Vmac VR70 User manual

V900089
2006 - 2007 GMC Classic C4500 - 5500
6.6L Duramax Diesel
www.vmacair.com
VR70 UNDERHOOD
AIR COMPRESSOR
INSTALLATION MANUAL

VMAC – Vehicle Mounted Air Compressors
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Installation Manual for VMAC
System V900089
General Motors 2006-2007 Classic
6.6L Duramax Diesel
C4500 – 5500
General Information..................................................................... 3
Before You Start ....................................................................... 3
Special Installation Notes ......................................................... 4
Part 1: Preparing for Installation............................................... 5
1.0 Preparing for Installation .................................................... 5
1.1 Dual Alternator Trucks........................................................ 7
Part 2: Installing the Main Bracket and Compressor.............. 9
2.1 Installing the Main Bracket ................................................. 9
2.2 Installing the Cooler............................................................ 11
Part 3: Installing the Tank and Hoses....................................... 13
3.1 Installing the Tank and Brackets ........................................ 13
3.2 Filling the System with Oil .................................................. 16
3.3 Completing the Installation ................................................. 16
Part 4: Installing the Control Components .............................. 24
4.1 Installing the Control Components ..................................... 25
4.2 Connecting the In-cab Wiring ............................................. 25
4.3 Connecting the Underhood Wiring ..................................... 27
4.4 Connecting the Power Supply Wire ................................... 28
4.5 Completing and Testing the Installation ............................. 28
Part 5: Finishing the Installation................................................ 30
5.1 Before Starting the Engine Checklist ................................. 30
5.2 After Starting the Engine Checklist..................................... 31
5.3 Setup, Performance Testing and Adjustments................... 32
5.4 System Identification and Warnings................................... 33
5.5 Auxiliary Air Receiver ......................................................... 34
Accessory Products from VMAC............................................... 35

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2
Document #1930101
Installation Manual for VMAC System V900089
General Motors 2006-2007 Classic 6.6L Duramax Diesel C4500 - 5500
Changes and Revisions
Version Revision Details Revised by/date Approved Implemented
00 Original manual IB 09 Sep 2005 BC 13 Sep 2005 16 Sep 2005
a Tank mount IB 14 Mar 2006 BC 15 Mar 2006 17 Mar 2006
b ECN 06-179 main brkt bolt IB 13 Aug 2006
c ECN 06-239 main brkt chng IB 24 Nov 2006 TG 29 Nov 2006 01 Dec 2006
d ECN 06-262 Control/inst IB 21 Dec 2006 TG 05 Jan 2007 08 Jan 2006
e ECN 07-70 belt # (RD) IB 19 Apr 2007 TG 24 Apr 2007 27 Apr 2007
Important Information
The information in this manual is intended for certified VMAC
installers who have been trained in installation procedures and for
people with mechanical trade certification who have the tools and
equipment to properly and safely perform the installation. Do not
attempt this installation if you do not have the appropriate
mechanical training, knowledge and experience.
Follow all safety precautions for underhood mechanical work. Any
grinding, bending or restructuring operations for correct fit in modified
vehicles must follow standard shop practices.
These instructions are a general guide for installing this system on
standard production trucks and do not contain information for
installation on non-standard trucks. This system may not fit special
order models or those which have had other changes without
additional modifications. If you have difficulty with the installation,
contact VMAC.
The VMAC warranty form is located at the back of this manual. This
warranty form must be completed and mailed or faxed to VMAC at
the time of installation for any subsequent warranty claim to be
considered valid.
To order parts, contact your VMAC dealer. Your dealer will ask for
the VMAC serial number, part number, description and quantity. To
locate your nearest dealer, call 1-800-738-8622.
Copyright 2007
All trademarks used in this manual are the property of the respective copyright holder.
The contents of this manual may not be reproduced in any form without the express
written permission of VMAC, 1333 Kipp Road, Nanaimo, BC V9X 1R3.
Printed in Canada

