Engine - Under Hood Rattle/Tapping Noise
TECHNICALBulletin No.: 08-06-01-019A
Date: May 17, 2011
Subject: Rattle/Tapping Type Noise Heard Under Hood (Diagnose and Replace Engine Oil Tank Transfer Tube Seal (O-Ring))
Models:
2006-2012 Chevrolet Corvette Z06
2009-2012 Chevrolet Corvette ZR1
2010-2012 Chevrolet Corvette Grand Sport (with RPO Z52)
Equipped with 6.2L or 7.0L Engine (VINs R, T, W, E - RPOs LS9, LS3, LS7)
Supercede:
This bulletin is being revised to add the 2010-2012 model years and the Grand Sport model. Please discard Corporate Bulletin Number 08-06-01-019 (Section 06 - Engine/Propulsion System).
Condition
Some customers may comment on a rattle or tapping type noise that is heard under the hood at just above idle, usually 1200 to 2200 RPM. In some cases, this noise may also be heard on the inside of the vehicle and be more pronounced on the passenger side.
Cause
This noise may be caused by the internal transfer tube in the engine oil tank hitting the inside of the tank cover. The seal (O-ring) that secures the tube in place may split and slide down the tube allowing the tube to be loose.
Correction
Diagnose the noise by raising the vehicle on a hoist and holding the throttle at about 1500 RPM to duplicate the condition. Use a stethoscope or chassis ears and place them on the side of the engine oil tank. If the noise is detected, perform the procedure outlined below. If the noise is not detected, continue following published diagnostics in SI.
1. Remove the engine oil tank from the vehicle. Refer to the Oil Tank Replacement procedure in SI.
2. Remove the eight bolts that secure the tank top.
3. Separate the tank. Inspect the seal (O-ring) for proper position and damage. Replace the seal (O-ring) if damaged with P/N 24576940.
4. Reinstall the tank top and secure with the eight bolts.
5. Install the engine oil tank into the vehicle. Refer to the Oil Tank Replacement procedure in SI.
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table.
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