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HDGENE
HDGENE, Ford Senior Master/Diesel/Trans
Category: Ford
Satisfied Customers: 4784
Experience:  25 years Auto experience, Ford ,GM, Chrysler, Asian & European
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2006 Ford Explorer. Clacking sound from engine - had plenty

Customer Question

2006 Ford Explorer. Clacking sound from engine - had plenty of oil. 137000 miles V6 engine. Sound is when in park or driving. increases when accelerated.
Submitted: 1 year ago.
Category: Ford
Expert:  HDGENE replied 1 year ago.

Hello, is this the 4.0 SOHC engine and is the noise coming from the engine area?

Customer: replied 1 year ago.
It is a 2003 Ford Explorer with a 4.0 engine. It sounds like the noise is coming from the engine. It has a metallic clacking sound.
Customer: replied 1 year ago.
It is not loud but very evident that something is not right.
Expert:  HDGENE replied 1 year ago.

Ok there are two differnt 4.0 engines an overhead valve OHV engine and a SOHC Single Overhead cam engine, just checking to see, if it is the SOHC engine it is most likely a noise from either one of the timing chains or an internal engine noise based on the mileage. All you can do is try to isolate the area of the noise to make sure it is not related to the engine itself.

Customer: replied 1 year ago.
SOHC. It has a regular sounding click/clacking. Sometimes the sound appears to be in the fromt of the engine, other times it sound like it is coming from the rear of the engine.
Customer: replied 1 year ago.
The clicks will accelerate as the car accelerates.
Expert:  HDGENE replied 1 year ago.

Ok yes, most likely a worn timing chain guide. this engine uses 3 timing chains. A timing chain in the left front cylinder head for the camshaft, a timing chain in the rear of the right cylinder head for the right side and a jackshaft chain in the lower center of the engine to run the left and right side timing chain. if the timing chain jumps time or breaks, it will bend valves in the engine and big bucks to repair. the whole engine must come out in order to do the timing chains since the right chain is accessed from the rear of the engine.