Part 1
OVERHAULHINT:
^ Thoroughly clean all parts to be assembled.
^ Before installing the parts, apply new engine oil to all sliding and rotating surfaces.
^ Replace all gaskets, O-rings and oil seals with new parts.
1. REMOVE CYLINDER BLOCK WATER DRAIN COCK SUB-ASSY
2. REMOVE WATER SEAL PLATE
a. Remove the 2 nuts.
b. Pry out the seal plate.
3. INSPECT CONNECTING ROD THRUST CLEARANCE
a. Using a dial indicator, measure the thrust clearance while moving the connecting rod back and forth.
Standard thrust clearance: 0.160 - 0.290 mm (0.0063 - 0.0138 inch)
Maximum thrust clearance: 0.35 mm (0.0138 inch)
If the thrust clearance is greater than maximum, replace the connecting rod assembly(s). If necessary, replace the crankshaft.
Connecting rod thickness: 22.880 - 22.920 mm (0.9008 - 0.9024 inch)
4. INSPECT CONNECTING ROD OIL CLEARANCE
a. Check the matchmarks on the connecting rod and cap ensure correct reassembly.
b. Remove the 2 connecting rod cap bolts.
c. Using the removed connecting rod cap bolts, remove the connecting rod cap and lower bearing by wiggling the connecting rod cap right and left.
HINT: Keep the lower bearing inserted with the connecting rod cap.
d. Clean the crank pin and bearing.
e. Check the crank pin and bearing for pitting and scratches.
If the crank pin or bearing is damaged, replace the bearings. If necessary, replace the crankshaft.
f. Lay a strip of Plastigage across the crank pin.
g. Install the connecting rod cap with the 2 bolts (See step 30).
h. Remove the 2 bolts, connecting rod cap and lower bearing (See steps (b) and (c) above).
i. Measure the Plastigage at its widest point.
Standard oil clearance: 0.021 - 0.047 mm (0.0008 - 0.0019 inch)
Maximum oil clearance: 0.065 mm (0.0026 inch)
If the oil clearance is greater than maximum, replace the bearings. If necessary, replace the crankshaft.
HINT: If using a standard bearing, replace it with one having the same number. If the number of the bearing cannot be determined. select the correct bearing by adding together the numbers imprinted on the connecting rod cap and crankshaft, then selecting the bearing with the same number as the total. There are 6 sizes of standard bearings, marked 2, 3, 4, 5, 6 and 7.
EXAMPLE:
Connecting rod cap "3" + Crankshaft "1" =
Total number 4 (Use bearing "4")
Reference
Connecting rod big end inside diameter
Crankshaft crank pin diameter
Standard sized bearing center wall thickness
j. Completely remove the Plastigage
5. REMOVE PISTON AND CONNECTING ROD
a. Using a ridge reamer remove all the carbon from the top of the cylinder
b. Push the piston, connecting rod assembly and upper bearing through the top of the cylinder block.
HINT:
^ Keep the bearings, connecting rod and cap together.
^ Arrange the piston and connecting rod assemblies in correct order.
6. REMOVE W/ PIN PISTON SUB-ASSY
a. Check fit between the piston and piston pin.
1. Try to move the piston back and forth on the piston pin.
If any movement is felt, replace the piston and pin as a set.
b. Using a piston ring expander, remove the 2 compression rings.
c. Remove the 2 side rails and oil ring by hand.
HINT: Arrange the piston rings in correct order only.
d. Using a small screwdriver, pry out the 2 snap rings.
e. Gradually heat the piston to approximately 60°C (140°F).
f. Using a plastic-faced hammer and brass bar, lightly tap out the piston pin and pin and remove the connecting rod.
HINT:
^ The piston and pin are a matched set.
^ Arrange the pistons, pins, rings, connecting rods and bearings in correct order.
7. INSPECT CRANKSHAFT THRUST CLEARANCE
a. Using a dial indicator, measure the thrust clearance while prying the crankshaft back and forth with a screwdriver.
Standard thrust clearance: 0.020 - 0.220 mm (0.0008 - 0.0087 inch)
Maximum thrust clearance: 0.30 mm (0.0118 inch)
If the thrust clearance is greater than maximum, replace the thrust washers as a set.
