Connecting rod and piston group with a floating pin (VAZ-2114)

To complete the work you will need:

• bore gauge;
• a rod made of soft metal (0.21 mm) or a special mandrel.

Disassembly

1. Remove the piston rings from the piston (see "Piston rings and connecting rod bearings - replacement").

2. Using an awl, pry up and remove the piston pin retaining rings from the grooves.



3. Using a soft metal rod of suitable diameter, push out the piston pin.



4. Remove the piston from the connecting rod.

Selection of pistons for block cylinders

In new engines, the clearance between the piston and the cylinder is 0.025-0.045 mm and is set by installing pistons of the same class as the cylinders.

Note: For information on how to use a bore gauge, see the instructions supplied with the tool or special literature.

1. Using a bore gauge, check the wear of the cylinder walls.



We take measurements in four zones (5, 12, 62 and 112 mm from the top edge of the cylinder) in the longitudinal and transverse directions of the engine. The cylinder does not wear out in the upper belt. Based on the difference in bore gauge readings in different belts, we determine the degree of wear of each cylinder.

Cylinder diameters are divided into five size classes (see table 8.1.5). The class of each cylinder is stamped on the lower bearing surface of the cylinder block.

Table 8.1.5. Cylinder classes by diameter

Designation	Diameter, mm
A	82,00-82,01
IN	82,01-82,02
WITH	82,02-82,03
D	82,03-82,04
Ε	82,04-82,05

Recommendation: Slightly uniform cylinder wear (within 0.05 mm) it is possible to compensate by installing a piston of a different class with a larger diameter.

If the maximum wear is 0.15 mm or more, the cylinders need to be bored and pistons of a repair size installed.

It is possible to bore cylinders by 0.4 mm and 0.8 mm to suit the dimensions of repair pistons.

2. The designations on the piston bottom indicate where:

2 - piston pin hole class;


WITH - piston class;

← - arrow for orienting the piston in the cylinder (should be directed towards the timing drive);

G - piston mass group.



According to the diameter of the hole for the piston pin, pistons are divided into three classes (1, 2, 3) - by 0.004 mm.

According to the outer diameter, pistons are divided into five classes (A, B, C, D, E) - through 0.01 mm (measured in a plane perpendicular to the piston pin, at a distance of 55 mm from the piston bottom).

According to size, pistons are nominal and two repair sizes. Nominal size pistons are not marked. Pistons of the first repair size are manufactured with a diameter increased by 0.4 mm and are marked with the symbol "∆". The pistons of the second repair size have a diameter increased by 0.8 mm and are marked with the symbol "□".

All pistons on the engine must be of the same weight group. Pistons of the nominal group are designated by the symbol "G". Pistons with increased and decreased mass by 5 g are designated "+" and "-" respectively.

The finger class is marked with paint on its end.

Note: The connecting rod and piston group can be equipped with either pins 2108-1004020 with increased wall thickness, or pins 2110-1004020

According to the outer diameter, the fingers are divided into three classes (marking color - blue, green and red), through 0.004 mm.

To facilitate the selection of the pin for the piston hole, the required pin class is indicated on its inner side with paint.



The required pin class is indicated on the connecting rod cap (2). Connecting rods are divided into classes by head weight. The marking is applied to the connecting rod cap by the letter (1)...



...or paint.



[Information copied from the portal: VAZbook]

Warning! The engine must be equipped with connecting rods of the same weight class (see table 8.1.6).

Table 8.1.6. Connecting rod classes by weight

Mass of connecting rod heads, g		Class	Color of marking
Top	Lower
184+2	489+3 495+3 501+3	Φ L B	Red Green -
188+2	489+3 495+3 501+3	X Μ IN	- - -
192+2	489+3 495+3 501+3	C N G	- - Blue

Assembly

We assemble the piston with the connecting rod in the reverse order of disassembly.

Warning: When assembling the connecting rod with the piston, make sure that the marking on the connecting rod and the marking on the piston are on the same side.

When installing the piston into the cylinder, the cylinder number on its connecting rod should face the side of the block where the lug for installing the oil filter is located, and the catalog number should face the front end of the crankshaft.

Table 8.1.7. Piston pin classes by outside diameter and by pin hole diameter

Class	Color of marking	Diameter, mm
		Finger	Piston	Connecting rod
1	Blue	21,970-21,974	21,978-21,982	21,978-21,982
2	Green	21,974-21,978	21,982-21,986	21,982-21,986
3	Red	21,978-21,982	21,986-21,990	21,986-21,990