Engine - Knock/Thump From L/H Cylinder Head
TSB 10-12-307/05/10
3.0L INTERMITTENT LEFT CYLINDER HEAD
CAMSHAFT KNOCK/THUMP NOISE - BUILT ON OR
BEFORE 5/31/2010
FORD:
2010 Escape
MERCURY:
2010 Mariner
This article supersedes TSB 09-26-2 to add a production fix date.
ISSUE
Some 2010 Escape and Mariner vehicles equipped with 3.0L engine and built on or before 5/31/2010 may exhibit an intermittent knocking or thumping type noise from the left cylinder head. After engine temperature reaches 210-220 °F (99-104 °C), the noise is typically heard from the rear of the engine as the vehicle comes to a stop. An example would be coming to a stop at the end of a highway exit ramp. Noise will continue 45-60 seconds and then diminish. Noise will occur again once engine reaches 210-220 °F (99-104 °C) and vehicle comes to another stop.
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
1. Is noise a 45-60 second knock/thump from hot engine as vehicle comes to a stop?
a. Yes - Go to Step 2.
b. No - Stop. This procedure does not apply. Proceed with normal diagnostics per Workshop Manual (WSM), Section 100-04.
2. Using Chassis Ears listen to the cylinder 4 and 6 valve cover fasteners (6 is by the coolant pump). Is there significant difference in transmitted noise between the cylinder 4 and cylinder 6 fasteners when noise is present?
a. Yes - Go to Step 3
b. No - Stop. This procedure does not apply.
Proceed with normal diagnostics per Workshop Manual (WSM), Section 100-04.
3. Remove left hand (LH) valve cover. Refer to WSM, Section 303-01B.
4. Rotate the engine clockwise until cylinder number 6 exhaust cam lobes are pointing up and valves are fully closed. Exhaust camshaft needs to be left in this position for all caps in Step 5. (Figure 1)
NOTE
EACH CAM CAP MUST BE COMPLETELY REMOVED AND INSTALLED, PER INSTRUCTIONS, BEFORE PROCEEDING TO NEXT CAM CAP OR DAMAGE TO THE ENGINE MAY OCCUR.
5. On the LH exhaust camshaft only, starting at the front of the engine with the thrust bearing cap (1L), perform the following on all 5 camshaft bearing caps: (Figure 2)
a. Loosen both bolts.
b. Remove cap.
c. Install cap and push cap toward intake camshaft while tightening bolts, excludes thrust bearing cap (1L).
d. Torque bolts to 89 lb-in (10 N.m) starting with bolt closest to intake camshaft.
e. Proceed to next cam cap.
NOTE
CYLINDER HEAD CAMSHAFT BEARING CAPS MUST BE ASSEMBLED IN THEIR ORIGINAL POSITIONS AND ORIENTATION. FAILURE TO INSTALL THE CAMSHAFT BEARING CAPS IN THEIR ORIGINAL POSITIONS AND ORIENTATION MAY RESULT IN SEVERE ENGINE DAMAGE.
6. Install the LH valve cover. Refer to WSM, Section 303-01B.
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
101203A 2010 Escape, Mariner 3.0L 1.7 Hrs.
Engine: Remove The LH
Valve Cover, Remove And
Install LH Exhaust
Camshaft Bearing Caps.
Includes Time To Road
Test And Diagnose. (Do
Not Use With Any Other
Labor Operations)
DEALER CODING
CONDITION
BASIC PART NO. CODE
6049 07
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