Lower Crankcase Installation

WARNING: This page is about a different variant/trim than selected.

Fig 1: Lower Crankcase With Bolt Tightening Sequences

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
1	Crankshaft Lower Bearing (Qty: 5) Procedure Install the bearings in the lower crankcase, and ensure that the guide lug on the bearing is properly seated to the notch in the lower crankcase for each bearing. Coat the crankshaft bearing shell with engine oil.
2	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 . Install the lower crankcase, ensure the lower crankcase is aligned properly on the dowels. Tap gently into place with a suitable tool, if necessary.
3	Lower Crankcase Bolts (Qty: 10) 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 in sequence a first pass to 15 N.m (11 lb ft). Using the EN 45059 angle meter, tighten the bolts in sequence a final pass to 180 degrees. Special Tools EN-45059 Angle Meter For equivalent regional tools, refer to Special Tools .
4	Lower Crankcase Bolts (Qty: 13) Procedure Apply sealant to the lower crankcase perimeter bolts. Refer to Adhesives, Fluids, Lubricants, and Sealers . Tighten the lower crankcase bolts in the sequence shown. Tighten the bolts in sequence a first pass to 5 N.m (44 lb in). Tighten the bolts in sequence a final pass to 10 N.m (89 lb in).