Mariner 4WD V6-3.0L (2010)
Camshaft Bearing: All Technical Service Bulletins
Engine - Knock/Thump From L/H Cylinder Head
TSB 10-12-3
07/05/10
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)
