Part 2
DISASSEMBLY
1. Remove the connecting rod cap.
2. Remove the connecting rod bearing.
NOTE: Keep the removed connecting rods, connecting rod caps and bearings in order so that they are kept in their original combinations/groups, and not mixed together.
3. Remove the piston rings using piston ring expander.
4. Remove the oil ring by hand.
NOTE: Arrange the removed piston rings in proper order, to prevent confusion.
5. Remove the snap ring.
ASSEMBLY
Tightening torque:N-m (kgf-m, ft-lb)
T: 45 (4.6, 33.2)
1. Apply engine oil to the surface of the connecting rod bearings, and install the connecting rod bearings on connecting rods and connecting rod caps.
2. Position each connecting rod with the side with a side mark facing forward, and install it.
3. Attach the connecting rod cap, and tighten with connecting rod nut. Make sure the arrow on connecting rod cap faces the front during installation.
NOTE:
^ Each connecting rod has its own mating cap. Make sure that they are assembled correctly by checking their matching number.
^ When tightening the connecting rod nuts, apply oil on the threads.
Tightening torque: 45 N-m (4.6 kgf-m, 33.2 ft-lb)
4. Install the oil ring upper rail, expander and lower rail by hand.
5. Install the second ring and top ring using piston ring expander.
NOTE: Assemble so that the piston ring mark "R" faces the top side of the piston.
INSPECTION
CYLINDER BLOCK
1. Check for cracks or damage. Use liquid penetrant tester on the important sections to check for fissures. Check that there are no marks of gas leaking or water leaking on gasket installing surface.
2. Check the oil passages for clogging.
3. Inspect the cylinder block surface that mates with cylinder head for warping by using a straight edge, and correct by grinding if necessary.
Warping limit: 0.025 mm (0.00098 in)
Grinding limit: 0.1 mm (0. 004 in)
Standard height of cylinder block: 201.0 mm (7.91 in)
CYLINDER AND PISTON
1. The cylinder bore size is stamped on the front upper face of the cylinder block.
NOTE:
^ Measurement should be performed at a temperature of 20 degrees C (68 degrees F).
^ Standard sized pistons are classified into two grades, "A" and "B". These grades should be used as guide lines in selecting a standard piston.
Standard diameter.
A: 99.505 - 99.515 mm (3.9175 - 3.9179 in)
B: 99.495 - 99.505 mm (3.9171 - 3.9175 in)
2. Measure inner diameter of each cylinder. Measure the inner diameter of each cylinder in both the thrust and piston pin directions at the heights as shown in the figure, using a cylinder bore gauge.
NOTE: Measurement should be performed at a temperature of 20 degrees C (68 degrees F).
Taper:
Standard: 0.015 mm (0.0006 in)
Out-of-roundness:
Standard: 0.010 mm (0.0004 in)
3. When the piston is to be replaced due to general or cylinder wear, select a suitable sized piston by measuring the piston clearance.
4. Measure outer diameter of each piston. Measure the outer diameter of each piston at the height as shown in the figure. (Thrust direction)
NOTE: Measurement should be performed at a temperature of 20 degrees C (68 degrees F).
Piston grade point H: 38.2 mm (1) 504 in)
Piston outer diameter:
Standard
A: 99.505 - 99.515 mm (3.9175 - 3.9179 in)
B: 99.495 - 99.505 mm (3.9171 - 3.9175 in)
0.25 mm (0.0098 in) oversize: 99.745 - 99.765 mm (3.9270 - 3.9277 in)
0.50 mm (0. 0 197 in) oversize: 99.995 - 100.015 mm (3.9368 - 3.9376 in)
5. Calculate the clearance between cylinder and piston.
NOTE: Measurement should be performed at a temperature of 20 degrees C (68 degrees F).
Cylinder to piston clearance at 20 degrees C (68 degrees F):
Standard: -0.010 - 0.010 mm (-0.00039 - 0.00039 in)
6. Boring and honing
1. If any of the measured value of taper, out-of-roundness or cylinder-to-piston clearance is out of standard or if there is any damage on the cylinder wall, rebore it to replace with an oversize piston.
