OEM Buick Lucerne Exhaust Manifold

Buick Lucerne Exhaust Manifold Parts and Q&A

• Exhaust Manifold, Passenger Side
  12580260
  Q: How to replace the right side exhaust manifold (RPO L26) on Buick Lucerne?

  A:

  The replacement process of right side Exhaust Manifold (RPO L26) begins with removing intake manifold cover and right side Spark Plugs. First disconnect and remove the heated Oxygen Sensor (HO2S) electrical connector from the engine harness and take away its pigtail clip from the sight shield bracket. If present also strip out the secondary air injection (AIR) shutoff and check valve. The installation begins with disconnection of the ho2s from its Exhaust Manifold position before performing power brake booster heat shield nut removal and the heat shield removal. Disconnect the studs that link the exhaust crossover to the right Exhaust Manifold and also the transaxle fill tube and Catalytic Converter. After you detach the bracket nuts from the sight shield you should remove both the right engine lift bracket bolt and nut and the engine lift bracket. Begin the procedure by loosening the bolts that secure the Exhaust Manifold heat shield and shield and the bolt that attaches the egr valve adapter pipe followed by removal of the Exhaust Manifold studs and nuts to finish by discarding the Exhaust Manifold Gasket together with the exhaust crossover pipe seal. Install the manifolding service by applying a new exhaust crossover pipe seal and a new Exhaust Manifold Gasket onto the Exhaust Manifold before installing the manifold. Secure the studs at 30 n.m (22 lb ft) while nuts need 25 n.m (18 lb ft) torque. Fasten the egr valve adapter pipe bolt to 25 n.m (18 lb ft) while tightening the bolt. Secure the Exhaust Manifold heat shield by using bolts that achieve a torque force of 10 n.m or 89 lb in. Reattach the engine lift bracket while tightening its right bracket bolt and nut to 25 n.m (18 lb ft). The procedure begins with nut and sight shield bracket attachment at 30 n.m (22 lb ft) torque level. Subsequently, attach and tighten the Catalytic Converter alongside the transaxle fill tube. Replace and torque to 18 n.m (13 lb ft) the studs which connect the exhaust crossover to the right Exhaust Manifold before putting back the power brake booster heat shield along with torqueing its nuts to 20 n.m (15 lb ft). The threads of the ho2s sensor require application of the anti-seize compound gm p/n 12377953 or equivalent when installing them to the Exhaust Manifold with 42 n.m (31 lb ft) torque setting. The engine harness electrical connector must be connected to the ho2s and the ho2s pigtail clip should be placed on the sight shield bracket followed by reinstalling the air shutoff and check valve (if equipped) and the right side spark plugs and the intake manifold cover.
• Exhaust Manifold, Driver Side
  12588004
  Q: How to replace the left exhaust manifold (RPO L26) on Buick Lucerne?

  A:

  The procedure for left Exhaust Manifold (RPO L26) replacement starts with removing the oil level indicator and tube followed by unplugging the Spark Plug Wires from the Spark Plugs before removing the Spark Plug wire channel on the rocker cover. First remove the engine harness clip from the engine lift bracket and afterward eliminate the engine lift bracket bolt and nut and separate the engine lift bracket. Remove two exhaust crossover attaching bolts from the left Exhaust Manifold before taking off all Exhaust Manifold heat shield bolts and the shield. Reverse-direction disassembly requires removing the Exhaust Manifold bolt and all its studs along with nuts followed by removing the Exhaust Manifold for discarding its gasket. A new Exhaust Manifold Gasket should be placed onto the studs before it is possible to install the Exhaust Manifold. Screw on the Exhaust Manifold nuts along with studs and bolt while applying 30 nm (22 ft. Lbs.) torque. The Exhaust Manifold heat shield requires mounting onto the manifold before installing heat shield bolts which should be tightened to 10 nm (89 inch lbs.). Secure the two bolts connecting the exhaust crossover to the left Exhaust Manifold with torque setting at 18 nm (13 ft.lb.). Install the engine lift bracket while using bolt and nut to fasten it then tighten the bolt to 25 nm (18 ft. Lbs.). First fix the engine harness clip to the engine lift bracket before putting back the Spark Plug wire channel to the rocker cover and wiring Spark Plug Wires to their respective plugs. Install the oil level indicator together with its tube into position.