Engine Block: Other Acura MDX II facelift

Connecting Rod Bearing Selection

Each connecting rod falls into one of four tolerance ranges (from 0 to 0.024 mm (0.0009 in), in 0.006 mm (0.0002 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 III) 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: 60.0 mm (2.362 in)

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 the crank (codes for rod journal size) to choose the correct bearings. If the codes are indecipherable because of an accumulation of dirt and dust, do not scrub them with a wire brush or scraper. Clean them only with solvent or detergent.

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1. If the engine is already out of the vehicle, go to step 6 .
2. Raise the vehicle on the lift.
3. Drain the engine oil (see «OIL PRESSURE TEST»(ref-510433-S33261716192012102300000) ).
4. Remove the splash shield (see «SPLASH SHIELD REPLACEMENT»(ref-510458-S02765418422012102300000) ) and the front undercover (see «FRONT UNDERCOVER REPLACEMENT»(ref-510458-S39595599002012102300000) ).
5. Remove exhaust pipe A (see step 31 under «ENGINE REMOVAL»(ref-510463-S16822501512012102300000) ).
6. Remove the rear warm up TWC bracket.
7. Remove the CKP sensor cover (A) and the bolt (B), then disconnect the CKP sensor connector (C).
8. Remove the torque converter cover (A) and the four bolts (B) securing the transmission.
9. Remove the bolts securing the oil pan.
10. Using a flat blade screwdriver, separate the oil pan from the block in the places shown.
11. Remove the oil pan.

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1. Remove the engine/transmission (see «ENGINE REMOVAL»(ref-510463-S16822501512012102300000) ).
2. Remove the transmission (see «TRANSMISSION REMOVAL»(ref-510439-S00620548382012102300000) ).
3. Remove the drive plate (see «DRIVE PLATE REMOVAL AND INSTALLATION»(ref-510439-S30326495902012102300000) ).
4. Remove the cylinder heads (see «CYLINDER HEAD REMOVAL»(ref-510448-S02379091542012102300000) ).
5. Remove the timing belt drive pulley from the crankshaft.
6. Remove the oil pan (see «OIL PAN REMOVAL»(ref-510471-S29642849632012102300000) ).
7. Remove the engine block end cover.
8. Remove the rocker arm oil control solenoid/oil filter assembly.
9. Remove the oil strainer (A), the baffle plate (B), and the oil pump (C).
10. Remove the connecting rod caps after setting the connecting rod journal at bottom dead center (BDC) for each cylinder. Remove the piston/connecting rod assembly by pushing on the connecting rod. Take care not to damage the oil jets, connecting rod journal, or the cylinder with the connecting rod.
11. Remove the bearing from the rod cap. Keep all caps/bearings in order.
12. Remove the upper bearing halves from the connecting rods, and set them aside with their respective caps.
13. After removing a piston/connecting rod assembly, reinstall the connecting rod cap on the rod.
14. To avoid confusion during reassembly, mark each piston/connecting rod assembly with its cylinder number.
15. Loosen the bearing cap bolts and the bearing cap side bolts in sequence 1/3 turn at a time; repeat the sequence until all bolts are loosened.
16. Remove the bearing cap bolts (A) and the bearing cap side bolts (B), then remove the main bearing cap (C).
17. Lift the crankshaft (A) out of the engine block, being careful not to damage the journals and the CKP pulse plate (B).
18. Remove the CKP pulse plate from the crankshaft (see «CKP PULSE PLATE REPLACEMENT»(ref-510471-S34554901812012102300000) ).
19. Reinstall the main bearing caps and the bearings on the engine block in the proper order.

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1. Remove the crankshaft from the engine block (see «CRANKSHAFT AND PISTON REMOVAL»(ref-510471-S21413533192012102300000) ).
2. Remove the CKP pulse plate from the crankshaft (see «CKP PULSE PLATE REPLACEMENT»(ref-510471-S34554901812012102300000) ).
3. Clean the crankshaft oil passages with pipe cleaners or a suitable brush.
4. Check the keyway slot and the threaded holes for damage.
5. Measure the out-of-round at the middle of each rod and the main journal in two places. The difference between measurements on each journal must not be more than the service limit. Journal Out-of-Round Standard (New): 0.005 mm (0.00020 in) max. Service Limit: 0.010 mm (0.00039 in)
6. Measure the taper at the edges of each rod and main journal. The difference between measurements on each journal must not be more than the service limit. Journal Taper Standard (New): 0.005 mm (0.00020 in) max. Service Limit: 0.010 mm (0.00039 in) Straightness
7. Place the V-blocks on a flat surface.
8. Check the total runout with the crankshaft supported on V-blocks.
9. Measure the runout on all of the main journals. Rotate the crankshaft two complete revolutions. The difference between measurements on each journal must not be more than the service limit. Crankshaft Total Runout Standard (New): 0.025 mm (0.00098 in) max. Service Limit: 0.030 mm (0.00118 in)

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1. Remove the pistons from the engine block (see «CRANKSHAFT AND PISTON REMOVAL»(ref-510471-S21413533192012102300000) ).
2. Check the pistons for distortion or cracks.
3. Measure the piston skirt diameter at a point 16 mm (0.63 in) from the bottom of the skirt. Piston Diameter Standard (New): 89.983-89.996 mm (3.54263-3.54314 in) Service Limit: 89.975 mm (3.54232 in)
4. Measure the wear and taper in direction X and Y at three levels in each cylinder as shown.
5. If the measurements in any cylinder are beyond the service limit or the cylinders are damaged, replace the engine block. Cylinder Bore Size Standard (New): 90.000-90.015 mm (3.54330-3.54389 in) Service Limit: 90.065 mm (3.54586 in) Bore Taper Limit: (Difference between first and third measurement) 0.05 mm (0.0020 in)
6. Check the top of the engine block for warpage. Measure along the edges and across the center as shown. Engine Block Warpage Standard (New): 0.07 mm (0.002 in) max. Service Limit: 0.10 mm (0.003 in)
7. Calculate the difference between cylinder bore diameter and the piston diameter. If the clearance is near or exceeds the service limit, inspect the piston and the cylinder bore for excessive wear. Piston-to-Cylinder Bore Clearance Standard (New): 0.004-0.032 mm (0.00016-0.00126 in) Service Limit: 0.08 mm (0.0031 in)

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1. Remove the pistons from the engine block (see «CRANKSHAFT AND PISTON REMOVAL»(ref-510471-S21413533192012102300000) ).
2. Apply new engine oil to the piston pin snap rings (A) and turn them in the ring grooves until the end gaps are lined up with the cutouts in the piston pin bores (B). NOTE: Take care not to damage the ring grooves.
3. Remove snap rings (A) from both sides of each piston. Start at the cutout in the piston pin bore. Remove the snap rings carefully so they do not go flying or get lost. Wear eye protection.
4. Separately heat each piston and connecting rod assembly to about 158°F (70°C), then remove the piston pin.