11 . Apply clean engine oil to each bore to prevent rusting. NOTICE: Refer to “Notice” on page 1. Install or Connect 1 . Front oil gallery plugs. Coat plug outside diameter with sealant (GM P/N 12346004) or equivalent. 2 . Rear oil gallery plugs. Tighten • Left rear plug to 20 N · m (15 lb. ft.). • Right rear plug to 25 N · m (18 lb. ft.). • Left side plug to 20 N · m (15 lb. ft.). IMPORTANT: Do not have residue on camshaft bearing or seizure may result. 3 . Camshaft and balance shaft cup plugs to proper depth. Coat plug outside diameter with sealant (GM P/N 12346004) or equivalent. 4 . Oil filter adapter, gasket, and bolts. Tighten • Bolts to 25 N · m (18 lb· ft.). 5 . Coolant drain plugs.
Tighten • Plugs to 20 N · m (15 lb· ft.) 6 . Oil pressure fitting and sensor. Tighten • Fitting to 11 N · m (97 lb. in.) plus turn for alignment if necessary. Piston Disassembly NOTICE: The connecting rod, bearing and cap need to be stored together as mating parts, so they may be reassembled in the same position from which they were removed. Figures 12-29 through 12-31 Tool Required: • J 24086-B Piston Pin Remover and Installer Set Remove or Disconnect 1 . Piston rings. In most cases, the rings should be discarded and replaced with new ones at assembly. 2 . Connecting rod bearing inserts.
If the inserts are to be reused, place them in a rack so they may be reinstalled in their original connecting rod and cap. 3 . Piston pin. • Place the piston / connecting rod on support fixture J 24086-20. Make sure the connecting rod is fully supported. • Press out the piston pin. Clean 1 . Piston. • Remove all varnish and carbon deposits. DO NOT USE A WIRE BRUSH. • Remove the carbon from the ring grooves. • Oil control ring groove holes. Inspect 1 . Piston pin bore in the piston and connecting rod. Check for scuffing, burrs, etc. 2 . Piston for scratches wear, etc. 3 . Connecting rod for cracks, nicks, etc.
If a suitable jig is available, check the connecting rod for a bent or twisted condition. Figure 12-29 Piston Rings and Components G643 (E) Service Manual Chapter 3. Engine Mechanical System 76