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Verify your engine specs with a service manual for your year and model. always torque bolts in three equal increments. Bolts or Parts. Lube or Sealer. Torque to: Main Caps. Engine Oil. 70 ft-lbs. Outer Main Cap Bolts.
The bolt is stressed up to the proofload value, and if there is no deformation, elongation, or fracture, then the bolt is deemed to have passed. For bolting specifications that do not have a published proofload, it is usually calculated at 92% of minimum yield strength.
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.
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. Torque values for 1/4 and 5/16-in series are in inch-pounds.
Torque intake manifold bolts in two steps (sequence is shown below): • Step 1: Tighten to 5-10 lb. ft (6-14 Nm) • Step 2: Tighten to 15-18 lb*ft (31-34 Nm) • Note: Repeat step 2 several times until bolt torque is stabilized • Re-torque after 10 engine heat cycles – completely cold to full operating temperature 8 6 4 2 12 10 5
SAE J429 grade 5 bolts do not exceed 1-1/2" diameter. ASTM A193 B7 Tension lbs Tightening Torque (ft lbs) ... 5⁄8 11 24000 29000 125 - 151 250 - 302 3⁄4 10 35000 42000 219 - 263 438 - 525 7⁄8 9 49000 59000 357 - 430 715 - 860 ... ASTM A354 -BD / SAE GRADE 8 Bolt SIze TPI Tension lbs Torque range ft lbs Min Max Lubed Plain
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.
