Filed Under (Ford Manuals) by admin on 25-01-2012
3.0L INTERMITTENT CYLINDER HEAD CAMSHAFT KNOCK/THUMP NOISE This article supersedes TSB 09-11-6 to update the b. Isolate noise to LH – Listen to the cylinders Service Procedure and Part List. 4 and 6 valve cover fasteners (number 6 is by the coolant pump). There will be a ISSUE significant difference in transmitted noise Some 2009 Escape and Mariner vehicles, equipped between the cylinder 4 and 6 fasteners with 3.0L engine, may exhibit an intermittent when noise is present. Noise from LH – go knocking or thumping type noise from the cylinder to Step 4. head. After engine temperature reaches 210-220 °F NOTE (99-104 °C), the noise is typically heard from the THE RH AND LH NOISES HAVE DIFFERENT rear of the engine as the vehicle comes to a stop. CAUSES. FOLLOW ALL STEPS CAREFULLY FOR An example would be coming to a stop at the end PROPER DIAGNOSIS AND REPAIR. of a highway exit ramp. Noise will continue 45-60 seconds and then diminish. Noise will occur again 3. Replace the RH cylinder head per Workshop once engine reaches 210-220 °F (99-104 °C) and Manual (WSM), Section 303-01B. vehicle comes to another stop. a. Verify repair by repeating Step 2. If noise is ACTION still present then proceed with normal Follow the Service Procedure steps to correct the engine NVH diagnostics per WSM, Section condition. 100-04. SERVICE PROCEDURE 4. Remove LH valve cover. Refer to WSM, Section 303-01. 1. Is noise a 45-60 second knock/thump from a hot engine as the vehicle comes to a stop? a. Rotate the engine clockwise until cylinder number 6 exhaust cam lobes are pointing a. Yes – Go to Step 2. up and valves are fully closed. Exhaust camshaft needs to be left in this position for b. No – Stop as this procedure does not apply. all bearing caps in Step 4b. (Figure 1) Proceed with normal Workshop Manual (WSM), Section 100-04 diagnostics. 2. Using Chassis Ears, isolate the noise to Right Hand (RH) (Bank 1) or Left Hand (LH) (Bank 2) cylinder head. Noise is typically heard as 45-60 second knock/thump as the vehicle comes to a stop after engine reaches 210-220 °F (99-104 °C). a. Isolate noise to RH – Listen to the cylinder head by the variable camshaft timing (VCT) solenoid connectors. There will also be a vibration felt at the VCT solenoid connector when noise is present. Noise from RH – go to Step 3.