Thrust washer thickness: 2.440 - 2.490 mm (0.0961 - 0.0980 inch)
8. INSPECT CRANKSHAFT OIL CLEARANCE
a. Remove the 10 crankshaft bearing cap bolts.
b. Uniformly loosen and remove the 20 crankshaft bearing cap bolts in several passes, in the sequence shown.
c. Using 2 screwdrivers, pry out the crankshaft bearing cap, and remove the 5 crankshaft bearing caps, 5 lower bearings and 2 lower thrust washers (No. 3 crankshaft bearing cap only).
NOTICE: Be careful not to damage the cylinder block.
HINT:
^ Keep the lower bearing and bearing cap together.
^ Arrange the bearing caps and lower thrust washers in correct order.
d. Lift out the crankshaft.
e. Remove the 2 upper thrust washers.
HINT:
^ Arrange the upper thrust washers in correct order.
^ Keep the upper bearings together with the cylinder block.
f. Clean each crankshaft journal and bearing.
g. Check each crankshaft journal and bearing for pitting and scratches.
If the journal or bearing is damaged, replace the bearings.
If necessary, replace the crankshaft
h. Install the 10 crankshaft bearings and 5 crankshaft bearing caps with the 30 bolts (See step 26). Do not install the crankshaft.
i. Using a cylinder gauge, measure the inside diameter of the crankshaft bearing.
Bearing inside diameter: 66.986 - 67.000 mm (2.6372 - 2.6378 inch)
j. Measure the diameter of the crankshaft journal (See step 17).
k. Subtract the crankshaft journal diameter measurement from the crankshaft bearing inside diameter measurement.
Standard clearance
Maximum clearance
If the oil clearance is greater than maximum, replace the bearings. If necessary, replace the crankshaft.
HINT: If using a standard bearing, replace it with one having the same number. If the number of the bearing cannot be determined, select the correct bearing by adding together the numbers imprinted on the cylinder block and crankshaft, then refer to the table for the appropriate bearing number. There are 5 sizes of the standard bearings. For No. 1 and No. 5 position bearings, use bearings marked 3, 4, 5, 6 and 7. For others position bearings, use bearings marked 1, 2, 3, 4 and 5.
No. 1, No. 5
EXAMPLE: Cylinder block"08" + Crankshaft "06" =
Total number 14 (Use bearing"4" (Upper), "5" (Lower))
Others
EXAMPLE:
Cylinder block "08" + Crankshaft "06" =
Total number 14 (Use bearing "2" (Upper), "3" (Lower))
Reference
Cylinder block crankshaft journal bore diameter (A)
Crankshaft crankshaft journal diameter (B)
Standard bearing center wall thickness
No. 1 and No. 5
Others
l. Remove the 10 bolts, 20 nuts, 5 crankshaft bearing caps and 5 lower crankshaft bearing (See steps (a) to (c) above).
m. Remove the 5 upper crankshaft bearings from the cylinder block.
HINT: Arrange the bearing caps, bearings and thrust washers in correct order.
9. INSPECT CYLINDER BLOCK SUB-ASSY
a. Clean the cylinder block.
1. Using a gasket scraper, remove all the gasket material from the top surface of the cylinder block.
2. Using a soft brush and solvent, thoroughly clean the cylinder block.
NOTICE: If the cylinder is washed at high temperatures, the cylinder liner sticks out beyond the cylinder block, so always wash the cylinder block at a temperature of 45° or less.
b. Inspect for flatness.
1. Using a precision straight edge and feeler gauge, measure the surfaces contacting the cylinder head and main bearing cap for warpage.
Maximum warpage: 0.07 mm (0.0028 inch)
If warpage is greater than maximum, replace the cylinder block sub-assy.
c. Visually check the cylinder for vertical scratches. If deep scratches are present, replace the cylinder block sub-assy.
d. Inspect the cylinder bore diameter.
HINT: There are 3 sizes of the standard cylinder bore diameter, marked "1", "2" and "3" accordingly. The mark is stamped on the top of the cylinder block.
If deep scratches are present, replace the cylinder block sub assy.
1. Using a cylinder gauge, measure the cylinder bore diameter at positions A, B and C in the thrust and axial directions.
