KC-294

1/28/22, 2:40 PM
Article
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Mack Chassis - Granite 7 Series (GU, GU7, M058,
M746, M748) - Cracks, Breakage Or Fatigue Found
Around The Hood Guide - Vehicles Built From Feb
2010 Through 20 Nov 2017
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Internal Content
NOTE: This article covers the Granite 7 series ONLY. For Granite 8
series, refer to solution CBR-221.
The entire document should be reviewed and understood prior
to performing any repair procedures to determine if repair is a
viable option.
1. Parts
For this repair the following parts are required:
• 1 - 84752067 Left-hand backing plate install kit
• 1 - 84752065 Right-hand backing plate install kit
Each kit will contain hardware and the following three parts:
Hood Guide
Back Plate
Front Plate
2. Inspection
2.1. Before beginning any repairs, carefully inspect the hood
reinforcement at the rear of the hood on both the right and left
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• Cracks visible around the guide and backing plate will be secured
by the new part. An example is shown below:
• For a hood guide that has broken away from the hood, the hood
may be reused as long as the hole is not much bigger than the old
guide bracket. The new plates and guide will attach around the
damage:
• If there is any other damage to either side beyond what can
reasonably be repaired with the procedure below, replacement of
the hood is recommended.
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3. Old Backing Plate Removal
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3.1. Remove the Air Intake Grille
3.1.1. Remove the two screws located at the rear of the grille as
shown below
3.1.2. Pull the rear of the grille away from the hood, then slide the
grille toward the cab to disengage the front mounting tabs.
3.2. Remove the old backing plate if it is still attached to the
hood.
3.2.1. Unbolt the three mounting bolts for the plates.
3.2.2. Grind off or drill out the two rivets holding the plate in
position.
3.2.3. Remove the backing plate through the air intake opening.
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4 Hood Preparation
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4. Hood Preparation
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4.1. Mark the hood for new holes to be drilled.
4.1.1. Obtain a new (updated) backing plate and front plate.
4.1.2. Insert the backing plate through the air inlet opening. Hold
the plate in its installation position.
4.1.3. Put the new front plate into position on the underside of the
hood. Temporarily bolt the front plate the back plate using the
four center holes indicated below:
4.1.4. Prior to tightening the bolts or making any marks, ensure
the backing plate is in proper contact (flush) with all three of the
surfaces it will mount to as shown below:
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4.1.5. On the front plate, mark the position of all of the remaining
holes
4.1.6. On the backing plate, mark the two holes indicated below.
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4.1.7. Unbolt and remove the front and back plates
4.2. Drill holes for the new backing and front plate mounting
hardware.
IMPORTANT
Care should be taken not to pierce the outer hood skin when
performing the operation below.
4.2.1. From the inside of the air intake plenum, drill two pilot holes
through the marks made in 4.1.6
• A long drill bit or a drill bit with a bit extension is
recommended.
4.2.2. Locate the pilot holes on the underside of the hood (the
opposite side from which the pilot holes were drilled).
4.2.3. Drill two 12 millimeter holes through the pilot holes.
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4 2 4 Drill 9 millimeter holes for the five marks made from the
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4.2.4. Drill 9 millimeter holes for the five marks made from the
front plate.
5. Reassemble the hood guide with the new
backer plate.
5.1. Insert the new backing plate through the air intake
opening and into install position
5.2. Using five of the bolts included with the installation kit,
secure the front plate to the backing plate through the five
new holes drilled in 4.2.4.
5.3. 2 bolts and the 2 washers included in the kit should be
used to secure the backing plate through the 2 holes drilled in
4.2.3.
5.4. The 4 remaining bolts in the kit should be used to secure
the new hood guide to the plates.
6. Reinstall the Air Intake Grille.
6.1. Installation is the reverse of the removal steps described
in Step 2.
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Tags
hood
cracks
cracking
Related links and attachments
KC-294 REF KC-221
k49500021
mack
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