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25 Δεκ 2008 · 1991 FSM page 6A1-48. Connecting Rod Bearing Cap Nut is 26 foot pounds. Crankshaft Main Bearing Cap Nut is 40 foot pounds.
Due to many variables that affect the torque-tension relationship like human error, surface texture, and lubrication the only way to determine the correct torque is through experimentation under actual joint and assembly conditions.
Tightening Torque Guide for Grade 5 & 8 Hex Cap Screws. This table is based on IFI 5th Edition Technical Data N-12/N-16, using Equation (1) and a torque coefficient, K=0.20 for non plated steel fasteners and K=0.15 for plated fasteners.
Use Prevailing Torque All-Metal Nut chart if using this style of nut. = Nominal Diameter. = Clamp Load For J429 Grade 5 and 8, FNL Grade 9, A574, Class 4.6, 8.8, 10.9 and 12.9, the clamp loads are listed at 75% of the proof loads specified by the standard. For A307 Grade A, 75% of 36,000 PSI is utilized.
Torque-Tension Relationship for A307A, Grade 5, 8 & 9 Bolts. The torque values can only be achieved if nut (or tapped hole) has a proof load greater than or equal to the bolt's minimum ultimate tensile strength. Clamp load calculated as 75% of the proof load when specified by the standard. ASTM A307 utilized 75% of 36,000 PSI.
Below is a chart showing the size markings of the Grade 5 & Grade 8 bolts and their torque values by bolt size. Anytime the OE does not supply a torque value, this chart listed below should be used to correctly torque a bolt. These values apply to DRY bolts with no lubricant applied.
METRO. 60 (81) PRIZM & STORM. 76 (103) SPECTRUM & TRACKER. 65 (88) SPRINT. 29-51 (39-69) GEO BOOTKITS GEO AXLES.
