Part 2

INSPECTION(continued)

17. INSPECT CYLINDER BORE
(a) Using a cylinder gauge, measure the cylinder bore diameter at positions A and B in the thrust and axial directions.
Standard diameter: 88.500 to 88.513 mm (3.4843 to 3.4847 inch)
Maximum diameter: 88.633 mm (3.4894 inch)
If the average diameter of the 4 positions is greater than the maximum, replace the cylinder block.

18. INSPECT PISTON
(a) Using a gasket scraper, remove the carbon from the piston top.

(b) Using a groove cleaning tool or a broken ring, clean the piston ring grooves.

(d) Using a micrometer, measure the piston diameter at right angles to the piston pin hole, and at the piston 44.3 mm (1.7441 inch) from the piston head.
Standard piston diameter: 88.469 to 88.479 mm (3.4830 to 3.4834 inch)
If the diameter is not as specified, replace the piston.
19. INSPECT PISTON OIL CLEARANCE
(a) Subtract the piston diameter measurement from the cylinder bore diameter measurement.
Standard oil clearance: 0.021 to 0.044 mm (0.0008 to 0.0017 inch)
Maximum oil clearance: 0.10 mm (0.0039 inch)
If the oil clearance is greater than the maximum, replace all the pistons. If necessary, replace the cylinder block.

20. INSPECT RING GROOVE CLEARANCE
(a) Using a feeler gauge, measure the clearance between a new piston ring and wall of the ring groove.

Standard Ring Groove Clearance:

If the groove clearance is not as specified, replace the piston.

21. INSPECT PISTON RING END GAP
(a) Using a piston, push the piston ring a little beyond the bottom of the ring travel, 110 mm (4.33 inch) from the top of the cylinder block.

(b) Using a feeler gauge, measure the end gap.

Standard End Gap:

Maximum End Gap:

If the end gap is greater than the maximum, replace the piston ring. If the end gap is greater than the maximum, even with a new piston ring, replace the cylinder block.

22. INSPECT PISTON PIN OIL CLEARANCE
(a) Using a caliper gauge, measure the piston pin bore diameter.
Standard piston pin bore diameter: 22.001 to 22.010 mm (0.8662 to 0.8665 inch)

If the diameter is not as specified, replace the piston.

(b) Using a micrometer, measure the piston pin diameter.
Standard piston pin diameter: 21.997 to 22.006 mm (0.8660 to 0.8664 inch)

If the diameter is not as specified, replace the piston pin.

(c) Using a caliper gauge, measure the connecting rod small end bore diameter.
Standard connecting rod small end bore diameter: 22.005 to 22.014 mm (0.8663 to 0.8667 inch)

If the diameter is not as specified, replace the connecting rod.

(d) Subtract the piston pin diameter measurement from the piston pin bore diameter measurement.
Standard oil clearance: 0.001 to 0.007 mm (0.00004 to 0.0003 inch)
Maximum oil clearance: 0.010 mm (0.0004 inch)
If the oil clearance is greater than the maximum, replace the connecting rod. If necessary, replace the piston and piston pin as a set.
(e) Subtract the piston pin diameter measurement from the connecting rod small end bore diameter measurement.
Standard oil clearance: 0.005 to 0.011 mm (0.0002 to 0.0004 inch)
Maximum oil clearance: 0.011 mm (0.0004 inch)
If the oil clearance is greater than the maximum, replace the connecting rod. If necessary, replace the connecting rod and piston pin as a set.

23. INSPECT CONNECTING ROD BOLT
(a) Using vernier calipers, measure the tension portion diameter of the bolt.
Standard diameter: 7.2 to 7.3 mm (0.283 to 0.287 inch)
Minimum diameter: 7.0 mm (0.276 inch)
If the diameter is less than the minimum, replace the connecting rod bolt.

24. INSPECT CONNECTING ROD SUB-ASSEMBLY
(a) Using a connecting rod aligner and feeler gauge, check the connecting rod alignment.
(1) Check for misalignment.
Maximum misalignment: 0.05 mm (0.0020 inch) per 100 mm (3.94 inch)
If the misalignment is greater than the maximum, replace the connecting rod.

