Correspondence | Selectable Component | Selection criterion | Selection method |
Between cylinder block and crankshaft | main bearing | Main bearing class (bearing thickness) | Determined by matching the class of the main bearing housing in the cylinder block (body inner diameter) and class of the crankshaft main journal (neck outside diameter) |
Between cylinder block and piston | Piston and piston pin assembly (Pistons are supplied complete with piston pins) | Piston class (skirt diameter) | Piston class = cylinder diameter class (inner diameter of the cylinder) |
The class marking embossed on each part represents the geometric dimension class measured on the new part. This class does not apply to reusable parts.
Perform precise geometric measurements on reused or repaired parts. Determine the class by comparing the measurement results with the values presented in the selection tables for the individual components
For more detailed information on how to measure each part, reuse rates and how to select components in place, see the text.
Pistons selection procedure
When a new cylinder block is used
Check cylinder diameter class («1», «2» or «3») at the bottom of the rear side of the cylinder block and select the piston of the appropriate class.
Note: The shape of the piston head differs from engine to engine, as does the location of the markings shown in fig.
When an old cylinder block is reused
1. Measure the inside diameter of the cylinders.
2. Determine the diameter class by comparing the measurement results with the values of the internal diameter of the cylinders presented in «Pistons selection table».
3. Select a piston of the appropriate class.
Pistons selection table
Engine CR14DE, unit - mm.
Class | 1 | 2 | 3 |
Cylinder inner diameter | 73,000-73,010 | 73,010-73,020 | 73,020-73,030 |
Skirt diameter | 72,980-72,990 | 72,990-73,000 | 73,000-73,010 |
The procedure for selecting main bearings
When a new cylinder block and crankshaft is used
1. Horizontal lines in «Selection table for main bearings» correspond to the class of the main bearing housing («0», «1», «2» or «3»), embossed at the bottom of the rear side of the cylinder block.
2. Find the journal diameter class («0», «1», «2» or «3»), embossed on the front of the crankshaft, in a vertical column «Selection tables for main bearings».
3. Select the class of the main bearing (STD1 to STD7) at the intersection of a horizontal line and a vertical column in «Selection table for main bearings».
When the old cylinder block and crankshaft are reused
1. Measure the inner diameter of the main bearing housing in the cylinder block and the diameter of the main journal.
2. Match the measurement results with the values in the horizontal line «Inner diameter of the main bearing housing in the cylinder block», presented in «Selection table for main bearings».
3. Match the measurement results with the values in the vertical column «Crankshaft journal diameter», presented in «Selection table for main bearings».
4. Select the class of the main bearing (STD1 to STD7) at the intersection of a horizontal line and a vertical column in the following lookup table.
Selection table for main bearings
Internal diameter of the main bearing in the cylinder block | - | 49,004/49,000 | 49,008/49,004 | 49,012/49,008 | 49,016/49,012 | |
Outer diameter of the main journal | class label (knocked out) | - | 0 | 1 | 2 | 3 |
44,970/44,966 | 0 | Bearing class
Bearing thickness Color coding | STD1 2.002/2.006 red | STD2 2.004/2.008 green | STD3 2.006/2.010 Yellow | STD4 2.006/2.012 blue |
44,966/44,962 | 1 | Bearing class
Bearing thickness Color coding | STD2 2.004/2.008 green | STD3 2.006/2.010 yellow | STD4 2.000/2.012 blue | STD5 2.010/2.014 pink |
44,962/44,958 | 2 | Bearing class
Bearing thickness Color coding | STD3 2.006/2.010 yellow | STD4 2.008/2.012 blue | STD5 2.010/2.014 single | STD6 2.012/2.016 white |
44,958/44,954 | 3 | Bearing class
Bearing thickness Color coding | STD4 2.000/2.012 blue | STD5 2.010/2.014 pink | STD6 2.012/2.016 white | STD7 2.014/2.018 blue/yellow |
Guidelines for the use of undersized bearings
If the specified main bearing oil clearance cannot be achieved with standard size main bearings, use undersized bearings.
When using an undersized bearing, measure the inside diameter of the main bearing with the bearing installed and regrind the main journal so that the oil clearance is correct.
Reduced oversize main bearing table
Size | Thickness |
Repair size reduced by 0.25 | 2,123-2,131 |
Attention: When regrinding the main journals (1) keep the rounded corners for undersized bearings «R».