Engine Block: Diagnosis Acura TL IV facelift

Crankshaft Inspection

Out-of-Round and Taper

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1. Remove the «crankshaft from the engine block»(ref-512373-S27669588632012103100000) .
2. Remove the «CKP pulse plate from the crankshaft»(ref-512373-S07373670582012103100000) .
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»(ref-512373-S27669588632012103100000) .
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. J35Z6 engine Piston Skirt Diameter Standard (New): 88.975- 88.985 mm (3.50295- 3.50334 in) Service Limit: 88.965 mm (3.50255 in) Oversize Piston Skirt Diameter 0.25: 89.225- 89.235 mm (3.51279- 3.51318 in) J37A4 engine Piston Skirt 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 in illustration above.
5. J35Z6 engine: If the measurements in any cylinder are beyond the oversize bore service limit, replace the engine block. If the engine block has to be rebored, refer to step 8 after reboring. J37A4 engine: If the measurements in any cylinder are beyond the service limit, replace the engine block. The J37A4 engine block can not be rebored. J35Z6 engine Cylinder Bore Size Standard (New): 89.000- 89.015 mm (3.50393- 3.50452 in) Service Limit: 89.065 mm (3.50649 in) Oversize 0.25: 89.250- 89.265 mm (3.51377- 3.51436 in) Reboring Limit: 0.25 mm (0.0098 in) Bore Taper Limit: (Difference between first and third measurement) 0.05 mm (0.0020 in) J37A4 engine 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. «J35Z6 engine»(ref-512373-S18437549092012103100000) : Hone any scored or scratched cylinder bores. NOTE: The J37A4 engine can not be honed. If the cylinders are damaged, the engine block must be replaced.
7. Check the top of the engine block for warpage. Measure along the edges and across the center as shown in illustration below. Engine Block Warpage Standard (New): 0.07 mm (0.002 in) max. Service Limit: 0.10 mm (0.003 in)
8. Calculate the difference between the 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.

J35Z6 engine

Piston-to-Cylinder Bore Clearance

Standard (New): 0.015- 0.040 mm (0.001- 0.001 in)

Service Limit: 0.08 mm (0.003 in)

J37A4 engine

Piston-to-Cylinder Bore Clearance

Standard (New): 0.004- 0.032 mm (0.001- 0.001 in)

Service Limit: 0.07 mm (0.002 in)

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Inspection

Note. Inspect the piston, the piston pin, and the connecting rod when they are at room temperature.

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1. Measure the diameter of the piston pin. Piston Pin Diameter Standard (New): 21.962- 21.965 mm (0.86464- 0.86476 in) Service Limit: 21.954 mm (0.86433 in)
2. Zero the dial gauge (A) to the piston pin diameter.
3. Check the difference between the piston pin diameter and the piston pin hole diameter on the piston. J35Z6 engine Piston Pin-to-Piston Clearance Standard (New): -0.005- 0.001 mm (-0.00020- 0.00004 in) Service Limit: 0.004 mm (0.00016 in) J37A4 engine Piston Pin-to-Piston Clearance Standard (New): -0.005- 0.003 mm (-0.00020- 0.00012 in) Service Limit: 0.004 mm (0.00016 in)
4. Measure the piston pin-to-connecting rod clearance. Piston Pin-to-Connecting Rod Clearance Standard (New): 0.005- 0.014 mm (0.00020- 0.00055 in) Service Limit: 0.019 mm (0.00075 in)

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1. Install a piston pin snap ring (A) only on one side.
2. Coat the piston pin bore in the piston, the bore in the connecting rod, and the piston pin with new engine oil.
3. Heat the piston to about 158 °F (70 °C).
4. Assemble the piston (A) and the connecting rod (B) with the embossed marks (C) on the same side. Install the piston pin (D). NOTE: Apply new engine oil to the piston pin.
5. Install the remaining snap ring.
6. Reassemble the other pistons the same way.

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1. Remove the pistons from the «engine block»(ref-512373-S27669588632012103100000) .
2. Using a ring expander (A), remove the old piston rings (B).
3. Clean all the ring grooves thoroughly with a squared-off broken ring, or a ring groove cleaner with a blade to fit the piston grooves. File down the blade, if necessary. The top ring and second ring grooves are 1.2 mm (0.047 in) wide, and the oil ring groove is 2.8 mm (0.110 in) (J35Z6 engine) or 2.0 mm (0.079 in) (J37A4 engine) wide. Do not use a wire brush to clean the ring grooves, or cut the ring grooves deeper with the cleaning tool. NOTE: If the piston is to be separated from the connecting rod, do not install new rings yet.
4. Using a piston, push a new ring (A) into the cylinder bore 15- 20 mm (0.59- 0.79 in) from the bottom.
5. Measure the piston ring end-gap (B) with a feeler gauge: If the gap is too small, check to see if you have the proper rings for your engine. If the gap is too large, recheck the cylinder bore diameter against the wear limits (see step 4 ).
6. J35Z6 engine: If the bore is over the service limit, the engine block must be rebored. J35Z6 engine Piston Ring End-Gap Top Ring: Standard (New): 0.20- 0.35 mm (0.008- 0.013 in) Service Limit: 0.60 mm (0.023 in) Second Ring: Standard (New): 0.40- 0.S5 mm (0.016- 0.021 in) Service Limit: 0.70 mm (0.027 in) Oil Ring: Standard (New): 0.20- 0.70 mm (0.008- 0.027 in) Service Limit: 0.80 mm (0.031 in) J37A4 engine Piston Ring End-Gap Top Ring: Standard (New): 0.30- 0.40 mm (0.012- 0.015 in) Service Limit: 0.60 mm (0.023 in) Second Ring: Standard (New): 0.40- 0.55 mm (0.016- 0.021 in) Service Limit: 0.70 mm (0.027 in) Oil Ring: Standard (New): 0.20- 0.35 mm (0.008- 0.013 in) Service Limit: 0.45 mm (0.017 in)
7. Install the rings as shown in illustration below. The top ring (A) has a 1D or 1R mark (J35Z6 engine) or 1E mark (J37A4 engine) and the second ring (B) has a 2X or 2R mark (J35Z6 engine) or 2E mark (J37A4 engine). The manufacturing marks (C) must be facing upward. Piston Ring Dimensions
8. After installing a new set of rings, measure the ring-to-groove clearance: J35Z6 engine Top Ring Clearance Standard (New): 0.055- 0.080 mm (0.003- 0.003 in) Service Limit: 0.15 mm (0.005 in) Second Ring Clearance Standard (New): 0.030- 0.055 mm (0.002- 0.002 in) Service Limit: 0.13 mm (0.005 in) J37A4 engine Top Ring Clearance Standard (New): 0.055- 0.085 mm (0.003- 0.003 in) Service Limit: 0.15 mm (0.005 in) Second Ring Clearance Standard (New): 0.030- 0.060 mm (0.002- 0.002 in) Service Limit: 0.13 mm (0.005 in)
9. Rotate the rings in their grooves to make sure they do not bind.
10. Position the ring end gaps as shown in illustration below.

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