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Question

Difficulty: HardWrenches

A technician is installing an engine intake manifold that requires a staged tightening procedure using hand tools and a calibrated micrometer click-type torque wrench. Arrange the following steps into the correct chronological sequence from the beginning of assembly to tool storage.

  1. 1Thread and seat all fasteners finger-tight into the mounting holes.
  2. 2Run down the fasteners evenly until lightly snug in a specified sequence using a hand ratchet and socket.
  3. 3Tighten each fastener in sequence to the initial staged torque value using a click-type torque wrench.
  4. 4Pull the torque wrench in a smooth, continuous motion until it clicks at the final manufacturer torque specification.
  5. 5Adjust the torque wrench micrometer handle back to its lowest calibrated setting and store it in its protective case.

Answer

The correct sequence starts with threading fasteners finger-tight by hand, snugging them with a hand ratchet, applying the initial torque stage with a torque wrench, completing the final torque stage, and finally resetting the torque wrench to its lowest setting for storage.
The proper sequence proceeds logically from initial thread engagement to tool preservation: hand-starting fasteners prevents cross-threading, running them down with a ratchet seats the assembly, applying progressive torque stages distributes load evenly without warping the flange, and resetting the torque wrench relieves spring compression to maintain calibration accuracy.

Step-by-Step Solution

1
Inspect threads and start all fasteners by hand until finger-tight.
Fasteners engage cleanly without cross-threading the mating holes.
Hand-starting ensures proper thread alignment before any tool torque is applied.
2
Use a standard hand ratchet and socket to run down fasteners in the manufacturer pattern until snug.
Components are pulled flush against the gasket surface uniformly.
Snugging with a ratchet seats the flange evenly without exceeding initial torque limits.
3
Set the click-type torque wrench to the first-stage torque value and tighten each bolt in sequence.
Initial uniform clamping force is established.
Staged torquing prevents warping and gasket pinch.
4
Adjust the torque wrench to the final specified torque and pull steadily until the wrench clicks.
Fasteners achieve the required engineering tension.
Smooth, steady pulling ensures accurate break-over click without dynamic over-torquing.
5
Wind down the micrometer scale to its lowest setting (or zero) before returning the tool to its case.
Internal calibrated coil spring tension is completely relaxed.
Leaving a torque wrench under high spring tension causes spring set and calibration drift.

Key Concept

Staged fastener tightening sequence and micrometer torque wrench maintenance protocol
Estimated Time:1m 30s
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