Use kit 2U3Z-6D256-BA (non-balance shaft engines) for: All 02 Explorer/Mountaineer, except engine codes 2G-960-AA and 2G-964-AA.Use kit 2U3Z-6D256-AA (balance shaft engines) for: Obtain the correct kit and follow the sheet supplied with the kit. Refer to the following Service Procedure for details. Required fasteners, primary timing chain, and front cover gaskets are also included. The kit includes an improved Primary Chain Tensioner and an updated Primary Chain Guide, Jackshaft, and Crankshaft Sprockets. Replace the Primary Timing Chain Tensioner, Chain Guide, Jackshaft, and Crankshaft Sprockets with a Primary Timing Chain Tensioner Kit. Service Bulletin: TSB 02-7-6 4.0L SOHC Timing Chain Rattle The common symptom of cassette or hydraulic camshaft failures is chain rattles which can be heard in front of the engine or at the back. Symptoms of camshaft tensioners and cassettes failure We do not recommend fixing the cassette problem on your own the access points to these components are unreachable without removing the engine from the car also, you need to purchase special tools to remove these components. Although this is a non-interference engine (meaning that the valves will never hit the pistons), it still creates expensive repairs for the owner.Ĭan you fix the Timing chain rattle on your own? The same noise problem can further develop into guide breakage, which may scatter debris on the engine and throw the valves and pistons timing off.Īnother cause of chain rattle is the oil sludge build-up on the hydraulic tensioner, which prevents the chain from getting the proper tension. The Teflon camshaft chain tensioners, called cassettes or guide rails, along with the hydraulic chain tensioner, keep proper pressure on the chains, thus keeping this complicated network of chains and countershafts in sync.ĭue to the weak design of the Teflon chain guides (cassettes), these guides have tendencies to stretch, resulting in the chain rattle. This shaft serves as a countershaft, allowing the left camshaft to drive the front crankshaft and the right camshaft to be driven from the rear timing chain. In the 4.0 design, Ford has optimized the use of an intermediate jackshaft.

The Ford 4.0 SOHC engine’s design is far different from other Over-Head-Cam V6 and V8 engines it optimizes using a crankshaft to drive both overhead camshafts using timing belts or chains directly. Hydraulic camshaft tensioners and cassettes failure. Below are the common issues of a Ford 4.0 SOHC Engine. In this article, you will be informed regarding the common problems of a Ford 4.0 SOHC V6. Crankshaft and Harmonic balancer slack and separation problem.Hydraulic camshaft tensioners and cassettes failure.

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