A rattling noise from the engine may indicate that the timing chain cassette is worn. Our technicians tell us that installing an updated cassette and timing chain tensioner should correct this concern.Google+
Car Problem Reports
Mercury Mountaineer Worn Timing Chain Cassettes May Cause Rattling Noise From Engine
Mercury Mountaineer Problem
Engines Affected: 4.0L V6, 4.0L V6 SOHC, 4.6L V8
Average Mileage: 134,833 mi (107,000 mi - 162,000 mi)
Visitor, 2002 Mercury Mountaineer, 4.6L V8, 115,000 mi
timing chain issuesrattling ect.
Visitor, 2002 Mercury Mountaineer, 4.6L V8, 145,000 mi
My Mountaineer makes a very high pitched annoying sound when I start it and the noise level increases as I push on the gas pedal and accelerate. I have been so curious as to what causes this and how to fix it. I have taken it into a garage, but they have said they didn't know what it is. Sometimes the noise will subside and I won't hear it for a few days, but typically it is very loud.
Visitor, 1998 Mercury Mountaineer, 4.0L V6, 142,000 mi
Constant rattling noise as though a chain is being pulled over a piece of tin.
rattles on startup, metallic like rattle of a heat sheild.