OEM GMC Yukon Timing Chain

GMC Yukon Timing Chain Parts Questions & Experts Answers

• Timing Chain
  12646386
  Q: What tools are required to replace the timing chain and sprocket on engines LC9, LMG, LY2, and LY5 (4.8L and 5.3L) on GMC Yukon?

  A: Engine replacement of Timing Chain and sprocket on lc9 lmg ly2 ly5 (4.8L and 5.3L) requires these necessary tool collection: en 46330 Timing Chain Tensioner retaining pin (EN 46330), j 8433 puller bar (J 8433), j 41478 crankshaft front oil seal installer (J 41478), j 41558 crankshaft sprocket remover (J 41558), j 41665 crankshaft balancer and sprocket installer (J 41665), j 41816-2 the proper tools for Timing Chain and sprocket replacement on engines lc9, lmg, ly2, and ly5 (4.8L and 5.3L) include en 46330 Timing Chain Tensioner retaining pin (EN 46330), j 8433 puller bar (J 8433), j 41478 crankshaft front oil seal installer (J 41478), j 41558 crankshaft sprocket remover (J 41558), j 41665 crankshaft balancer and sprocket installer (J 41665), j 41816 install the j 42386-a Flywheel holding tool after removing the Oil Pump and Starter motor while checking that the tool's teeth fit properly with the engine Flywheel. Once the j 42386-a tool and its bolts are in place tighten the hardware to 50 n.m (37 lb ft). The crankshaft rotation should align the timing marks between the crankshaft and camshaft sprockets. At this point, extract the camshaft sprocket bolt, camshaft sprocket and Timing Chain and Timing Chain Tensioner. Begin by using tools j41816-2 and j41558 and j8433 to remove the crankshaft sprocket before proceeding to remove the crankshaft sprocket key if needed. Begin installation by placing the key inside the crankshaft keyway then tapping it further in before installing the sprocket by aligning the key with the sprocket keyway. The j 41478 and j 41665 tools will help position the crankshaft sprocket so it touches the crankshaft flange. Install the en 46330 before you fit the Timing Chain Tensioner along with its bolts. Tighten these fasteners to 25 n.m (18 lb ft). Check that the teeth of both sprockets mesh correctly and the alignment marks on the crankshaft sprocket and camshaft match accordingly. The camshaft sprocket should face the 6 o'clock direction before its installation with the Timing Chain and bolt and subsequent inspection of alignment quality. Begin by removing the en 46330 then gradually tighten the camshaft sprocket bolt to 90 n.m (66 lb ft) and continue to an additional 40-degree torque using the j 45059. Complete the installation by removing j 42386-a and its bolts then repositioning the Starter motor and Oil Pump.