Lower Crankcase Installation (L5Q)

Fig 1: Identifying Lower Crankcase Components And Bolts With Tightening Sequences (L5Q)

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
1	Lower Crankcase Procedure Ensure proper use of room temperature vulcanizing (RTV) sealant. Use of Room Temperature Vulcanizing (RTV) and Anaerobic Sealant NOTE: The block assembly surface must be free of contamination prior to applying the sealer. Install and align the bedplate to block within 20 minutes of applying the sealer. The bedplate must be fastened to final torque specification within 60 minutes of applying the sealer. Apply a 3 mm bead of sealer directly in the groove of the block to bedplate mating surfaces. Refer to Adhesives, Fluids, Lubricants, and Sealers (Europe L5Q)Adhesives, Fluids, Lubricants, and Sealers (North America L5Q) . Install the lower crankcase, ensure the lower crankcase is aligned properly on the dowels. Tap gently into place with a suitable tool, if necessary.
2	Lower Crankcase Bolts [8x] CAUTION: Refer to Fastener Caution . CAUTION: Refer to Torque-to-Yield Fastener Caution . Procedure Tighten the NEW lower crankcase bolts in the sequence shown. Tighten the bolts a first pass to 15 N.m (11 lb ft). Using the EN 45059 angle meter, tighten the bolts a final pass to 180 degrees. Special Tools EN-45059 Angle Meter For equivalent regional tools, refer to Special Tools .
3	Lower Crankcase Perimeter Bolts [7x] Procedure Install all the lower crankcase perimeter bolts, then tighten in the sequence shown.
4	Lower Crankcase Perimeter Bolts [2x] Procedure Tighten the lower crankcase perimeter bolts in the sequence shown. Tighten the bolts a first pass to 5 N.m (44 lb in). Tighten the bolts a final pass to 10 N.m (89 lb in).