How to Select Piston and Bearing
* For the service parts, the grade for fitting cannot be selected between a piston pin and a connecting rod. (Only 0 grade is available.) The information at the shipment from the plant is described as a reference.
How to Select Piston and Bearing
DESCRIPTION
The identification grade stamped on each part is the grade for the dimension measured in new condition. This grade cannot apply to reused parts.
For reused or repaired parts, measure the dimension accurately. Determine the grade by comparing the measurement with the values of each selection table.
For details of the measurement method of each part, the reuse standards and the selection method of the selective fitting Darts.
HOW TO SELECT PISTON
When New Cylinder Block is Used
Check the cylinder bore grade (1, 2, or 3) on rear side of cylinder block, and select a piston of the same grade.
The piston is available with piston pin as a set for the service part. (Only 0 grade piston pin is available.)
When Cylinder Block is Reused
1. Measure the cylinder block bore inner diameter.
2. Determine the bore grade by comparing the measurement with the values under the cylinder bore inner diameter of the "Piston Selection Table".
3. Select the piston of the same grade.
Piston Selection Table:
NOTE: The piston is available together with piston pin as an assembly.
The piston pin (piston pin bore) grade is provided only for the parts installed at the plant. For service parts, no piston pin grades can be selected. (Only 0 grade is available.)
No second grade mark is available on piston.
HOW TO SELECT CONNECTING ROD BEARING
When New Connecting Rod and Crankshaft are Used
Check pin diameter grade number (0, 1, or 2) stamped in front of crankshaft, and select connecting rod bearing of same grade number.
NOTE: There is no grading for connecting rod big end inner diameter.
When Crankshaft and Connecting Rod are Reused
1. Measure dimensions of the big end inner diameter of connecting rod and outer diameter of crankshaft pin individually.
2. Confirm the big end inner diameter of connecting rod is within the standard value.
Connecting Rod Bearing Selection Table:
3. Apply the measured dimension to the "Connecting Rod Bearing Selection Table".
4. Determine the grade of crankshaft pin diameter grade by comparing the measurement with the values under the crankshaft pin outer diameter of the "Connecting Rod Bearing Selection Table".
5. Select the connecting rod bearing of the same grade.
Undersize Bearings Usage Guide
When the specified oil clearance is not obtained with standard size connecting rod bearings, use undersize (US) bearings.
Bearing Undersize Table:
When using undersize bearing, measure the bearing inner diameter with bearing installed, and grind the crankshaft pin so that the oil clearance satisfies the standard.
CAUTION: In grinding the crankshaft pin to use undersize bearings, keep the fillet R (All crankshaft pins).
HOW TO SELECT MAIN BEARING
When New Cylinder Block and Crankshaft are Used
Bearing Housing Grade / Cylinder Bore Grade - Location:
Main Bearing Selection Table:
1. "Main Bearing Selection Table" rows correspond to bearing housing grade on rear left side of cylinder block.
Main Bearing Selection Table:
2. Apply journal diameter grade stamped on crankshaft front side to column in "Main Bearing Selection Table".
3. Find sign (main bearing grade) at crossing of row and column in "Main Bearing Selection Table".
When Cylinder Block and Crankshaft are Reused
1. Measure inner diameter of cylinder block main bearing housing and outer diameter of crankshaft journal.
2. Find measured dimension in "Cylinder block bearing housing inner diameter" row of "Main Bearing Selection Table".
3. Find the measured dimension in "Crankshaft main journal diameter" column in the selection table.
Main Bearing Grade Table (All Journals):
4. Select main bearing grade at the point where selected row and column meet in the selection table.
Undersize Bearing Usage Guide
Bearing Undersize Table:
Use undersize (US) bearing when oil clearance with standard size main bearing is not within specification.
When using undersize (US) bearing, measure the bearing inner diameter with bearing installed, and grind journal until oil clearance falls within specification.
CAUTION: Keep fillet R when grinding crankshaft journal in order to use undersize bearing (All journals).