Engine Block: Diagnosis Acura RL II facelift

Crankshaft Inspection

Out-of-Round and Taper

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1. Remove the crankshaft from the engine block (see «CRANKSHAFT AND PISTON REMOVAL»(ref-348540-S13386063442009112400000) ).
2. Clean the crankshaft oil passages with pipe cleaners or a suitable brush.
3. Check the keyway slot and the threaded holes for damage.
4. Measure out-of-round at the middle of each rod and 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 (0.0002 in.) max. Service Limit: 0.010 mm (0.0004 in.)
5. 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 (0.0002 in.) max. Service Limit: 0.010 mm (0.0004 in.) Straightness
6. Place the engine block on the surface plate.
7. Clean and install the bearings on the No. 1 and No. 4 journal of the engine block.
8. Lower the crankshaft into the engine block.
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 (0.0010 in.) max. Service Limit: 0.030 mm (0.0012 in.)

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1. Remove the piston from the engine block (see «CRANKSHAFT AND PISTON REMOVAL»(ref-348540-S13386063442009112400000) ).
2. Check the piston for distortion or cracks.
3. Measure the piston diameter at a point 16.0 mm (0.63 in.) from the bottom of the skirt. Piston Diameter Standard (New): 89.983-89.996 mm (3.5426-3.5431 in.) Service Limit: 89.975 mm (3.5423 in.)
4. Measure wear and taper in direction X and Y at three levels in each cylinder as shown. Cylinder Bore Size Standard (New): 90.000-90.015 mm (3.5433-3.5439 in.) Service Limit: 90.065 mm (3.5459 in.) Bore Taper Limit: (Difference between first and third measurement) 0.015 mm (0.00059 in.)
5. 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 (0.003 in.) max.
6. Calculate the difference between cylinder bore diameter and piston diameter. If the clearance is near or exceeds the service limit, inspect the piston and cylinder bore for excessive wear. Piston-to-Cylinder Bore Clearance Standard (New): 0.004-0.032 mm (0.0002-0.0013 in.) Service Limit: 0.070 mm (0.0027 in.)

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1. Remove the piston from the engine block (see «CRANKSHAFT AND PISTON REMOVAL»(ref-348540-S13386063442009112400000) ).
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 the 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. Heat the piston and connecting rod assembly to about 158°F (70°C), then remove the piston pin.

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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): 21.961-21.965 mm (0.8646-0.8648 in.) Service Limit: 21.954 mm (0.8643 in.)
2. Zero the dial indicator to the piston pin diameter.
3. Check the difference between the piston pin diameter and piston pin hole diameter on the piston. Piston Pin-to-Piston Clearance Standard (New): -0.005 to +0.002 mm (-0.0002 to +0.00008 in.) Service Limit: 0.004 mm (0.0002 in.)
4. Measure the piston pin-to-connecting rod clearance. Piston Pin-to-Connecting Rod Clearance Standard (New): 0.005-0.015 mm (0.0002-0.0006 in.) Service Limit: 0.019 mm (0.0007 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 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.

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1. Remove the piston from the engine block (see «CRANKSHAFT AND PISTON REMOVAL»(ref-348540-S13386063442009112400000) ).
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 that fits the piston grooves. File down the blade, if necessary. The top ring and second ring grooves are 1.2 mm (0.05 in.) wide, and the oil ring groove is 2.8 mm (0.11 in.) 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 (0.6-0.8 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 ). Piston Ring End-Gap Top Ring: Standard (New): 0.30-0.40 mm (0.012-0.016 in.) Service Limit: 0.60 mm (0.024 in.) Second Ring: Standard (New): 0.40-0.55 mm (0.016-0.022 in.) Service Limit: 0.70 mm (0.028 in.) Oil Ring: Standard (New): 0.20-0.70 mm (0.008-0.028 in.) Service Limit: 0.80 mm (0.031 in.)
6. Install the rings as shown. The top ring (A) has a 1E mark and the second ring (B) has a 2E mark. The manufacturing marks (C) must face upward.
7. After installing a new set of rings, measure the ring-to-groove clearance: Top Ring Clearance Standard (New): 0.055-0.085 mm (0.0022-0.0033 in.) Service Limit: 0.15 mm (0.006 in.) Second Ring Clearance Standard (New): 0.030-0.060 mm (0.0012-0.0024 in.) Service Limit: 0.13 mm (0.005 in.)
8. Rotate the rings in their grooves to make sure they do not bind.
9. Position the ring end gaps as shown