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.
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: 125,500 mi (107,000 mi - 142,000 mi)