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The 4.0 SOHC engine was notorious for the OEM timing chain guides and tensioners breaking, resulting in timing chain rattle or "death rattle". This problem can occur as early as 45,000 mi (72,000 km) in some vehicles. Due to the SOHC engine's unique design involving both front and rear timing chains, the repair of the timing guides would often ...
Furthermore, in engines where the timing belt drives the water pump, failure of the water pump can cause the pump to seize, which can break the timing belt or chain. For this reason, timing belts and chains are often sold as part of a kit with the water pump, tensioner, and idler pulleys so that these parts can be replaced to prevent timing ...
The truck engines had unique parts including pistons for different compression ratios from the car engines, truck specific intake and exhaust manifolds, camshaft with more lift, and timing set that did not retard the camshaft timing. The strengthened engine block was introduced to the Ford cars for the 1978 model year. [20]
The 4.0 L SOHC V6 engine found on second, third, and fourth generation Explorers was notorious for the plastic OEM timing chain guides, cassettes, and tensioners breaking resulting in timing chain ticking, rattle or "death rattle". This problem can occur as early as 45,000 mi (72,000 km) in some vehicles.
For twin-cam or DOHC engines, VCT was used on either the intake or exhaust camshaft. (Engines that have VCT on both camshafts are now designated as Ti-VCT.↓) The use of variable camshaft timing on the exhaust camshaft is for improved emissions, and vehicles with VCT on the exhaust camshaft do not require exhaust gas recirculation (EGR) as retarding the exhaust cam timing achieves the same ...
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