Banks Power GM Motorhomes: (Gas ’96 - 00 7.4L Vortec) PowerPack system (EFI Vortec, P30 chassis) - Manual (Page 4)

threads with anti-seize compound to prevent galling and
install it onto the left TorqueTube manifold. (figure
2 )
inspect the exhaust mounting surfaces of the cylinder
heads and remove rust or carbon, which would
prevent the TorqueTube manifolds from sealing.
NOTE: Do not use the factory exhaust manifold gaskets upon
reinstallation. Banks torque tubes are machine surfaced and are
designed to seal without gaskets.
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.
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.
Open a number 56 hose clamp and thread it through
the slots on the oil filter heat shield. see figure
3.
position the heat shield on the oil filter to provide protection
from the closest manifold pipe, then tighten clamp.
place a conical seal in the flare on the headpipe
extension provided. attach the extension to the
right-side TorqueTube manifold with two 3 ⁄
8
-1 3 ⁄
4
” bolts and
3 ⁄
8
-inch washers provided. Tighten the bolts just enough to
hold the extension. slide a 3-inch muffler clamp onto the
extension pipe. slide the new banks headpipe assembly onto
the headpipe extension. Make a mark with the slip joint fully
seated, to verify the joint is fully seated when the clamp is
tightened. (see figure
4 )
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.
place the other conical seal onto the left-side of the
banks headpipe assembly. attach the assembly to the
left-side TorqueTube with two more 3 ⁄
8
-16 x 1 3 ⁄
4
” bolts and
3 ⁄
8
-inch washers provided. slip the new gasket between the
catalytic converter inlet flanges. install four 3 ⁄
8
-16 x 1 1 ⁄
2
” bolts
with washers and locking nuts into the oval-flange. Tighten
the bolts.
Tighten the bolts that attach the TorqueTube
manifolds to the headpipe assembly. Tighten the
3-inch exhaust clamp on the slip joint, making sure the slip
joint fully seats.
on each side of the transmission install a manifold-
to-headpipe heatshield. place the oxygen sensor
connector through the oblong hole in the heatshield. using
the
1 ⁄
4
-20 x 3 ⁄
4
” bolts, washers and crimp-lock nuts provided,
attach the heatshield to the tabs on the manifold and
headpipe.
plug the oxygen sensor extension leads provided into
the wiring harness, where each sensor was originally
located. plug the sensor lead into the headpipe extension.
secure the leads away from pipes and moving linkages with
the cable ties provided.
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.
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.
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.
4 p.n. 96373 v.3.0
FIGURE 3
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