(2) Check for twist.
Maximum twist: 0.15 mm (0.0059 inch) per 100 mm (3.94 inch)
If the twist is greater than the maximum, replace the connecting rod.

25. INSPECT CRANKSHAFT
(a) Using a dial indicator and V-blocks, measure the circle runout as shown in the illustration.
Maximum circle runout: 0.03 mm (0.0012 inch)
If the taper and distortion are greater than the maximum, replace the crankshaft.

(b) Using a micrometer, measure the diameter of each main journal.
Standard diameter: 54.988 to 55.000 mm (2.1649 to 2.1654 inch)
If the diameter is not as specified, check the crankshaft oil clearance.
(c) Check each main journal for taper and distortion as shown in the illustration.
Maximum taper and distortion: 0.003 mm (0.0001 inch)
If the taper and distortion are greater than the maximum, replace the crankshaft.

Standard Diameter (Reference):

(d) Using a micrometer, measure the diameter of each crank pin.
Standard diameter: 47.990 to 48.000 mm (1.8894 to 1.8898 inch)
If the diameter is not as specified, check the connecting rod oil clearance.
(e) Inspect each crank pin for taper and distortion as shown in the illustration.
Maximum taper and distortion: 0.003 mm (0.0001 inch)
If the taper and distortion are greater than the maximum, replace the crankshaft.
26. INSPECT CRANKSHAFT THRUST CLEARANCE
(a) Install the main bearing cap.

(b) Using a dial indicator, measure the thrust clearance while prying the crankshaft back and forth with a screwdriver.
Standard thrust clearance: 0.04 to 0.24 mm (0.0016 to 0.0095 inch)
Maximum thrust clearance: 0.30 mm (0.0118 inch)
If the thrust clearance is greater than the maximum, replace the thrust washers as a set.

HINT: The thrust washer thickness is 1.93 to 1.98 mm (0.0760 to 0.0780 inch).

27. INSPECT CRANKSHAFT OIL CLEARANCE
(a) Check the crank journal and bearing for pitting and scratches.
(b) Install the crankshaft bearing.
(c) Place the crankshaft on the cylinder block.

(d) Lay a strip of Plastigage across each journal.
(e) Examine the front marks and numbers and install the bearing caps on the cylinder block.

HINT: A number is marked on each main bearing cap to indicate the installation position.

(f) Install the main bearing cap.

NOTICE: Do not turn the crankshaft.

(g) Remove the main bearing caps.

(h) Measure the Plastigage at its widest point.
Standard oil clearance: 0.017 to 0.040 mm (0.0007 to 0.0016 inch)
Maximum oil clearance: 0.060 mm (0.0024 inch)

NOTICE: Remove the Plastigage completely after the measurement.

If the oil clearance is greater than the maximum, replace the crankshaft bearing. If necessary, replace the crankshaft.

HINT:
- If replacing a bearing, select a new one with the same number. If the number of the bearing cannot be determined, calculate the correct bearing number by adding together the numbers imprinted on the cylinder block and crankshaft. Then select a new bearing with the calculated number. There are 4 sizes of standard bearings, marked "1", "2", "3" and "4" accordingly.
- EXAMPLE: Cylinder block "3" + Crankshaft "5" = Total number 8 (Use bearing "3")

Standard Cylinder Block Journal Bore Diameter:

Standard Crankshaft Journal Diameter - Part 1:

Standard Crankshaft Journal Diameter - Part 2:

Standard Bearing Center Wall Thickness:

28. INSPECT CRANKSHAFT BEARING CAP SET BOLT
(a) Using vernier calipers, measure the tension portion diameter of the bolts.
Standard diameter: 7.3 to 7.5 mm (0.287 to 0.295 inch)
Minimum diameter: 7.2 mm (0.284 inch)
If the diameter is less than the minimum, replace the bolt.