CAUTION: When any of the cylinders needs reboring, other cylinders must be bored at the same time, and replaced with oversize pistons.
2. If the cylinder inner diameter exceeds the limit after boring and honing, replace the cylinder block.
NOTE: Immediately after reboring, the cylinder diameter may differ from its real diameter due to temperature rise. Thus, when measuring the cylinder diameter, wait until it has cooled to room temperature.
Cylinder inner diameter boring limit (diameter): To 100.005 mm (3.9372 in)
PISTON AND PISTON PIN
1. Check the piston and piston pin for breaks, cracks or wear. Replace if faulty.
2. Check the piston ring groove for wear and damage. Replace if faulty.
3. Make sure that the piston pin can be inserted into the piston pin hole with a thumb at 20 degrees C (68 degrees F). Replace if faulty.
Clearance between piston hole and piston pin:
Standard 0.004 - 0.008 mm (0.0002 - 0.0003 in)
4. Check the snap ring installation groove (A) on the piston for burr. If necessary, remove burr from the groove so that the piston pin can lightly move.
5. Check the piston pin snap ring for distortion, cracks and wear.
PISTON RING
1. If the piston ring is broken, damaged or worn, or if its tension is insufficient, or when the piston is replaced, replace the piston ring with a new part of the same size as piston.
NOTE:
^ The top ring and second ring have the mark to determine the direction for installing. When installing the ring to piston, face these marks to the top side.
^ Oil ring consists of the upper rail, expander and lower rail. When installing the oil ring on piston, be careful of each rails direction.
2. Using the piston, insert the piston ring and oil ring into the cylinder so that they are perpendicular to the cylinder wall, and measure the piston ring gap with a thickness gauge.
3. Fit the piston ring straight into the piston ring groove, then measure the clearance between piston ring and piston ring groove with a thickness gauge.
NOTE: Before measuring the clearance, clean the piston ring groove and piston ring.
CRANKSHAFT AND CRANKSHAFT BEARING
1. Clean the crankshaft completely, and check it for cracks using liquid penetrant tester. If defective, replace the crankshaft.
2. Measure the bend of crankshaft. If it exceeds the limit, correct or replace it.
NOTE: If a suitable V-block is not available, using just the #1 and #5 crankshaft bearings on cylinder block, position the crankshaft on cylinder block. Then, measure the crankshaft bend using a dial gauge.
Crankshaft bend limit: 0.035 mm (0.0014 in)
3. Inspect the crank journal and crank pin for wear. If they are not within the specification, replace the bearing with a suitable (undersize) one, and replace or grind to correct the crankshaft as necessary. When grinding the crank journal or crank pin, finish them to the specified dimensions according to the undersize bearing to be used.
Crank pin:
Out-of-roundness 0.003 mm (0.0001 in)
Cylindricality 0.004 mm (0.0002 in)
Grinding limit (dia.) To 51.750 mm (2.0374 in)
Crank journal:
Out-of-roundness 0.005 mm (0.0002 in)
Cylindricality 0.006 mm (0.0002 in)
Grinding limit (dia.) To 59.758 mm (2.3527 in)
4. Use a thickness gauge to measure the thrust clearance of crankshaft at #5 crank journal bearing. If the thrust clearance is not within the standard, replace the bearing.
Crankshaft thrust clearance:
Standard 0.030 - 0.115 mm (0.0012 - 0.0045 in)
5. Inspect individual crankshaft bearings for signs of flaking, seizure, melting and wear.
6. Measure the oil clearance on each crankshaft bearing using plastigauge. If the measured value is out of standard, replace the defective bearing with an undersize one, and replace or grind to correct the crankshaft as necessary.
Crankshaft oil clearance:
Standard 0.010 - 0.030 mm (0.0004 - 0.0012 in)