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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Mazda 626 (from 1991 to 1998, the year of issue)

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Mazda 626
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Mazda
626
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Petrol engines (1,6 and 1,8 liters)
Gasoline 4-cylinder engine (2 liters)
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A partition of engines (1,6 and 1,8 liters)
Bulkhead engine (2.0 liters and 2.5 V6)
Introduction
Specifications
4-cylinder engines
6-cylinder engines
Repair work without dismantle of the engine from the vehicle
Engine Overhaul
Check with a vacuum gauge
Compression Test
Methods for removing the motor
Removing and installing engine
ENGINE OVERHAUL
A partition and check of a head of cylinders
Valves
Assembling the cylinder head
Removal of pistons and rods
Removing the crankshaft
Checking cylinder
Honing cylinders
Check of pistons and rods
Checking crankshaft
Check and selection of radical bearings and bearings of rods
Check the camshaft and pushers
The order of assembly of the engine
Installation of the piston rings
Installing the crankshaft
Installing the crankshaft rear oil seal
Installation of pistons and rods
The diesel engine of 2.0 liters
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Heating and ventilation
Fuel system
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Specifications



Bore
82 mm
The piston stroke
90 mm
Volume
2.0 liters
Pressure cylinder compression:
- Nominal
171 psi
- Minimum
119 psi
The maximum allowable pressure difference between the cylinders
15 psi
The oil pressure (engine warmed up) at 3000 rev / min
57 - 71 psi
Cylinder head
The maximum allowable strain
0.05 mm
Valves and valve springs
The width of the rim of the valve:
- Intake
1.08 mm
- Exhaust
1.18 mm
The diameter of the valve stem:
- Intake
5,875 - 5,890 mm
- Exhaust
5,870 - 5,885 mm
The gap between the valve stem and guide bushing:
- Intake
0.025 - 0.060 mm
- Exhaust
0.075 - 0.162 mm
Valve spring:
- The maximum deviation from a right angle
1.5 mm
- The length in the free state
36 - 43 mm
Camshafts and valve lifters
The height of the cam shaft:
- Intake
42.30 mm
- Exhaust
42.66 mm
The maximum permissible wear
0.15 mm
The diameter of the bearing journal
25.53 - 25.56 mm
Maximum roundness
0.003 mm
Heartbeat
0.03 mm
Grease the bearing clearance:
- nominal
0.035 - 0.080 mm
- The maximum permissible
0.15 mm
Free wheeling
0.077 - 0.197 mm
The diameter of the pusher
29.48 - 29.50 mm
The gap between the plunger and the wall of its housing:
- nominal
0.025 - 0.065 mm
- The maximum permissible
0.178 mm
Valve clearance (models 1998)
0.225 - 0.290 mm
The crankshaft and connecting rods
Bearing rod:
- diameter
47.185 - 47.200 mm
- Maximum taper
0.005 mm
- Maximum roundness
0.003 mm
- The lubricating gap (nominal)
0.013 - 0.38 mm
Backlash (free lift) of a rod:
- nominal
0.108 - 0.258 mm
- The maximum permissible
0.30 mm
Main bearing:
- diameter
50.55 - 50.73 mm
- Maximum taper
0.005 mm
- Maximum roundness
0.003 mm
- Maximum wear
0.03 mm
Lubricating gap (nominal):
- Bearing N3 (central)
0.030 - 0.055 mm
- Other bearings
0.023 - 0.050 mm
- The maximum permissible
0.065 mm
Free wheeling of the crankshaft:
- nominal
0.078 - 0.278 mm
- The maximum permissible
0.295 mm
Cylinder block
Maximum permissible deformation of the surface of the cylinder
0.05 mm
Bore:
- nominal
81.69 - 81.71 mm
- The maximum allowable taper and roundness of the cylinder
0.01 mm
Pistons, piston rings
Bore
81.64 - 81.66 mm
The clearance between the piston and the cylinder:
- nominal
0.038 - 0.050 mm
- maximum
0.15 mm
Limit the piston ring gap:
- Compression Ring:
??? nominal
0.15 - 0.30 mm
??? maximum
0.50 mm
- Scraper ring:
??? nominal
0.2 - 0.7 mm
??? maximum
0.875 mm
The gap between the piston ring groove and the periphery of the ring (compression ring only):
- nominal
0.035 - 0.065 mm
- maximum
0.083 mm

Torques Nm

Bolts main bearing caps:
- Stage 1
18 - 22
- Stage 2
Tighten for 90 ?�
Nuts of covers of rods:
- Stage 1
22 - 26
- Stage 2
Tighten for 90 ?�
Bolts amplifying section of the cylinder
19 - 24




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