Rod Bolt Stretch Monitoring Chart & Instructions - Connecting Rod Bolt Gauge Log

This document is a Rod Bolt Stretch Monitoring Chart, apparently part of connecting rod or rod bolt packaging/instructions. The left column contains instructions explaining the importance of monitoring rod bolt condition using a stretch gage: before installing the rods, each bolt's length should be measured in the "relaxed" (untorqued) condition and recorded on the chart. At engine teardown for maintenance, each rod bolt is measured again, keeping each bolt in its original location. If any rod bolt has stretched by .001 inch or more from the original measurement, it must be replaced immediately because it has exceeded its yield point and is prone to failure. The visible portion of the chart provides fill-in blanks for ROD #1, ROD #2, ROD #5, and ROD #6, each with lines for an INSIDE BOLT and an OUTSIDE BOLT, and "IN" and "OUT" measurement fields for each. (Cells for other rods, e.g., #3, #4, #7, #8, are presumably on portions of the card not visible in this photo.) The document is undated and does not identify a specific vehicle make, model, or part number; it is a generic engine-building reference for tracking rod bolt stretch over the life of the engine.