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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:

(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 IK1600265 — Hood Guide Installation

iKNow Article IK1600247 - Hood Gap and Alignment Tolerances

SYMPTOM(s)

During vehicle movement, the engine hood may squeak, rattle, knock, and or bounce.

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

[Required Notes

Part Description Part Number

IBRACKET, SUPPORT,

HOOD, LH 3810978C5 |

IBRACKET, SUPPORT,

HOOD, RH 3810979C5 |

IBOLT, TORX FLAT HD

IM10-1.5 X 30 3811528C1 perside |OK to reuse originals

IGREASE, HEAVY

CHASSIS: /ARIOUS As needed |Purchase locally

Not available through the parts

GREASE, MEDIUM 4097990R1- (As needed |catalog. Ref: Dow Corning Molykote

ICHASSIS (Optional) ‘4A00GMKK

44 Medium
RIVET, 3/16" BLIND
ALUM - 5"-.625" GRIP |552870C1 |2 May substitute
RUBBER, 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 IK1600247 - 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 Yes. Apply heavy chassis grease to
both hood stops and hood guides
#1 (Left/Right) per repair steps below
IDoes the hood squeak or rattle during vehicle operation?
INo. No action required
Step) Action for for Issue #1 Decision
DIAGNOSTIC: Hood Squeaking and or rattling Yes. Install rubber spacers to hood
guides on the hood where they meet
ithe hood stops per the repair steps
#1A |Does the hood squeak or rattle during vehicle operation after newly added |below (Left/Right)
heavy grease is applied?
INo. No action required
Step) Action for Issue #2 Decision
DIAGNOSTIC: Hood Bounce & Knocking 1. Install rubber spacers to hood
guides on the hood where they meet
ithe hood stops per repair steps below:
#2 |Does the hood bounce and knock during vehicle operation? (Left/Right)
2. No action is required

ZBI
Left Hood Stop

Right Hood Stop

Right Hood Stop Guide

il

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

REPAIR STEP(s)

| Hood Stop - Greased ji Right Hood Stop Guide - Greased
y: Heed Stop Grassed | ; .

[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