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General Information
Before You Start
Read this manual before attempting installation so that you can
familiarize yourself with the components and how they fit on the
vehicle. Open the package, unpack the components and identify the
parts. Identify variations for different model years or OEM options
that are listed in the manual.
All fasteners must be torqued to specifications. Use manufacturers
torque values for OEM fasteners. Apply Loctite 242 or equivalent on
all engine-mounted fasteners. Torque values are with Loctite applied
unless otherwise specified.
STANDARD GRADE 8 NATIONAL COARSE THREAD
Size 1/4 5/16 3/8 7/16 1/2 9/16 5/8 ¾
Foot-pounds (ft-lb) 9 18 35 55 80 110 170 280
Newton meter (N•m) 12 24 47 74 108 149 230 379
STANDARD GRADE 8 NATIONAL FINE THREAD
Size 3/8 7/16 1/2 5/8 ¾
Foot-pounds (ft-lb) 40 60 90 180 320
Newton meter (N•m) 54 81 122 244 434
METRIC CLASS 10.9
Size M8 M10 M12 M14 M16
Foot-pounds (ft-lb) 19 41 69 104 174
Newton meter (N•m) 25 55 93 141 236
Hose Coding
Different frame designations will affect the tank mounting position.
You may have to move the tank rearward from the standard position
on your application. If you must move the tank, the lines may be too
short. If this is the case, measure the hose shortfall and order a
Hose Extender Kit. The following table shows the color code used
by VMAC to define the different hose diameters.
Hose Diameter Colour-Coded Label
1/4 inch
5/16 inch
1/2 inch
5/8 inch
3/4 inch
1 inch
Yellow
Orange
Blue
Blue
Green
Green

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Special Installation Notes
The following special tools are required:
•36 mm 12 point 1/2 inch drive socket for removing the OEM
crankshaft bolt
•crankshaft locking tool (GM #J-44643) or VMAC equivalent
(Part #5900010)
•VMAC crankshaft pin extraction tool (Part #5900076) or
equivalent
The following additional materials are recommended:
•assorted sizes of fireproof protective plastic loom
•assorted lengths of nylon tie-straps
An alternate tank mounting system using frame hangers is available.
Contact VMAC to order the tank mount bracket accessory pack.

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Part 1: Preparing for Installation
1.0 Preparing for Installation
Preparation for installation is very important. Missing an item can
cause problems in the installation or even damage to components.
Check off each item as it is completed so that you do not miss any
preparation steps.
□Disconnect the batteries.
□Drain the coolant.
□Disconnect the MAF sensor wire from the air cleaner and
remove the air cleaner assembly from the engine.
□If necessary on trucks with dual alternators, remove the plastic
centering lug from the back of the air cleaner housing (if
equipped).
□Remove the plastic inner fender liner on the passenger side.
□Disconnect the hoses from the coolant expansion tank,
disconnect the level sensor connector and remove the tank.
□Remove the top radiator hose from the radiator.
□Remove the OEM belt.
□On trucks with air conditioning, remove the four compressor
locating bolts, disconnect the wiring and move the compressor
out of the way.
□Remove the upper fan shroud. Remove the mount bolts from the
lower fan shroud, but leave the shroud in position.
□Remove the fan.
□Remove the passenger side intercooler tube and hoses.

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□Disconnect the heater hose from the front end of the metal
connector pipe and remove the bolt securing the tube to the cast
alternator bracket.
□Disconnect the electrical multi connector from the glow plug relay
by pulling out the slide lock under the wire harness. Remove the
two bolts locating the glow plug relay and move the relay out of
the way.
□Disconnect the throttle body heater wire and move the harness
out of the way
□Remove the fuel bleed valve and the glow plug mounting bracket
from the OEM alternator bracket. Disconnect the fuel line rail clip
securing the line to the alternator bracket and small L-bracket.
□Remove the bracket attaching the throttle body to the cast
alternator bracket. Discard the bracket and keep the fasteners.
□Bend the starter motor wire harness retaining bracket and clip
under the passenger side exhaust manifold up 45 degrees from
vertical.
□Remove the 5/8 inch heater return hose from the lower radiator
hose connection. Mark the hose 11 inches from the lower
radiator hose connection end, cut the hose and discard the 11
inch section.
□Remove the rock guard from under the truck (if equipped) and
remove the lower radiator hose.
□Remove all wire harness retainers from the OEM alternator
mount bracket.
□Remove the alternator (passenger side on dual alternator trucks)
and keep the bolts.
□Remove the OEM idler and tensioner from the alternator mount
bracket.
□Remove the OEM alternator mount bracket.

