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Title: LT Hood Squeak, Rattle and Bouncing

Applies To: LT RH Hood Service

CHANGE LOG

Please refer to the change log text box below for recent changes to this article:

(06/11/2024 - Added rubber hose option as alternate repair
(04/23/2024 - Add P/N for grease
(03/29/2024 - Initial Article Release

DESCRIPTION

This document will guide the user through Various field repairs to eliminate the squeaks, rattles, knocking, and/or bouncing of the
engine hood on International LTs and International RHs. For any other hood alignment or adjustment issues please refer to the
current truck service manual for LT and RH for the proper procedures.

REFERENCE DOCUMENTS

iKNow Article |K1600265 — Hood Guide Installation

iKNow Article |K1600247 - Hood Gap and Alignment Tolerances

SYMPTOM(s)

The engine hood may squeak, rattle, knock, and/or bounce during vehicle movement.

Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):

N/A - There are no trouble Codes or Indicator Lights for this symptom.

Customer Observations or Concerns:

The driver may experience excessive noise or see excessive movement of the engine hood during vehicle operation. The noises or
movements do not create a safety concern but are merely an annoyance to the occupants of the truck as long as both hood latches

are properly engaged.

SPECIAL TOOL(s) / SOFTWARE

SERVICE PARTS INFORMATION

Quantity

Requirea Notes

[Part Description [Part Number

IBRACKET, SUPPORT,

HOOD, LH 3810978C5 |

BRACKET, SUPPORT,

HOOD, RH 3810979C5 |

BOLT, TORX FLAT HD

IM10-1.5 X 30 3811528C1 4 per side |OK to reuse originals

IGREASE, HEAVY /ARIOUS __ [As needed |Purchase locally

(CHASSIS
. Not available through the parts
creer ooteny 4097990R1 (As needed |catalog. Ref: Dow Corning Molykote
(Optional) 400GMKK 44 Medium
RIVET, 3/16" BLIND ,
IALUM - .5" -.625" GRIP 552870C1 |2 May substitute
IRUBBER, MUD FLAP
STRIP - 1/4" THK, 1" N/A 1 Fab in house

2.5"

DIAGNOSTIC STEP(s)

Issue #1: Hood Noises — Squeaking or Rattling

Drive the truck over various road conditions to determine if the hood makes squeaking or rattling noises. The noises generally occur
when the truck is rocking over uneven surfaces at speeds generally over 5-10 MPH.

Issue #2: Hood Knocking and Bouncing

Drive the truck over various road conditions to determine if the hood knocks or bounces. The bounce condition can be seen at the top
of the hood where it meets the base of the windshield and generally occurs when the truck is moving at speeds of 45 MPH or higher.
When the hood starts to bounce it will normally create a knocking noise when it bounces against the hood stops.

IMPORTANT NOTE: Before completing any of the diagnostic steps below, verify that the hood is properly mounted and aligned per
iKNow Article |K1600247 - Hood Gap and Alignment Tolerances. Also verify the hood stops and hood latch hardware are properly
secured and that these parts are not loose, bent, or damaged. If so, replace the damaged/defective parts before proceeding.

Step} Action for Issue #1 Decision

DIAGNOSTIC: Hood Squeaking and or rattling

ca Does the hood squeak or rattle during vehicle operation?

Yes. Apply heavy chassis grease to both
hood stops and hood guides (Left/Right)
per repair steps below

No. No action required

‘Step| Action for for Issue #1

Decision

DIAGNOSTIC: Hood Squeaking and or rattling

#1A [Does the hood squeak or rattle during vehicle operation after newly added heavy
grease is applied?

Yes. Install rubber spacers to hood
guides on the hood where they meet the
lhood stops per the repair steps below
(Left/Right)

No. No action required

Step] Action for Issue #2

Decision

DIAGNOSTIC: Hood Bounce & Knocking

#2 Does the hood bounce and knock during vehicle operation?

1. Install rubber spacers to hood guides
jon the hood where they meet the hood
stops per repair steps below (Left/Right)

2. No action is required

5

Right Hood Stop

Left Hood Stop

lFigure 1: Hood Stops as mounted to the Cab

Left Hood Stop Guide Right Hood Stop Guide

|Figure 2: Hood Guides as mounted to the hood B-side

REPAIR STEP(s)

Hood Stop - Greased

[Figure 3: Newly added Grease to Hood Stops and Hood Guides

The standard repair for the hood bouncing and or knocking is to rivet a hand-fabricated rubber spacer onto both hood guides to fill
the space between the hood stop and the end of the hood guide when the hood is closed. (See Figure #4) Use a high-quality piece of
rubber such as a slice off of a mud flap. The thickness should be approximately 1/4" to 3/16” thick and approximately 1.0” X 2.5” in
size. (See Figure #5 Left side is shown, the right side is the opposite)

Left Hood Stop Guide with Spacer & Grease

Rubber Spacer

Figure #4: Rubber spacer riveted to hood stop guide with added grease

4X Radius

2.0” — 2.25”

1.0”

————__ L__

1/4”- 3/16” Thick Rubber Spacer

Figure #5: Rubber Spacer Fabrication Drawing