2.5L V6 petrol engines Mazda 626 (5)
The engine block is cast iron, the removable cylinder head is cast aluminum alloy. The camshaft is mounted on the cylinder head, the force is transferred to the valves through rocker arms located on a common shaft.
This section details how to remove the engine and install it, and describes repair procedures without removing the engine from the vehicle.
Therefore, when engine overhaul procedures are considered, in the event that the engine is removed from the car, or it is being tested on the bench, many of the described operations will not be applicable.
Technical specifications
Cylinder diameter 83 mm Piston stroke 73 mm Volume 2.5 liters Cylinder numbering (from the timing belt to the gearbox): - back row 1–3–5 - front row 2–4–6 Cylinder...
Cylinder diameter 83 mm Piston stroke 73 mm Volume 2.5 liters Cylinder numbering (from the timing belt to the gearbox): - back row 1–3–5 - front row 2–4–6 Cylinder...
Top dead center of the first piston (TDC)
Top dead center is the highest point that each piston reaches while the engine is running. Typically, TDC is taken to be the highest point reached by piston N1 during...
Top dead center is the highest point that each piston reaches while the engine is running. Typically, TDC is taken to be the highest point reached by piston N1 during...
Cylinder Head Covers — removal and installation
Removal 1. Disconnect the negative battery cable. 2. If you are removing the rear cylinder head cover, remove the intake manifold. 3. Disconnect the spark plug wires and...
Removal 1. Disconnect the negative battery cable. 2. If you are removing the rear cylinder head cover, remove the intake manifold. 3. Disconnect the spark plug wires and...
Valve springs, retainers and seals
Replacement 1. Remove the camshafts. Remove the valve lifters from the faulty valves. 2. Remove the spark plugs from the cylinders that contain the faulty valves. 3. Set...
Replacement 1. Remove the camshafts. Remove the valve lifters from the faulty valves. 2. Remove the spark plugs from the cylinders that contain the faulty valves. 3. Set...
Timing belt and sprockets
Crankshaft timing marks The marks are indicated by arrows. Camshaft Timing Marks - Front Bank of Cylinder The marks are indicated by arrows. Camshaft timing marks - rear...
Crankshaft timing marks The marks are indicated by arrows. Camshaft Timing Marks - Front Bank of Cylinder The marks are indicated by arrows. Camshaft timing marks - rear...
Camshafts and tappets — removal, inspection and installation
Arrangement of camshaft bearing caps in order 1. Intake valve shaft covers 2. Exhaust valve shaft covers 3. Front of the engine 4. Rear of the engine The front head...
Arrangement of camshaft bearing caps in order 1. Intake valve shaft covers 2. Exhaust valve shaft covers 3. Front of the engine 4. Rear of the engine The front head...
Intake manifold — removal and installation
Removal 1. Release the pressure in the fuel system and disconnect the negative battery cable. 2. Drain the coolant. 3. Remove the air intake pipe. 4. Disconnect the...
Removal 1. Release the pressure in the fuel system and disconnect the negative battery cable. 2. Drain the coolant. 3. Remove the air intake pipe. 4. Disconnect the...
Exhaust manifolds — removal and installation
Caution! The engine must cool down completely. Removal 1. Disconnect the negative battery cable. 2. Lubricate the exhaust manifold mounts with penetrating oil. 3....
Caution! The engine must cool down completely. Removal 1. Disconnect the negative battery cable. 2. Lubricate the exhaust manifold mounts with penetrating oil. 3....
Cylinder heads — removal and installation
Removal 1. Disconnect the negative battery cable. 2. Drain the coolant. Disconnect the upper radiator hose from the pipe. 3. Remove the air intake pipes and air filter....
Removal 1. Disconnect the negative battery cable. 2. Drain the coolant. Disconnect the upper radiator hose from the pipe. 3. Remove the air intake pipes and air filter....
Front crankshaft oil seal
There are two methods for replacing the front crankshaft oil seal. You can remove the oil pump and knock out the seal (recommended method) or use the easier method...
There are two methods for replacing the front crankshaft oil seal. You can remove the oil pump and knock out the seal (recommended method) or use the easier method...
Oil pan — removal and installation
Removal 1. Disconnect the negative battery cable. 2. Raise and support the front of the vehicle. 3. Remove the lower engine shield. 4. Drain the engine oil and remove...
Removal 1. Disconnect the negative battery cable. 2. Raise and support the front of the vehicle. 3. Remove the lower engine shield. 4. Drain the engine oil and remove...
Oil pump — removal, inspection and installation
Removal 1. Remove the oil pan. 2. Remove the timing belt and crankshaft sprocket. 3. Unscrew 4 bolts (indicated by arrows) and remove the oil intake pipe. 4. Remove the...
Removal 1. Remove the oil pan. 2. Remove the timing belt and crankshaft sprocket. 3. Unscrew 4 bolts (indicated by arrows) and remove the oil intake pipe. 4. Remove the...
Rear crankshaft oil seal
Replacement 1. Remove the gearbox. 2. Remove the flywheel. 3. Cut off the seal protrusion with a knife. 4. Remove the oil seal using a screwdriver or a special tool. 5....
Replacement 1. Remove the gearbox. 2. Remove the flywheel. 3. Cut off the seal protrusion with a knife. 4. Remove the oil seal using a screwdriver or a special tool. 5....
Engine Mounts — inspection and replacement
Examination 1. Raise and support the front of the vehicle. 2. Inspect the rubber shock absorbers on the mounts for wear and damage and replace them if necessary. 3....
Examination 1. Raise and support the front of the vehicle. 2. Inspect the rubber shock absorbers on the mounts for wear and damage and replace them if necessary. 3....
This section is available on: russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian
More sections on repairs of other Mazda models
• Power unit: Petrol engines Mazda Familia 6 (1989-1994)
• Power unit: Petrol engines 2.0 l Mazda CX-5KE (2012-2017)
• Power unit: Petrol engine 1.3 l Mazda 121 (3) (1996-2003)
• Power unit: Petrol engines Mazda Familia 6 (1989-1994)
• Power unit: Petrol engines 2.0 l Mazda CX-5KE (2012-2017)
• Power unit: Petrol engine 1.3 l Mazda 121 (3) (1996-2003)
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