Engine Mechanical - 3.0L Duratec (4V): Overview Mazda Tribute I facelift

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1. Remove the clutch. Refer to CLUTCH .
2. Remove the bolts and the flywheel.
3. To install, reverse the removal procedure.

The 3.0L Duratec is a four-valve-per-cylinder, dual overhead camshaft engine. The engine uses a distributor-less ignition system with a separate coil located above each spark plug. The cylinder block is a two-piece design with the upper portion housing the cylinders, and a separate lower cylinder block containing the main bearing caps. Both sections are made of aluminum, with metal inserts for the bearing areas and caps. An aluminum oil pan bolts to the bottom of the lower cylinder block and to the transaxle to provide greater strength.

The camshafts are mounted in the cylinder heads and act against a roller follower to open and close the valves. A hydraulic lash adjuster is located on one side of the roller follower and the valve tip on the opposite end. The camshafts are driven off the front of each cylinder head by two chains (one each side). Both of the chains are driven by a single sprocket that is located on the crankshaft, just in front of the oil pump.

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1. Verify the customer's concern by operating the engine to duplicate the condition.
2. Inspect to determine if any of the following mechanical concerns apply: Visual Inspection Chart NOTE: Minor cracks in the V-grooved portion of the drive belt are considered normal and acceptable. If the drive belt has chunks missing from the ribs, a new drive belt should be installed. Install a new drive belt if any of the following conditions exist: rib chunk-out, severe glazing, frayed cords or other concerns.
3. Inspect for drive belt cracking/chunking/wear. V-Ribbed Serpentine Drive Belt With Cracks Across Ribs V-Ribbed Serpentine Drive Belt With Chunks of Rib Missing
4. If the concerns remain after inspection, determine the symptoms and go to the Symptom Chart.