Banks Power Chevy_GMC Trucks: Diesel ’82 - 93 6.2L Forced Induction- Sidewinder Turbo System (early-body) - Manual (Page 14)

14
InJecTIOn puMp adJusTMenT
To obtain the maximum available performance from your
BanKs 6.2 diesel sidewinder Turbo system, and to comply
with emissions requirements, it is necessary to make an
adjustment to the fuel injection pump. The pump adjustment
increases the fuel delivery capacity of the pump. This
adjustment is made by turning an internal screw, found
within the pump. Be sure to adjust the pump with the engine
and pump cold. The pump adjustment will provide a 30%
or greater increase in rear wheel horsepower. suitable for
general use, work trucks and towing.
nOTe: exhaust gas temperature must not exceed 1100°f,
as indicated on the egT gauge (pyrometer) furnished with
the kit. If the egT approaches this temperature under heavy,
uphill load, the fuel pump capacity adjustment must be
reduced.
The pump adjustment can easily be set with the pump on
the vehicle. If the condition of the pump is in question, or if
the pump is to be removed from the vehicle, gaLe BanKs
ENGINEERING can provide the addresses and phone numbers
of qualified association of diesel specialists (ads) pump
service shops.
PUmP AdJUSTmENT PROCEdURE
NOTE: The engine must be COLD before starting this
procedure.
NOTE: Utmost cleanliness should be exercised. Do NOT use
any rags during the adjustment procedure. The lint from the
rag can clog an injector. Lay all parts on clean newspaper
during the adjustment procedure.
VERY IMpORTANT:
specIaL InsTRucTIOns fOR InJecTOR puMp adJusTMenT
ON LATE MODEL 6.2L ENGINES
Late model (’89 and newer) 6.2L diesel engines may have a
plastic cap over the head of the guide stud. The position of
the guide stud is pre-set at the factory, and should not be
altered. On these models, adjust the pump as outlined in this
section with the exception of step numbers 4, 5, 6, and 7. for
these steps, follow the new step numbers: 4a, 5a, 6a, and 7a.
Make sure both battery ground cables are
disconnected. disconnect the wiring from the top
of the fuel injection pump cover. note their location for
reassembly.
place a drip pan under the rear of the engine to catch
fuel. clean the upper portion of the pump and guide
stud (allen-head bolt at the rear of the pump) with diesel
fuel or a parts cleaning solvent. See Figures
18 and 19. Do
nOT clean the pump while the engine is hot, as doing so may
damage the pump.
Remove the fuel return line from the pump cover.
Remove the top attaching bolt and loosen the lower
attaching bolt on the fast solenoid and place the solenoid
aside. Remove the pump cover bolts and remove the cover.
IMpORTanT: utmost care must be used to prevent damage.
Observe the position of the metering valve spring
over the top of the guide stud. This position must be
duplicated exactly during the reassembly. See Figure 18 .
Remove the allen-head guide stud and sealing washer
from the rear (outside) of the pump bowl. While
rocking the throttle lever toward the rear of the engine, lift
out the governor spring assembly. do not bend any springs or
linkages.
Rotate the engine slowly by hand, In a cLOcKWIse
dIRecTIOn OnLY, using a breaker bar, a short
extension and a 15 ⁄
16
” socket on the vibration damper bolt
to bring the allen screw into view in the inspection slot in
the bottom of the pump bowl (see Figure
19 ). On some
late model trucks, ie: 1986 and later, it may be necessary
to remove the front crankshaft pulley to gain access to the
vibration damper bolt. dO nOT aTTeMpT TO ROTaTe THe
engIne WITH THe sTaRTeR. using a
5 ⁄
32
” allen wrench, rotate
the screw 1 ⁄
4
turn, clockwise.
nOTe: The allen-screw turns fairly tightly, and is self-locking.
Turning the screw clockwise adds fuel. Keep track of your
adjustments.
Reassemble the governor spring assembly and guide stud
(see Figure
18 ). Replace the sealing washer, available
from gM, if needed. Make sure the upper extension of the
metering valve spring rides atop the guide stud. Torque down
the guide stud snugly (85 inch-pounds).
using a syringe or similar means, remove as much
diesel fuel as possible from the injector pump housing.
This will make it easier to view the allen-head adjustment
screw through the slot in the bottom of the pump housing
when it is rotated into position.
Rotate the engine slowly by hand, In a cLOcKWIse
dIRecTIOn OnLY, using a breaker bar, a short
extension and a 15 /
16
” socket on the vibration damper bolt
to bring the allen screw into view in the inspection slot in
the bottom of the pump bowl (see Figure
19 ). On some
late model trucks it may be necessary to remove the front
crankshaft pulley to gain access to the vibration damper bolt
to turn the engine over. dO nOT aTTeMpT TO ROTaTe THe
engIne WITH THe sTaRTeR. The allen head screw may be
hard to see — a flashlight or shop light may help. The screw
will have to be adjusted at an angle from under the guide
stud/spring assembly.
using a 5 ⁄
32
” ball-end style allen wrench, rotate the
screw 1 ⁄
4
turn, clockwise. NOTE: The Allen-screw turns
fairly tightly, and is self-locking. Turning the screw clockwise
adds fuel. Keep track of your adjustments.
go to step 8 and continue with pump reassembly.
1.
2.
3.
4.
5.
6.
4a.
5a.
6a.
7a.
p.n. 96291 v.3.0