Upper Main Bearing, Lower Main Bearing And Main Bearing Cap - Assembly Note; Oil Clearance Inspection (3.0L) - Mazda B-Series 1997 Workshop Manual

ASSEMBLY
1. Main bearings, upper
Assembly Note ................................ below
2. Crankshaft
3. Main bearings, lower
Assembly Note ................................ below
4. Main bearing caps
................................ Assembly Note below
5. Piston
...................... Assembly Note page B2-50
6. Piston pin
Assembly Note ...................... page B2-50
7. Connecting rod
...................... Assembly Note page 62-50
8. Piston ring
Assembly Note ...................... page 82-50
9. Connecting rod bearing
Assembly Note ...................... page 62-50
1 0. Connecting rod cap
Assembly Note ...................... page 62-51
11. Crankshaft rear main oil seal
Assembly Note ...................... page 62-53
1 2. Camshaft bearings
Assembly Note ...................... page B2-53
13. Camshaft
Assembly Note ...................... page 62-54
14. Camshaft thrust plate
Assembly Note ...................... page B2-54
Assembly Note
Upper main bearing, lower main bearing and main
bearing cap
1.
Measure the main bearing oil clearances as described
below:
Oil clearance inspection
(1) Remove any foreign material and oil from the jour
nals and bearings.
(2) Install the upper main bearings.
(3) Install the lower main bearings into the main bearing
caps.
(4) Install the crankshaft into the cylinder block.
(5) Position Plastigage atop the journals in the axial
direction.
(6) Apply clean engine oil to the threads and seat faces
of the main bearing cap bolts.
(7)
Install the main bearing cap.
(8) Tighten the main bearing cap bolts.
Tightening torque:
7 5 - 4 5 N-m (7.5-4.5 kgf-m, 5 5 - 4 3 ft.lbf)
(9) Remove the main bearing cap.
(1 0) Measure the Plastigage at each journal at the widest
point for the smallest clearance, and at the narrowest
point for the largest clearance.
Oil clearance
Standard: 0.025--0.035mm (0.001--0.0014 in)
Allowable: 0.020-0.066mm (0.0008-0.0025 in)
(1 1) If the oil clearance exceeds the maximum, grind the
crankshaft and install undersize bearings.