AR03.10-B-7311TA | Remove/install piston rings | 12.02.16 |
Cumbustion engine 902.9 with Vehicle 693
Cumbustion engine 904.9 with Vehicle 693.### #D, 694.### #D, 958.### #D, 979.0## #D
Cumbustion engine 906.9 with Vehicle 693.### #D, 695.### #D, 958.### #D
W03.10-1037-06
1 Dual trapezoid ring (channel I)
2 Compression ring with internal angle (channel II)
3 Upper chamfer ring with expansion helical spring (channel III)
3.1 Expansion helical spring
4 Piston
5 Pliers
5.1 Knurled bolt
A Expansion helical spring displacement
B Expansion value
Arrow Expansion helical spring opening
| Remove | ||
1 | Remove the piston (4) | ||
2 | Fix the connecting rod with piston (4) in the vise | ||
3 | Adjust the pliers (5) with the knurled bolt (5.1) | Before disassembling the rings (1, 2, 3) adjust the maximum expansion value allowed (B). | |
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4 | Disassemble the rings (1, 2, 3) from the piston(4) in the sequence from up to down | Remove residues of combustion from the rings (1, 2, 3) and the piston channels (4) | |
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| Check | ||
5 | Check the pistons for damages and/or wearing in the rings channels. In the case of reuse, carefully remove the charcoal residues in the channels and in the piston upper part | Replace the piston when it presents damages and/or wearing in the rings channels. | |
6 | Check the rings (1, 2, 3) for damage in the coating | If necessary, replace the respective piston rings (1, 2, 3). | |
| Measure | ||
7 | Measure the rings play (1, 2, 3) in the cylinder | Remove the expansion helical spring (3.1) from the ring (3) and assemble the rings (1, 2, 3) in the not worn out area of the cylinder (above the inversion point of the 1st ring) and measure the play. | |
Universal blades gauge from 0.05 to 1 mm | |||
If the play is outside the specification, replace the respective rings. | |||
| Install | ||
8 | Install the expansion helical spring (3.1) in the ring (3) | The displacement (A) of the opening (arrow) of the expansion helical spring (3.1) in relation to the opening (ends) of the ring (3) must be of approximately 180°. | |
9 | Adjust the pliers (5) with the knurled bolt (5.1) | Before assembling the rings (1, 2, 3) adjust the maximum expansion value allowed (B). | |
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10 | Assemble the rings (1, 2, 3) in the piston from down to up | Observe the assembling position for the rings, the "TOP" identification must be faced to the piston head. The displacement (A) of the opening (arrow) of the expansion helical spring (3.1) in relation to the opening (ends) of the ring (3) must be of approximately 180°. | |
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11 | Install the piston (4) |
Check values for piston rings
Número | Denominação | Engine 902.9; 904.9, 906.9 | |||
BE03.10-B-1001-05A | Clearance between the piston ring points | channel ring I | new | mm | 0.35...0.55 |
wear limit | mm | 1.0 | |||
channel ring II | new | mm | 0.40...0.60 | ||
wear limit | mm | 1.0 | |||
channel ring III | new | mm | 0.25...0.50 | ||
wear limit | mm | 1.0 | |||
BE03.10-B-1002-05A | Piston ring opening | mm | 43 | ||
000 589 37 37 00
Pliers