Engine Block: Other Acura TL IV 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 is 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

J35Z6 engine: 58.0 mm (2.283 in)

J37A4 engine: 60.0 mm (2.362 in)

Inspect the connecting rod for cracks and heat damage.

J35Z6 engine

Note. The J37A4 engine can not be honed. If the cylinders are damaged, the engine block must be replaced.

Scheme 568

1. Measure the cylinder bores (see step 4 ). If the engine block is to be reused, hone the cylinders and remeasure the bores. Only scored or scratched cylinder bores must be honed.
2. Remove the oil jets (see «OIL JET REPLACEMENT»(ref-512333-S15606846022012103100000) ).
3. Hone the cylinder bores with honing oil and a fine (400 grit) stone in a 60 degree Crosshatch pattern. NOTE: Use only a rigid hone with 400 grit or finer stone, such as Sunnen, Ammco, or equivalent. Do not use stones that are worn or broken.
4. When honing is complete, thoroughly clean the engine block of all metal particles. Wash the cylinder bores with hot soapy water, then dry and oil them immediately to prevent rusting. NOTE: Never use solvent, it will only redistribute the grit on the cylinder walls.
5. If scoring or scratches are still present in the cylinder bores after honing to the service limit, rebore the engine block. Some light vertical scoring and scratching is acceptable if it is not deep enough to catch your fingernail and does not run the full length of the bore.
6. Install the oil jets (see «OIL JET REPLACEMENT»(ref-512333-S15606846022012103100000) ).

Scheme 569

Scheme 570

1. Remove the pistons from the «engine block»(ref-512373-S27669588632012103100000) .
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 the 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 CF (70 °C), then remove the piston pin.

Scheme 571