Bearing Inspection (4.0L Engine); Timing Chain Inspection (4.0L); Pulley Inspection (4.0L); Timinc Chain Cover Inspection (4.0L) - Mazda B-Series 1997 Workshop Manual

INSPECTION I REPAIR
1 5. Measure each journal diameter in X and Y directions at
two points
U J
Main journal
Diameter: 56.9798-57.0026mm
(2.2433-2.2442 in)
Out-of-round: 0.0152mm f0.0006 in1
Crankpin journal
Diameter: 53.9800-54.0004mm
9
(2.1 252-2.1 260 in)
MBlO91-A 4BUOB3-120
Out-of-round: 0.0152mm (0.0006 in)
6. If thediameter is less than the minimum, grind the journals
to match undersize bearings.
CRATERS
oh
POCKETS
BRIGHTFOLISHED)
SECTIONS
FATIGUE FAILURE IMPROPER SEATING
SCRATCHES DIRT
IMBEDDED OUT
INTO BEARING
MATERIAL
SCRATCHED BY DIRT LACK OF OIL OR
IMPROPER CLEARANCE
FROM EDGES RADIUS RIDE
HOURGLASSING
RADIUS RlDE
Undersize bearing: 0.0254mm (0.001 in)
BEARING
Main Bearing and Connecting Rod Bearing
Check the main bearing and connecting rod bearings for
peeling, scoring and other damage.
TIMING CHAIN
Check the timing chain for damage, wear or excessive
looseness. Replace it if necessary.
4BUOB3-122
PULLEY
Timing Chain Pulley and Camshaft Pulley
Inspect the teeth of each pulley for wear, deformation and
other damage. Replace as necessary.
4BUOB3-123
Timing chain cover
Inspect the timing chain cover for damage and cracks.
Replace it if necessary.
4BUOB3-124
FLYWHEEL
Refer to Section B1.