OEM 2002 GMC Safari Timing Chain

2002 GMC Safari Timing Chain Parts and Q&A

• Q: How to replace the timing chain and sprockets on 2002 GMC Safari?

  A: A Timing Chain replacement starts by removing both the engine front cover and the Crankshaft position sensor reluctor ring. A 7/16-20 x 1 inch bolt needs installation into the Crankshaft's end for rotation purposes but you must avoid using the Crankshaft balancer bolt or any bolt longer than 1 inch since it causes damage to bolt threads as well as Crankshaft threaded holes. Timing Chain replacement should start by positioning the timing marks in proper alignment. Before turning the camshaft or Crankshaft with the Timing Chain off it's necessary to loosen or remove the valve rocker arms to stop piston-valve contact from occurring. Use a 1-inch bolt to rotate the Crankshaft until both sprocket timing marks perfectly align and cylinder number four reaches its compression stroke's top dead center position. Once the Timing Chain and sprockets leave the system you need to clean and inspect them. Follow these steps for installation: start with the Timing Chain and sprockets installation but don't reuse the engine front cover due to potential oil leakage concerns. The Crankshaft bolt removal procedure closes the installation process.