Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Block (J37A4)
2012 Acura TL BaseSECTION Engine Block (J37A4)
ENGINE BLOCK (J37A4) SPECIFICATIONS
| Item | Measurement | Qualification | Standard or New | Service Limit |
|---|---|---|---|---|
| Block | Warpage of deck | 0.07 mm (0.002 in) max. | 0.10 mm (0.003 in) | |
| Bore diameter | 90.000- 90.015 mm (3.54330- 3.54389 in) | 90.065 mm (3.54586 in) | ||
| Bore taper | Difference between first and third measurement | - | 0.05 mm (0.0020 in) | |
| Piston | Skirt O.D. at 16 mm (0.63 in) from bottom of skirt | 89.983- 89.996 mm (3.54263- 3.54314 in) | 89.975 mm (3.54232 in) | |
| Clearance in cylinder | 0.004- 0.032 mm (0.001- 0.001 in) | 0.07 mm (0.002 in) | ||
| Piston ring | Ring-to-groove clearance | Top | 0.055- 0.085 mm (0.003- 0.003 in) | 0.15 mm (0.005 in) |
| Second | 0.030- 0.060 mm (0.002- 0.002 in) | 0.13 mm (0.005 in) | ||
| Ring end gap | Top | 0.30- 0.40 mm (0.012- 0.015 in) | 0.60 mm (0.023 in) | |
| Second | 0.40- 0.55 mm (0.016- 0.021 in) | 0.70 mm (0.027 in) | ||
| Oil | 0.20- 0.35 mm (0.008- 0.013 in) | 0.45 mm (0.017 in) | ||
| Piston pin | O.D. | 21.962- 21.965 mm (0.86464- 0.86476 in) | 21.954 mm (0.86433 in) | |
| Pin-to-piston clearance | - 0.005- 0.003 mm (- 0.00020- 0.00012 in) | 0.004 mm (0.00016 in) | ||
| Connecting rod | Pin-to-rod clearance | 0.005- 0.014 mm (0.00020- 0.00055 in) | 0.019 mm (0.00075 in) | |
| Small end bore diameter | 21.970- 21.976 mm (0.86496- 0.86520 in) | - | ||
| Big end bore diameter | 60.0 mm (2.362 in) | - | ||
| End play | 0.15- 0.35 mm (0.006- 0.013 in) | 0.45 mm (0.017 in) | ||
| Crankshaft | Main journal diameter | 71.976- 72.000 mm (2.83370- 2.83464 in) | - | |
| Rod journal diameter | 56.976- 57.000 mm (2.24315- 2.24409 in) | - | ||
| Rod/main journal taper | 0.005 mm (0.00020 in) max. | 0.010 mm (0.00039 in) | ||
| Rod/main journal out-of-round | 0.005 mm (0.00020 in) max. | 0.010 mm (0.00039 in) | ||
| End play | 0.10- 0.35 mm (0.0039- 0.0138 in) | 0.45 mm (0.0177 in) | ||
| Total runout | 0.025 mm (0.00098 in) max. | 0.030 mm (0.00118 in) | ||
| Crankshaft bearing | Main bearing-to-journal oil clearance | 0.019- 0.045 mm (0.00075- 0.00177 in) | 0.050 mm (0.00197 in) | |
| Connecting rod bearing-to-journal oil clearance | 0.020- 0.044 mm (0.00079- 0.00173 in) | 0.050 mm (0.00197 in) |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.