If the gauge reading drops slowly at an idle this indicates a clogged or blocked exhaust.

Answer A is wrong. Both are excepted methods.

Answer B is wrong. Both are excepted methods.

Answer C is Correct. Both metal pinning using pins or bolts and welding are acceptable methods for repairing a cracked block.

Answer D is wrong. Both are excepted methods.

Answer A. is wrong. This is a least question. An open oil pressure valve will cause low oil pressure.

Answer B is wrong. This is a least question. Worn main crankshaft bearings will cause low oil pressure.

Answer C is wrong. This is a least question. Worn camshaft bearings will lower oil pressure.

Answer D is correct. This is the least likely. It is unlikely that a valve guide will lower oil pressure.

Answer A is correct. Do to the nature of their design torque to yield bolts or stretch bolts should never be reused.

Answer B is wrong. Technician A is correct

Answer C is wrong. Technician A is correct

Answer D is wrong. Technician A is correct

Answer A is wrong. Technician C ic correct.

Answer B is wrong. Technician C is correct.

Answer C is correct. A dial gauge is used to measure end-play clearance.

Answer D is wrong. Technician C is correct.