Exhaust Manifold Heat Shield - Rattles/Buzzes

Classification:
EM01-002

Reference:
ITB01-026

Date:
May 11, 2001

2000-2001 G20; EXHAUST MANIFOLD HEAT SHIELD RATTLE

APPLIED VEHICLES:
2000-2001 G20 (P11)

APPLIED VINS:
Vehicles built before JNKCP11A31T407086

APPLIED DATES:
Vehicles built before December 18, 2000

APPLIED ENGINE # S:
Engines built before 375737

SERVICE INFORMATION

If a rattle or buzzing noise is heard coming from the engine compartment, this may be due to loose or missing exhaust manifold heat shield bolts. The vibration of the loose heat shield against the exhaust manifold creates the rattle or buzzing noise.

Self-locking bolts are now available. Follow the procedure below to correct this incident, if it should occur.

SERVICE PROCEDURE

WARNING:
To prevent injury, use appropriate gloves when performing the procedure below.

1. With the engine running, find and identify the source of the rattle or buzzing noise.





2. If the noise is coming from the heat shield, check to see if bolts that fasten the heat shield to the exhaust manifold are loose or missing (see Figure 1). Remove all or remaining bolts.





3. Install replacement bolts (6 locations). The replacement bolt has partially flattened threads for increased resistance to loosening. See Figure 2 to identify replacement bolts.

CAUTION:
Do not install the replacement bolt into aluminum parts such as intake manifolds or cylinder heads. Due to the flattened thread design of the replacement bolt, it may damage the threads of tapped holes in aluminum parts.

4. Tighten replacement bolts (6 locations) to 5.1-6.4 N-m (0.52-0.66 kg-m, 46-57 in-lbs.).

5. Test-drive the vehicle to check if the rattle or buzzing noise has been eliminated.





PARTS INFORMATION





CLAIMS INFORMATION