Engine Block (V6): Diagnosis Honda Accord VIII

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-423717-S13957363652011092800000) ).
2. Remove the CKP pulse plate from the crankshaft (see «CKP PULSE PLATE REPLACEMENT»(ref-423717-S12388147262011092800000) ).
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 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 (see «CRANKSHAFT AND PISTON REMOVAL»(ref-423717-S13957363652011092800000) ).
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. 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)
4. Measure the wear and taper in direction X and Y at three levels in each cylinder as shown in illustration. If 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 7 after reboring. 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)
5. Hone any scored or scratched cylinder bores (see «CYLINDER BORE HONING»(ref-423717-S04615971122011092800000) ).
6. Check the top of the engine block for warpage. Measure along the edges and across the center as shown in illustration. Engine Block Warpage Standard (New): 0.07 mm (0.002 in) max.
7. Calculate the difference between 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. Piston-to-Cylinder Bore Clearance Standard (New): 0.015-0.040 mm (0.00059-0.00157 in) Service Limit: 0.08 mm (0.0031 in)

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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-423676-S38978290242011092800000) ).
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-423676-S38978290242011092800000) ).

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1. Remove the pistons from the engine block (see «CRANKSHAFT AND PISTON REMOVAL»(ref-423717-S13957363652011092800000) ).
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°F (70°C), then remove the piston pin.

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 indicator to the piston pin diameter.
3. Check the difference between the piston pin diameter and the piston pin hole diameter on the piston. Piston Pin-to-Piston Clearance Standard (New): -0.0050-0.0010 mm (-0.000197-0.000039 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 (see «CRANKSHAFT AND PISTON REMOVAL»(ref-423717-S13957363652011092800000) ).
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) 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 ). If the bore is over the service limit, the engine block must be rebored. 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): 0.40-0.55 mm (0.0157-0.0217 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 (0.031in)
6. Install the rings as shown in illustration. The top ring (A) has a 1D mark and the second ring (B) has a 2X mark. The manufacturing marks (C) must be facing upward.
7. After installing a new set of rings, measure the ring-to-groove clearance: 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)
8. Rotate the rings in their grooves to make sure they do not bind.
9. Position the ring end gaps as shown in illustration. About 90°