OEM Buick LaCrosse Exhaust Manifold

Buick LaCrosse Exhaust Manifold Parts and Q&A

• Exhaust Manifold, Driver Side
  12571074
  Q: How to replace the left side exhaust manifold (RPO LY7) on Buick LaCrosse?

  A:

  The replacement process of left Exhaust Manifold rpo ly7 requires users to first detach oil lever accessory and tubing followed by left engine mount through bolts and right engine mount through bolts. The exhaust crossover pipe must be detached from the left Exhaust Manifold after removing all five retaining nuts before the Exhaust Manifold heat shield can be taken away using its bolt screws. The Exhaust Manifold bolts need removal and then you can take the manifold apart while you dispose of the old gasket and perform cleaning operations on the sealing surfaces. During installation first put the bolt through a bolt hole from the Exhaust Manifold and then place a new Exhaust Manifold Gasket on the bolt. Set the Exhaust Manifold correctly against the Cylinder Head before tightening the bolt that came with it until it reaches a secure position. Secure the rest of the Exhaust Manifold bolts at 20 n.m (15 lb ft). Secure the Exhaust Manifold heat shield with its bolts then tighten them to 10 n.m (89 lb in). The exhaust crossover pipe should be fastened to the Exhaust Manifold using five nuts which should be tightened to 34 n.m (25 lb ft). The procedure ends with installing the left and right engine mount strut through bolts at 48 n.m (35 lb ft) while reattaching the oil lever indicator and tube.
• Exhaust Manifold, Driver Side
  12588004
  Q: How to replace the right exhaust manifold on Buick LaCrosse?

  A:

  The right Exhaust Manifold replacement process starts by removing firstly the fuel injector sight shield then the exhaust crossover heat shield nuts followed by the heat shield. First raise and support the vehicle before removing stud nuts from the exhaust crossover pipe attached to the right Exhaust Manifold. Lower the Exhaust Manifold by first taking out the Exhaust Manifold pipe stud nuts and the catalytic converter pipe from its right component. During right-side exposure the ho2s electrical connector should be detached from the sensor at the right Exhaust Manifold before removing the sensor itself. Begin by removing right side Spark Plugs of cylinders 2 and 4 and 6 and moving onto the fuel injector sight shield bracket nuts then bracket itself. Begin removing the right engine lift bracket bolt followed by its nut which will clear the way for lift bracket before proceeding to extract the right Exhaust Manifold heat shield bolts and finally remove the heat shield. After raising the vehicle to detach the bolt securing the egr valve inlet adapter pipe from the right Exhaust Manifold, lower it for manifold stud and nut extraction and complete the step by removing the right Exhaust Manifold and gasket. The technician must switch any damaged Exhaust Manifold studs before executing stud and right Exhaust Manifold removal procedures. The first installation step begins with Exhaust Manifold studs unless these were already removed then insert right Exhaust Manifold gasket followed by right Exhaust Manifold . Screw in the Exhaust Manifold studs and attaching nuts before tightening them to 30 nm (22 ft. Lbs.). Raising the vehicle lets you install and torque the egr valve inlet adapter pipe bolt to the right Exhaust Manifold with 29 nm (21 ft. Lbs.) torque setting before lowering the vehicle to tighten right Exhaust Manifold heat shield bolts to 10 nm (89 inch lbs.). Mount the right engine lift bracket to its bolt and nut then fasten them to 30 nm (22 ft. Lbs.), before installing the fuel injector sight shield bracket with its nut fastened to 30 nm (22 ft. Lbs.). Spare time to reinstall right side spark plugs into cylinders 2, 4, and 6 before installing the ho2s to the right Exhaust Manifold and the ho2s electrical connector to the engine sight shield bracket while properly connecting the electrical connector . Raise the vehicle right after setting the engine back into position and attach the catalytic converter pipe to the right Exhaust Manifold by tightening catalytic converter pipe stud nuts to 35 nm (26 ft. Lbs.). The crossover Exhaust Pipe studs need installation onto the right Exhaust Manifold at a torque of 20 nm (15 ft. Lbs.). Following this, the exhaust crossover heat shield along with its fastening nuts should be attached then torqued to a torque value of 20 nm (15 ft. Lbs.). The fuel injector sight shield and engine mount struts need installation to complete the procedure.