The size group number is stamped on each part and corresponds to the specific size range of the new part. For used parts, this designation of the size group is not valid.
Repaired or used parts must be measured with a micrometer. Comparing the tabular data with the measurement results, determine the size group of the part.
Information about standards, methods of measurement and selection of parts is given in the text of this manual.
Piston
When using a new cylinder block
Determine the size group of the cylinder by the mark located on the rear left side of the block (L) and pick up a piston of the same size group.
A. Correction stamp.
B. Standard stamp.
C. Dimensional group of the opening of the first cylinder.
D. Dimensional group of the hole of the second cylinder.
E. Dimensional group of the hole of the third cylinder.
F. Fourth cylinder bore size group.
G. No. 1 spore bed size group.
N. Dimensional group of the bed of the main bearing of the spore No. 2.
I Dimensional group of the bed of the main bearing spores No. 3.
J. No. 4 spore main bearing bed size group.
K. Dimensional group of the bed of the main bearing of the spore No. 5.
L. Location of size groups. The arrow indicates the side of the front of the engine.
Note. If there is a correction stamp on the cylinder block, these values \u200b\u200bmust be used as more relevant to reality.
When using a used cylinder block
1. Measure the inside diameter of the cylinder bore (see the previous section of the chapter).
2. Determine the size group of the cylinder bore by comparing the results obtained with the values in «piston selection table».
3. Select a piston of the same size group.
A. Identification code.
B. Front mark.
C. Subgroup number.
D. Piston size group number.
Pistons selection table
Note. The pistons are supplied complete with piston pins.