Connecting Rod Cap - Mazda B-Series 1997 Workshop Manual

ASSEMBLY
Connecting rod cap
1. Measure the connecting rod bearing oil clearances as
follows:
Caution
Do not rotate the crankshaft when measuring the
oil clearances.
Oil clearances must be measured with the connect-
ing rod in the BTDC position.
(1) Remove any foreign material and oil from the journals
and bearings.
(2) Install the connecting rod bearing into the connecting
rod cap.
(3) Position Plastigage atop the journals in the axial
direction.
(4) Apply clean engine oil to the threads and seat faces of
the connecting rod cap bolts.
(5) Install the connecting rod cap.
(6) Tighten the connecting rod cap nuts in two sequences.
Tightening torque:
Step 1 : 3 4 4 1 N-m ( 3 . 5 4 . 1 kgf-m, 25-30 ftslbf)
Step 2: 4 1 4 9 N.m (4.1-4.9 kgf.m, 30-36 ftelbf)
(7) Remove the connecting rod cap.
(8) Measure the Plastigage at each journal at the widest
point for the smaller clearance, and the narrowest
point for the largest clearance.
Oil clearance
Number One Main Bearing:
Standard: 0.01 0-0.054mm (0.0004--0.0021 in)
Maximum: 0.054 (0.0021 in)
Number Two to Five Main Bearings:
Standard: 0.020-0.064mm (0.0008-0.0025 in)
Maximum: 0.064 (0.0025 in)
(9) If the oil clearance exceeds the maximum, grind the
crankshaft and install undersize bearings.
2. Install the connecting rod bearings and caps as follows:
(1) Remove the Plastigage from the journals and bear-
ings.
(2) Apply a liberal amount of clean engine oil to the
connecting rod bearings.
(3) lnstall the bearing in the connecting rod and cap, with
the tangs fitting the slots provided.
(4) Turn the crankshaft throw to the bottom of its stroke.
Push the piston all the way down until the connecting
rod bearing seats on the crankshaft journal.
(5) Install the connecting rod cap. The connecting rod cap
nuts must be tightened in two steps.
Tightening torque:
Step 1 : 3 4 4 1 N-m (3.5-4.1 kgf.m, 25-30 ft.lbf)
Step 2: 4 1 4 9 N-m ( 4 . 1 4 . 9 kgf-m, 30-36 ft.lbf)