Banks Power GM Motorhomes: (Gas ’96 - 00 7.4L Vortec) PowerPack system (EFI Vortec, P12 chassis) User Manual
Page 5
p.n. 96393
apply a small amount of anti-seize on the threads at
the cylinder head end of each exhaust manifold stud.
lift the TorqueTube manifolds into place and install one or two
studs to position them. apply a small amount of anti-seize on
the threads of the egr fitting. on the left manifold, install the
egr tube onto the adapter fitting and tighten. reinstall the
remaining studs into the heads, and tighten the nuts. Make
sure that the single bolt reinstalls in the same location that it
came from.
replace the spark plugs, spark plug wire heatshields,
and spark plug wires. reinstall the dipstick tube and
o-ring into the oil pan. replace the retaining clip and reinstall
the dipstick.
place a conical seal in the flare on each headpipe and
attach the headpipes to the manifolds using the
3
⁄
8
” x
1
3
⁄
4
” bolts and
3
⁄
8
” washers provided. position a new headpipe
flange gasket between each of the 3-bolt flanges and attach
the headpipes to the converter inlet pipes with two
7
⁄
16
” x 1
1
⁄
4
”
bolts and washers and one
3
⁄
8
” x
1
⁄
4
” bolt and washer. Tighten
all the fasteners evenly.
apply a small amount of anti-seize to the threads of
the oxygen sensor bungs in the headpipes. Without
getting any anti-seize on the sensors themselves, install them
into the headpipe bungs. plug the sensors into their original
locations. it will be necessary to pull the wire loom out of
the frame connector on both sides of the vehicle to allow
adequate length.
disconnect the factory muffler and tailpipe from the
rear of the intermediate pipes. starting from the rear,
first remove the tailpipe and then the muffler. if the slip joints
will not come apart, heat the connections with a torch until
they separate. save all hardware and hangers, as some items
will be reused.
install the two short intermediate pipe extensions
onto the ends of the catalytic converter outlet
pipes. slide two 2
1
⁄
2
-inch exhaust clamps over each of the
intermediate extension pipes.
remove the factory frame hanger located at the back
of the muffler. bolt the supplied frame-rail hanger
mount into the holes in the frame adjacent to the muffler
outlet using two
1
⁄
2
-13x1” hex bolts, washers and crimplock
nuts. install one original rubber hanger onto the pin on the
new banks hanger mount.
NOTE: Due to differences in coach configuration, some
manufactures may eliminate the factory rubber tailpipe
hangers. The appropriate rubber hanger is available from
Gale Banks Engineering or any GM parts dealer. (P.N.
15641364)
install banks dynaflow® muffler onto the intermediate
extension pipes, with the unshielded portion of the
muffler facing the driveshaft. place the 3
1
⁄
2
”-inch hanger
clamp over the muffler outlet and insert the pin into the
rubber hanger.
Holding the muffler square and level to the vehicle
frame, tighten the clamps on the intermediate
extension pipes and the muffler inlets.
Note: Two tailpipe options are available to provide either a
right-exit or left-exit tailpipe. For left exit talpipes follow steps
29-34. For right exit tailpipes follow steps 34-40.
loosen but do not remove the 2 farthest forward
nuts on the left spring hanger mount. slip the frame
hanger bracket behind the nuts with the tab turning towards
the center of the vehicle, and retighten the nuts.
place the tailpipe into the muffler outlet and position
a stand under the tailpipe to support it level with the
vehicle. The end of the tailpipe extension should be even with
the outside edge of the lower body of the vehicle.
place the universal hanger supplied onto a 3.5”
muffler clamp and slide the clamp over the tailpipe
to a point directly below the frame hanger bracket. either
measure or mark the strap on the hanger even with the
bottom of the frame bracket previously installed. remove the
clamp and hanger from the pipe and make a 90 degree bend
in the strap at the measurement or mark.
place the clamp and hanger back onto the tailpipe
and attach the hanger to the frame bracket with the
3
⁄
8
x 1” bolt washers and nut provided. Make sure that the
tailpipe is level with the vehicle and tighten the 3.5” clamp.
tighten the clamp on the muffler outlet.
place the polished tip over the end of the tailpipe so
that the end of the tailpipe is approximately 1” inside
the tip. clamp the tip to the pipe with a 3.5” u-clamp.
if it is needed, a clamp-on tailpipe heatshield has
been provided. it is clamped with the remaining 3.5”
u-clamps to the tailpipe and may be trimmed to length if
necessary.
loosen but do not remove the 2 farthest forward
nuts on the right spring hanger mount. slip the frame
hanger bracket behind the nuts with the tab turning towards
the center of the vehicle, and retighten the nuts.
place the tailpipe into the muffler. position it so that
the heatshield is level with the floor of the vehicle and
tighten the clamp on the muffler outlet enough to hold the
pipe from falling onto the driveshaft.
32.
33.
34.
35.
36.
31.
30.
29.
28.
26.
25.
24.
23.
22.
21.
20.
27.
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