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Home >> Acura >> 2017 >> ILX >> Repair and Diagnosis >> Engine Performance >> Specifications >> Engine Control System / Engine Mechanical Service Specifications (Except Hybrid) >> Engine Assembly (KA, Kc Models) (2019 2020 2021 2022) >> Engine Block
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Engine Block

Item  Measurement  Qualification  Standard or New  Service Limit 
Block Warpage of deck   0.07 mm (0.002 in) max. -
Bore diameter A or I 87.010-87.020 mm (3.42558-3.42598 in) 87.070 mm (3.42795 in)
B or II 87.000-87.010 mm (3.42519-3.42558 in) 87.070 mm (3.42795 in)
Bore taper   - 0.05 mm (0.0020 in)
Reboring limit   - 0.25 mm (0.0098 in) max.
Piston Skirt O.D. at 10 mm (0.39 in) from bottom of skirt Letter A 86.980-86.990 mm (3.42440-3.42480 in) 86.930 mm (3.42243 in)
Letter B 86.970-86.980 mm (3.42401-3.42440 in) 86.920 mm (3.42204 in)
Clearance in cylinder   0.020-0.040 mm (0.00079-0.00157 in) 0.05 mm (0.0020 in)
Item  Measurement  Qualification  Standard or New  Service Limit 
Piston ring Ring-to-groove clearance Top 0.060-0.085 mm (0.003 in) 0.13 mm (0.005 in)
Second 0.035-0.060 mm (0.002 in) 0.13 mm (0.005 in)
Ring end gap (except RIKEN) Top 0.20-0.25 mm (0.008-0.009 in) 0.50 mm (0.019 in)
Second 0.30-0.40 mm (0.012-0.015 in) 0.45 mm (0.017 in)
Oil 0.10-0.35 mm (0.004-0.013 in) 0.60 mm (0.023 in)
Ring end gap (RIKEN) Top 0.20-0.28 mm (0.008-0.011 in) 0.50 mm (0.019 in)
Second 0.29-0.41 mm (0.011-0.016 in) 0.45 mm (0.017 in)
Oil 0.10-0.40 mm (0.004-0.015 in) 0.60 mm (0.023 in)
Piston pin O.D.   21.962-21.965 mm (0.86464-0.86476 in) 21.953 mm (0.86429 in)
Pin-to-piston clearance   -0.005-0.001 mm (-0.00020-0.00004 in) 0.005 mm (0.00020 in)
Connecting rod Pin-to-rod clearance   0.005-0.014 mm (0.00020-0.00055 in) 0.02 mm (0.0008 in)
Big end bore diameter   51.0 mm (2.008 in) -
End play   0.15-0.35 mm (0.006-0.013 in) 0.40 mm (0.015 in)
Crankshaft Rod journal diameter   47.976-48.000 mm (1.88882-1.88976 in) -
Rod/main journal taper   0.005 mm (0.00020 in) max. 0.010 mm (0.00039 in)
Rod/main journal out-of-round   0.004 mm (0.00016 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   0.03 mm (0.0012 in) max. -
Crankshaft bearing Main bearing-to-journal oil clearance No. 1, 2, 4, 5 journals 0.017-0.041 mm (0.00067-0.00161 in) 0.050 mm (0.00197 in)
No. 3 journal 0.025-0.049 mm (0.00098-0.00193 in) 0.055 mm (0.00217 in)
Connecting rod bearing-to-journal oil clearance   0.032-0.066 mm (0.00126-0.00260 in) -
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