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□Install a crankshaft locking tool, remove the crank pulley bolt and
remove the crank pulley. If you are using the VMAC tool:
•put the socket on the nut
•put the single-pin end of the tool on the front of the pulley with
the locking tool hanging straight down
•put a short extension and long flex-bar on the socket
•turn the engine until the pin on the tool makes contact and the
tool jams against the protruding center-piece of the cross-
member under the front of the engine.
□Remove the crankshaft pin. If you are using the VMAC extraction
tool:
•fit the split end of the tool (on the end of the shaft) over the
crankshaft pin and tap downward with the slide-hammer to
make sure that it is seated correctly
•tighten the pinch bolt securely
•use the hammer action of the slider in an upward motion to
remove the pin from the crankshaft
□Install the replacement crankshaft/harmonic balancer locating pin
and tap it home using a brass drift and a small hammer. Ensure
that the head of the pin is aligned with the crankshaft. You may
have to twist it into position (Figure 1.1).
□Apply a light wipe of oil to the inside of the OEM crank pulley and
install the pulley back onto the crankshaft.
1.1 Dual Alternator Trucks
□Loosen the top mounting bolt on the driver’s side alternator and
remove the lower mounting bolts.
□Install the bracket under the alternator and insert the mounting
bolts.
□Push the alternator upward and tighten all the bolts.

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8
High-strength
crank pin
Figure 1.1

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Part 2: Installing the Main Bracket
and Compressor
2.1 Installing the Main Bracket
□Remove the belt tensioner assembly from the VR main bracket.
□Remove the plastic caps and remove the two M10 x 85 mm low
profile socket head screws from the bracket. Place the bracket in
position on the front of the engine.
□Insert the two M10 x 85 low profile socket bolts and thread the
two OEM 10 mm flange nuts onto the two studs. Thread all
fasteners in just enough to hold the bracket in place (Figure 2.1).
Check the fit of the bracket against the engine to make sure that
it fits flat and has no obstructions, tighten the bolts evenly and
then torque them to specifications.
Install OEM
back idler here
M10 x 85 mm
socket head bolts
(one behind the VR tensioner
)
OEM 10 mm nuts
Install the OEM
tensioner here
Figure 2.1

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□Apply Loctite and install the VR tensioner, the OEM belt
tensioner and one OEM back idler.
□Install the alternator.
□Place the VR crank pulley in position with the two roll pins on
both sides of the counter balance weight of the OEM pulley
(Figure 2.2).
Position the roll pins here
Figure 2.2
□Thread the M18 x 100 mm center bolt with OEM washer into the
crankshaft. Install an engine-locking tool and torque the center
bolt to manufacturer’s specifications (usually about 250 ft-lbs
(340 N.m).
□Remove the inlet control valve from the compressor. Cover the
opening on the compressor with the supplied orange cap to
prevent contamination.
□Install the compressor on the bracket without the inlet valve and
thread in the two front M8 x 25mm bolts with serrated washers.
□Install the rear M8 x 20 mm bolt with serrated washer.