Standard diameter
Maximum diameter: 91.229 mm (3.5917 inch)
If the diameter is greater than maximum, replace the cylinder block sub-assy.
e. Remove the cylinder ridge.
If the wear is less than 0.2 mm (0.008 inch), using a ridge reamer, grind the top of the cylinder.
10. INSPECT W/ PIN PISTON SUB-ASSY
a. Clean the piston.
1. Using a gasket scraper, remove the carbon from the piston top.
2. Using a groove cleaning tool or broken ring, clean the piston ring grooves.
3. Using solvent and a brush, thoroughly clean the piston.
NOTICE: Do not use a wire brush.
b. Inspect the piston oil clearance.
HINT: There are 3 sizes of the standard piston diameter, marked "1", "2" and "3" accordingly. The mark is stamped on the piston top.
1. Using a micrometer, measure the piston diameter at right angles to the piston pin center line, 28.1 mm (1.106 inch) from the piston head.
Piston diameter
2. Measure the cylinder bore diameter in the thrust directions (See step 2 above).
3. Subtract the piston diameter measurement from the cylinder bore diameter measurement.
Standard oil clearance: 0.080 - 0.101 mm (0.0031 - 0.0040 inch)
Maximum oil clearance: 0.121 mm (0.0048 inch)
If the oil clearance is greater than maximum, replace all the 8 pistons. If necessary, replace the cylinder block sub-assy.
HINT: Use a new cylinder block:
^ Use a piston with the same number mark as the cylinder diameter marked on the cylinder block.
^ The shape of the piston varies for the LH and RH banks.
The LH piston is marked with "3L", the RH piston with "3R".
c. Inspect the piston pin fit.
1. At 60°C (140°F), you should be able to push the piston pin into the piston pin hole with your thumb.
d. Using a micrometer, measure the piston pin diameter.
Piston pin diameter: 21.997 - 22.006 mm (0.8660 - 0.8664 inch)
11. INSPECT PISTON RING SET
a. Inspect the piston ring groove clearance.
1. Using a feeler gauge, measure the clearance between new piston ring and the wall of the ring groove.
Ring groove clearance
If the clearance is not as specified, replace the piston.
b. Inspect the piston ring end gap.
1. Insert the piston ring into the cylinder bore.
2. Using a piston, push the piston ring a little beyond the bottom of the ring travel, 105 mm (4.13 inch) from the top of the cylinder block.
3. Using a feeler gauge, measure the end gap.
Standard end gap
Maximum end gap
If the end gap is greater than maximum, replace the piston ring. If the end gap is greater than maximum, even with a new piston ring, replace the cylinder block sub-assy.
12. INSPECT CONNECTING ROD SUB-ASSY
a. Using a rod aligner and feeler gauge, check the connecting rod alignment.
1. Check for bend.
Maximum bend: 0.05 mm (0.0020 inch) per 100 mm (3.94 inch)
If bend is greater than maximum, replace the connecting rod sub-assy.
2. Check for twist
Maximum twist: 0.15 mm (0.0059 inch) per 100 mm (3.94 inch)
If twist is greater than maximum, replace the connecting rod sub-assy.
13. INSPECT PISTON PIN OIL CLEARANCE
a. Inspect the piston pin oil clearance.
1. Using a caliper gauge, measure the inside diameter of the connecting rod bushing.
Bushing inside diameter: 22.005 - 22.014 mm (0.8663 - 0.8667 inch)
2. Subtract the piston pin diameter measurement (See step 10) from the bush inside diameter measurement.
Standard oil clearance: 0.005 - 0.011 mm (0.0002 - 0.0004 inch)
Maximum oil clearance: 0.05 mm (0.0020 inch)
If the oil clearance is greater than maximum, replace the bush. If necessary, replace the piston and piston pin as a set.
14. REMOVE CONNECTING ROD SMALL END BUSH
a. Using SST and a press, press out the bush.
SST 09222-30010
15. INSPECT CONNECTING ROD BOLT
a. Using vernier calipers, measure the tension portion of the connecting rod bolt.
Standard diameter: 7.200 - 7.300 mm (0.2835 - 0.2874 inch)
Minimum diameter: 7.00 mm (0.2756 inch)
If the diameter is less than minimum, replace the bolt.