When unstacking/disassembly an engine, which parts should you mark with a stack line?

When unstacking/disassembly an engine, which parts should you mark with a stack line?

• A. Moving parts
• B. All parts
• C. Static (non-moving) parts
• D. The crankshaft only

Answer: (C)

When you unstack an engine, you want a stable reference for reassembly. Marking with a stack line on the parts that stay in place during operation gives you a fixed reference point for how the stack sits together. These static parts—like the block, head, covers, and other non-moving components—don’t shift as the engine runs, so the line you draw on them preserves the order and orientation of the stack. Moving parts, such as the crankshaft, camshafts, pistons, and valves, relocate or rotate during operation, so a stack line on them wouldn’t provide a reliable reference for reassembly. By focusing on the static components, you ensure accurate alignment and easier correct reassembly.

When you unstack an engine, you want a stable reference for reassembly. Marking with a stack line on the parts that stay in place during operation gives you a fixed reference point for how the stack sits together. These static parts—like the block, head, covers, and other non-moving components—don’t shift as the engine runs, so the line you draw on them preserves the order and orientation of the stack. Moving parts, such as the crankshaft, camshafts, pistons, and valves, relocate or rotate during operation, so a stack line on them wouldn’t provide a reliable reference for reassembly. By focusing on the static components, you ensure accurate alignment and easier correct reassembly.