Cooling System - Coolant Loss from Cylinder Head
INFORMATIONBulletin No.: 11-06-02-001
Date: June 06, 2011
Subject: Information on Coolant Loss from Cylinder Head Coolant Bleed Passage
Models:
2006-2011 Holden VE Sedan, VE Sportwagon, VE UTE, WM Sedan
2008-2009 Pontiac G8
Equipped with Gen IV V8 Engine (RPOs LS3, L76, L77, L98)
In the Gen IV V8 engine, the coolant air bleed passage at the top rear of the cylinder heads was previously sealed with a bolt-on aluminum cover block. As a running change, the coolant air bleed passage opening was revised. It is now sealed with a rivet plug, which is essentially a solid soft aluminum "pop" rivet.
If one of these plugs is to be replaced in service, the early style aluminum cover blocks should be fitted in place of the rivet plug.
Figures 1 and 2 below show the newer design 'rivet plug' in the assembled position.
In the event of a leak from the rivet plug, the early design coolant air bleed cover (313) and bolt (312) should be installed to repair the leak.
Parts Information
