ZDX V6-3.7L (2010)
Connecting Rod Bearing: Service and Repair
Connecting Rod Bearing Replacement
Connecting Rod Bearing Clearance Inspection
1. Remove the connecting rod cap and the bearing half See: Crankshaft/Service and Repair/Crankshaft and Piston Removal.
2. Clean the connecting rod journal and the bearing half with a clean shop towel.
3. Place a strip of plastigage across the rod journal.
4. Reinstall the bearing half and the rod cap, and torque the connecting rod bolt to 20 Nm (2.0 kg-m, 15 lb-ft) + 90 °.
NOTE:
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Apply new engine oil to the bolt threads and flanges.
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Do not rotate the crankshaft during inspection.
5. Remove the rod cap and the bearing half and measure the widest part of the plastigage.
Connecting Rod Bearing-to-Journal Oil Clearance
6. If the plastigage measures too wide or too narrow, remove the upper half of the bearing. Install a new, complete bearing with the same color code,
and recheck the clearance. Do not file, shim, or scrape the bearings or the caps to adjust clearance.
7. If the plastigage shows the clearance is still incorrect, try the next larger or smaller bearing (the color listed above or below that one), and check
clearance again. If the proper clearance cannot be obtained by using the appropriate larger or smaller bearings, replace the crankshaft and start
over See: Crankshaft/Service and Repair/Crankshaft and Piston Removal.
Connecting Rod Bearing Selection
Each connecting rod falls into one of four tolerance ranges (from 0 to 0.024 mm (0.00095 in), in 0.006 mm (0.00024 in) increments) depending on the
size of its big end bore.
It's then stamped with a number or bar (1, 2, 3, or 4/I, II, III, or IIII) indicating the range. You may find any combination of 1, 2, 3, or 4/I, II, III, or IIII
in any engine.
Big End Bore Size
Inspect the connecting rod for cracks and heat damage.
Big End Bore Code Locations
Numbers or bars have been stamped on the side of each connecting rod as a code for the size of the big end. Use them, and the letters or bars stamped on
