Engine - Rattling/Scratching Noise From LH Cyl. Head
TSB 11-9-1509/28/11
5.0L ENGINE - METALLIC RATTLE OR SCRATCHING
TYPE NOISE FROM FRONT OF LEFT HAND
CYLINDER HEAD AT IDLE-BUILT ON OR BEFORE
3/31/2011
FORD:
2011 Mustang
2012 Mustang
2011 F-150
ISSUE
Some 2011 F-150 and 2011-2012 Mustang vehicles (excluding Boss) built on or before 3/31/2011 and equipped with a 5.0L engine may exhibit an intermittent metallic rattle or scratching type noise in the area at the front of the left hand (driver side) cylinder head at idle with the engine at operating temperature.
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
NOTE
NOISE IS NOT A TYPICAL UPPER ENGINE TICK OR TAPPING NOISE.
1. With the vehicle in park, start the engine and operate at idle allowing the engine to warm to normal operating temperature.
2. Using a mechanic's stethoscope or EngineEAR, evaluate area at front of left hand (driver side) cylinder head for metallic rattle or scratching type noise. Stethoscope or EngineEAR probe should be placed in the areas shown. (Figures 1 and 2)
3. Is the noise heard in the areas shown? (Figures 1 and 2)
(Place stethoscope on cylinder head oil galley.)
a. Yes - Replace the left hand primary tensioner and the left hand timing chain tensioner arm using the kit part number provided in this article. Refer to Workshop Manual (WSM), Section 303-01C, Camshaft-Left Hand , for removal and installation procedure.
b. No - Do not continue with this article. Perform normal diagnostics. Refer to WSM, Section 303-00.
NOTE
FAILURE TO REPLACE BOTH THE PRIMARY TENSIONER AND TIMING CHAIN TENSIONER ARM MAY RESULT IN OVERLOADING OF THE TIMING CHAIN AND UNDER CERTAIN CONDITIONS COULD LEAD TO TIMING CHAIN FAILURE.
Parts Block
WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.
OPERATION DESCRIPTION TIME
110915A 2011 F-150 5.0L: Replace 5.3 Hrs.
The Left Hand Timing
Chain Tensioner And
Tensioner Arm Includes
Time To Diagnose (Do Not
Use With Any Other Labor
Operations)
110915A 2011-2012 Mustang 5.0L: 5.4 Hrs.
Replace The Left Hand
Timing Chain Tensioner
And Tensioner Arm
Includes Time To
Diagnose (Do Not Use
With Any Other Labor
Operations)
DEALER CODING
CONDITION
BASIC PART NO. CODE
6L266 42
Disclaimer