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□Torque the fasteners to specifications. Ensure that the
compressor is fully tightened down and secured. Make sure that
the bolt threads have not bottomed out in the holes.
□Install the inlet control valve.
□Attach the straight end of the short 1/2 inch hose to the fitting on
the side of the compressor with the hose routed over the top of
the compressor just behind the clutch assembly. Do not tighten
the fitting until the other end is connected to the cooler.
2.2 Installing the Cooler
□Remove the strap and the support bracket from the cooler
assembly (Figure 2.3).
□Move the lower fan shroud up to provide clearance and position
the cooler (from under the truck) on the inside of the U-channel
cross-member where the rock guard was located. Insert two 3/8
x 1 inch flange lock bolts through the rock guard mounting holes
into the cooler.
□Place the cooler support bracket on the two bolts with the center
hole facing toward the front of the vehicle, install flange lock nuts
on the bolts and torque to specifications.
□Pass the support strap through the hole in the top of the cooler
back plate, around the U-channel frame and through the support
bracket. Install a flat washer and 5/16 inch nut and tighten, then
install a second 5/16 inch nut as a lock.
□Cut the lower radiator hose at line “A”, “C” and “D” (Figure 2.4)
and discard the 1 inch end piece at “A” and the 12 inch section
from “C-D”.
□Install each hose section back to the original positions, between
the radiator and the cooler and the engine and the cooler.
□If necessary, trim the engine end at “B” for a proper fit.

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12
Su
pp
ort bracket
Cooler oil hose fittings
T
o eng
i
n
e
To radiator
Cooler
support
strap
Figure 2.3
To engine
To Radiator
To coolant
expansion tank
Heater hose
connection
7 1/2”
12”
A
C
1”
D B
1”
Discard
these
sections
Cut and discard
if necessary to fit
Figure 2.4

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Part 3: Installing the Tank and
Hoses
3.1 Installing the Tank and Brackets
The tank mounts under the driver’s side step (Figure 3.1).
Cut-out
step
brackets
C-clam
p
bolts
FRON
T
Tan k
Figure 3.1
□Remove the step from the truck. Place the supplied template on
the rear of the step back support panel and cut a half-crescent
section out of the lower part of the existing cut out section.
Repeat this operation with the front step support panel.
□Slide the two C-clamps over the front of the tank, position the
clamps at the front and rear of the tank and loosely install the
pinch bolts in the clamps.
□Pass the tank through the cut out section in the front step
support panel then align the tank through the rear cut-out in the
rear step support panel.

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□Position the tank so the C-clamps are set at the inside edge of
the bottom step panel and clear of the double-panel joints. Place
the tank mount spacers under the C-clamps and align the C-
clamp and spacer holes. Mark the location of the four holes.
□Remove tank and spacers; drill four 11/32 inch holes at the
marks, then install the step back onto the truck.
□Install the tank with the C-clamps and spacers, align the holes
and install the two outer M8 x 30 bolts and nuts. Tighten the
fasteners.
□Rotate the tank so that the “UP” arrow points upward and adjust
the position of the tank so that the front of the tank approximately
even with rear of front spring hanger.
□Tighten the two C-clamp bolts.
□Install the two inner M8 x 30 bolts, nuts and washers. Tighten the
fasteners.
□Install the two steel oil lines with the flexible hoses to the
matching fittings on the rear of the tank. Tie the two steel tubes
together with nylon ties.
□Locate the OEM hole in the driver’s side frame rail next to the M8
nut on the stud. Use the supplied M8 x 30 mm bolt, washer and
nut to attach the supplied L-bracket with the horizontal part at the
bottom facing the driver’s side of the truck.
□Fit the small tube retaining P-clip over the steel tubes and fasten
it to the L bracket using a M8 x 20 bolt, nut and washer.
□Thread the 45 degree end of the 1 inch hose onto the matching
fitting at the front of the tank. Position the fitting so that it is in the
front recess of the spring hanger and up as far as possible to
clear spring movement, but clear of the frame and spring hanger.
Tighten the fitting.
□Thread the straight end of the longest 1/2 inch hose onto the
matching fitting on the front of the tank. Route the hose up over
the inside of the driver side frame rail and over the steering box.

