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How's it going guys,

I've never had a chance to work on the ungodly fast GNX until a few days ago, so I'm pretty excited to post up a DIY article regarding the turbocharger replacement :cool:

Here is a guide to replacing the turbocharger on a '87 Buick Regal GNX:


1) Disconnect the exhaust inlet and outlet pipes from the turbocharger.

2) Disconnect the oil feed pipe from the center housing.

3) Remove the nut attaching the air intake elbow to the carburetor and remove the elbow and flex tube from the carburetor.

4) Disconnect the accelerator, cruise and detent linkages from the carburetor.

5) Disconnect the plenum linkage bracket.

6) Remove the two bolts attaching the plenum to the side bracket.

7) Disconnect the fuel line and all vacuum lines from the carburetor.

8) Drain the cooling system.

9) Disconnect the coolant lines from the front and rear of the plenum.

10) Disconnect the power brake vacuum line from the plenum.

11) Remove the two bolts attaching the turbine housing to the intake manifold bracket.

12) Remove the two bolts attaching the EGR valve manifold to the plenum. Loosen the two bolts attaching the EGR valve to the intake manifold.

13) Remove the air bypass hose from the check valve.

14) Remove the three bolts attaching the compressor housing to the intake manifold.

15) Remove the turbocharger, actuator, carburetor and plenum from the engine.

16) Remove the six bolts attaching the carburetor and plenum to the turbocharger and actuator.

17) Remove the oil drain from the center housing.


-Installation-


1) Install the oil drain on the center housing. Tighten to 15 ft. lbs. (19 Nm).

2) Install the six turbocharger/actuator-to-carburetor/plenum bolts.

3) Place the assembly on the engine and connect all vacuum hoses.

4) Install the three bolts attaching the compressor housing to the intake manifold. Tighten the bolts to 35 ft. lbs. (45 Nm).

5) Install the air bypass hose.

6) Loosely install the two bolts attaching the EGR valve manifold to the plenum.

7) Tighten the two bolts attaching the EGR valve to 15 ft. lbs. (19 Nm). Tighten the EGR manifold-to-plenum bolts to 15 ft. lbs. (19 Nm).

8) Install the two bolts attaching the turbine housing to the intake manifold bracket. Tighten the bolts to 20 ft. lbs. (26 Nm).

9) Connect the power brake vacuum line at the plenum. Tighten to 10 ft. lbs. (13 Nm).

10) Connect the plenum front bracket and install one bolt attaching the bracket to the manifold. Tighten the bolts to 20 ft. lbs. (26 Nm).

11) Connect the coolant hoses to the plenum.

12) Refill the cooling system.

13) Connect the carburetor fuel line and remaining vacuum hoses.

14) Install the two bolts attaching the plenum to the side bracket. Tighten the bolts to 20 ft. lbs. (26 Nm).

15) Connect the linkage bracket to the plenum. Tighten to 20 ft. lbs. (26 Nm).

16) Connect the accelerator, detent and cruise linkages to the carburetor.

17) Install the nut attaching to the carburetor.

18) Install the nut attaching the air intake elbow to the carburetor. Tighten to 15 ft. lbs. (19 Nm).

19) Connect the oil feed pipe to the center housing. Tighten the bolts to 7 ft. lbs. (9 Nm).

20) Connect the inlet and outlet pipes to the turbocharger. Tighten to 14 ft. lbs. (18 Nm).



*diagram courtesy of gmpartsgiant.com; all rights reserved
 
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