Exhaust Manifold Gasket - Leaks
Number 86-6 (Gasoline) - 45 Date 6/86Subject: EXHAUST MANIFOLD GASKET LEAKS
1985/86 FIERO WITH 2.8L MPFI V-6 ENGINE (VIN CODE 9)
EXHAUST MANIFOLD:
A CONDITION EXISTS WHEREBY THE STAINLESS STEEL SEAL RING OF THE EXHAUST MANIFOLD GASKET CAN SEPARATE FROM THE GRAPHOIL GASKET MATERIAL, CREEP TO THE EDGE OF THE EXHAUST MANIFOLD PORT FLANGE, AND CAUSE AN AUDIBLE EXHAUST LEAK. THE CONDITION IS CAUSED BY MOVEMENT OF THE EXHAUST MANIFOLD PORT FLANGE DURING HEATING AND COOLING CYCLES AND IS MOST OFTEN FOUND AT THE #1 OR THE #2 PORT.
TO CORRECT THIS CONDITION, REPLACE RIGHT AND LEFT BANK EXHAUST MANIFOLD GASKETS, P/N 10034334 WITH P/N 10051512 EXHAUST MANIFOLD GASKETS; REPLACE NINE P/N 10032112 BOLT AND LOCK WASHER ASSEMBLIES WITH NINE P/N 360584 BOLTS; REPLACE THREE P/N 10032191 STUD BOLT AND LOCKWASHER ASSEMBLIES WITH THREE P/N 373928 STUDS (REFER TO FIGURE 1). REFER TO SECTION 6A2, PAGES 12, 14 AND 15 OF THE SERVICE MANUAL FOR DISASSEMBLY AND REASSEMBLY INSTRUCTIONS.
USE APPLICABLE LABOR TIMES AND OPERATION NUMBERS.
1 - BOLT/STUD LOCKWASHER ASM. (L.H. ONLY) 24 N-m (18 FT.LB.) 2 - EXHAUST MANIFOLD ASM. R.H. 3 - BOLT - 30 N-m (22 FT.LB.) 4 - CROSSOVER PIPE 5 - SEAL
6 - MUFFLER 7 - SPRING 8 - BOLT 20 N-m (15 FT.LB.) 9 - BOLT & LOCKWASH E R ASM. 10 - EXHAUST MANIFOLD ASM L.H. 11 - GASKET