Pontiac firebird 1968 - Page 552

FUEL TANK AND EXHAUST SYSTEM
8-11
CROSSMEMBER
ONE BOLT IS TO BE TIGHTENED
FINGER TIGHT WITH PARTS SEATED
BEFORE OTHER BOLT IS TIGHTENED!
TO PRESCRIBED TORQUE.
(L.H. SHOWN-R.H
75 MIN.
WITH 400 ENGINE
(4BBL RAM AIR)
EXHAUST
MANIFOLD
I /ONE NUT IS TO BE
/ 1 I TIGHTENED FINGER TIGHT
If / ^WITH PARTS SEATED
BEFORE OTHER NUT
[/ IS TIGHTENED
1— \ TO PRESCRIBED TORQUE.
VIEW A WITH 400 ENGINE
(4BBL RAM AIR)
78 MIN.
.88 MIN
I.OO MIN.
s
AUTOMATIC TRANS.
GEARSHIFT CONTROLS
VIEW C
PROPSHAFT
(REBOUND POSITION)
UNDERBODY
.88 MIN.
DUAL EXHAUST f
SINGLE REINFORCEMENT
EXHAUST (CONVERTIBLE ONLY)
VIEW E
ONE BOLT IS TO BE TIGHTENED
FINGER TIGHT WITH PARTS SEATED
BEFORE OTHER BOLT IS TIGHTENED
TO PRESCRIBED TORQUE.
©30 LB.FT.
VIEW A WITHOUT 400 ENGINE
(4BBL RAM AIR)
VIEW B WITHOUT 400 ENGINE
(4BBL RAM AIR)
Fig. 8-13 Firebird Single or Dual Exhaust System
moving exhaust pipe and assembly rearward.
3. Loosen front U-bolt clamp on muffler and re-
move exhaust pipe.
4. Loosen tailpipe to muffler support U-bolt clamp
and remove muffler.
5. To install, reverse removal procedure. Tighten
tailpipe to muffler support U-bolt clamp 18 lb. ft.
torque. Tighten front U-bolt clamp on muffler 18
lb. ft. torque. Tighten crossover to exhaust pipe
U-bolt 33 lb. ft. torque.
NOTE: Coat inside diameter of front muffler
opening, outside diameter of crossover to exhaust
pipe flange, and inside diameter of tailpipe to
muffler flange with sealer before installing.
Tailpipe—Remove and Replace
1. Loosen front (behind muffler) and rear tailpipe
support clamps, on Firebird models tailpipe must be
cut off of muffler, it is a welded connection.
2. Slide tailpipe off rear of muffler and remove.
3. To replace tailpipe, reverse above procedure.
Tighten tailpipe front support clamp (behind muffler)
18 lb. ft. torque. Tighten tailpipe rear support
clamp 8 lb. ft. torque.
NOTE: Coat inside diameter of tailpipe flange
with sealer before installing.
DUAL EXHAUST SYSTEM—(Figs. 8-13 and 8-14)
Exhaust Pipe—Remove and Replace
1. Loosen front (behind muffler) and rear (at
resonator) tailpipe support U-bolt clamps.
2. Separate tailpipe from muffler.
3. Loosen front muffler U-bolt clamp and remove
muffler.
4. Disconnect exhaust pipe from manifold and
remove.
5. To install exhaust pipe, reverse removal pro-
cedure. Tighten exhaust pipe to manifold bolts 33
lb. ft. torque. Tighten front muffler U-bolt clamp
18 lb. ft. torque. Tighten front (behind muffler) tail-
pipe support U-bolt clamp 18 lb. ft. torque. Tighten
rear (at resonator) tailpipe support U-bolt clamp
33 lb. ft. torque.
NOTE: Coat inside diameter of front muffler
opening and tailpipe flange with sealer before in-
stalling muffler.
Muffler—Remove and Replace
1. Loosen front (behind muffler) and rear (at
resonator) tailpipe support U-bolt clamps.
2. Separate tailpipe from muffler.
3. Loosen front muffler U-bolt clamp and remove
muffler.