Genuine Chevrolet Trailblazer Pushrod

Chevrolet Trailblazer Pushrod Parts Questions & Experts Answers

• Rod,Valve Push
  10238852
  Q: How do you detach and reinstall rocker arms and Pushrod while ensuring proper maintenance and assembly in V8 engine on Chevrolet Trailblazer?

  A: Detach the valve covers from the cylinder heads, then loosen the rocker arm pivot bolts one at a time to detach the rocker arms and bolts, followed by the pivot support pedestal, ensuring to keep track of the rocker arm positions for reinstallation. Store each set of rocker components separately in marked plastic bags. Remove the pushrods and store them separately to avoid mixing during installation, noting the arrow indicating the front of the engine. Check each rocker arm for wear, cracks, and damage, particularly at the pushrod and valve stem contact points, and inspect the pivot bearings for binding and roughness; if worn or damaged, the entire rocker arm must be replaced. Ensure the hole at the pushrod end of each rocker arm is open and inspect the pushrods for cracks and excessive wear, checking that the oil hole is not clogged, rolling each pushrod across a piece of plate glass to detect any bending. Lubricate the lower end of each pushrod with clean engine oil or assembly lube and install them in their original locations, ensuring each pushrod seats completely in the lifter socket. Apply engine assembly lube to the ends of the valve stems and upper ends of the pushrods to prevent damage during initial start-up, and also apply clean engine oil to the pivot shaft and bearing of each rocker arm before loosely installing the rocker arms in their original locations without tightening the bolts. Rotate the crankshaft until the number one piston is at TDC, then tighten the intake valve rocker arms for cylinders 1, 3, 4, and 5, and the exhaust rocker arms for cylinders 1, 2, 7, and 8, ensuring each rocker arm bolt is tightened to the specified torque. Rotate the crankshaft 360 degrees and tighten the intake valve rocker arms for cylinders 2, 6, 7, and 8, and the exhaust rocker arms for cylinders 3, 4, 5, and 6, again tightening each rocker arm bolt to the specified torque. Finally, install the valve covers and start the engine, listening for unusual valve train noises and checking for oil leaks at the valve cover gaskets.