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□Thread the other end onto the driver’s side fitting on the oil
cooler. Tighten the connections and tie the hose to the brake
lines, clear of sharp edges.
□Route the 1 inch, 5/16 inch and 1/4 inch lines under the
transmission bell housing and over the transmission cooler lines
to the passenger side frame rail.
□On the driver’s side of the bell housing, first locate the two lower
bell housing bolts then locate the next higher bell housing bolt.
Remove this bolt and fit the second supplied L-bracket with the
“L” at the bottom facing forward.
□Install the insulated P-clip over the three hoses and secure them
to the L-bracket using a M8 x 20 bolt, nut and washer.
□Fasten the hoses together with nylon ties and fasten them to the
harness on the passenger side of the truck.
□Route all three hoses up the back of the shock tower and over
the outside of the frame rail to the compressor. Fit loom over
hoses where they rest on the frame.
□Connect the hoses to the matching fittings at the compressor
and tighten the fittings.
□Route the short 1/2 inch hose from the compressor over the
compressor gear case and down under the lower radiator hose
connection. Thread the 90 degree end onto the passenger side
fitting on the oil cooler and tighten the fitting.
□Remove the oil filter from the tank and remove the cardboard
protector.
□Apply a light coating of oil to the filter gasket and install the filter
on the tank. Tighten an additional 3/4 turn after the gasket
contacts the base.

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3.2 Filling the System with Oil
□Remove the fill plug and pour the supplied compressor oil into
the compressor, turning the center of the compressor clutch
clockwise to speed oil flow into the tank.
You must use VMAC compressor oil in this system.
Failure to use this special oil will result in damage to the
compressor and will void your warranty.
□Allow 5 minutes for the oil to drain into the tank, then check the
level at the sight glass at the front of the tank. Continue adding
oil until the level is correct.
Do not overfill the system.
3.3 Completing the Installation
□Release the OEM spring clip with the retaining tab located on the
wire harness under the passenger side exhaust manifold to the
starter. Move the clip up to the top of the heat wrap on the
harness and fasten the clip. Fit the clip to the tab attached to the
heater tube under the compressor, pulling the slack on the
harness up to provide adequate clearance for the wiring harness
around the compressor.
□Install the rubber-covered 7/8 inch P-clip around the heater tube
next to the main air discharge connection at the rear of the
compressor.
□Attach the brace bracket to the P-clip with a 1/4 inch NC bolt, nut
and washer. Attach the other end of the bracket to the threaded
hole on the top of the valve cover (Figure 3.2). Use one of the
OEM M8 bolts from the cast alternator bracket.
□Install the fan spacer onto the fan pulley.
!
!

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B
race
b
rac
k
et
1/4” NC bolt
M8 bolt
Figure 3.2
□Install the air conditioning compressor and the replacement belt.
•105 AMP alternator VMAC part #1610337 Gates K061150
•150 AMP alternator VMAC part #1630202 Goodyear
Gatorback belt 4061175 (extra belt with 150 amp alt)
•Dual alternator use OEM belt (Figure 3.4)
Alternator
A/C
OEM ribbed idler OEM back idler
OEM tensioner
Fan P/S
OEM crank pulley
Figure 3.3 Single alternator

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18
Al
ternator
OEM back idler
Alternator
OEM ribbed idler
OEM tensioner
OEM crank pulley
A/C
P/S
Fan
Figure 3.4 Dual alternator
□Install the lower fan shroud and fan, then install the upper fan
shroud.
□Install the small L-bracket with the welded nut to the rear
passenger side outer shroud 6 mm OEM bolt that joins the upper
and lower shroud halves (Figure 3.5).
□Drill a 1/4 inch hole in the side section of the passenger side
upper fan shroud. Install the relay that was attached to the rear
of the upper shroud in this new location.
□Install a rubber-covered P-clip around the heater hose connected
to the heater tube and fasten the P-clip to the L-bracket using the
10-32 button head screw to keep the hose away from the
compressor clutch.
□Install the supplied 5/8 inch hose barb connector to the cut
heater hose, then install the 14 inch length of supplied heater
hose between the hose barb connector and the lower radiator
hose connector.