1995-1999 Buick Riviera Downpipe Torque Specs

3.8L V6

Applies to 1995, 1996, 1997, 1998, and 1999 Buick Riviera

Labor Time:2 hours

Torque Values (10 specifications)

Component	Nm	lb-ft	Notes
Cover Screws	12	9	—
⚠️ Flange Bolts	55	40	—
⚠️ Flange Bolts	54	40	Apply anti-seize
Hanger Bolts	23	17	—
Hanger Bolts	23	17	—
Heat Shield Bolts	16	12	—
⚠️ Manifold Nuts	39	29	Apply anti-seize
Mounting Bolts	31	23	—
⚠️ O2 Sensor	55	40	—
⚠️ O2 Sensor	54	40	Apply anti-seize to threads

The primary torque specification for downpipe on a 1995-1999 Buick Riviera is 12 Nm (9 lb-ft).

There are 10 torque specifications for downpipe on the 1995-1999 Buick Riviera 3.8L V6, covering all related fasteners and components.