Exhaust Manifold - Lock Tab Installation
88pontiac02Number 84-6(Gasoline)-95 Date 3/88
Subject: EXHAUST MANIFOLD LOCK TAB INSTALLATION
1984 FIERO 2.5L CAMPAIGN ("HYBRID") ENGINE KIT (VIN CODE R)
The 1984 Fiero 2.5L campaign or "hybrid" engine has exhaust manifold bolt lock tabs installed. The 1984 Fiero original production 2.5L engine did not have exhaust manifold bolt lock tabs installed.
The lock tabs serve two purposes:
1.. Better allow relative movement of the exhaust manifold's end
headers between the cylinder head and the exhaust manifold bolts
2. They prevent the bolts from backing out of the cylinder head. This design provides improved manifold sealing to the cylinder head.
The lock tabs should not be disturbed unless servicing requires removal of the exhaust manifold. In this case, the lock tabs should be reinstalled as shown in the Illustration for proper manifold sealing to the head.