J 452700-012 Piston Rings, Replace (Y 17 DT)
Note! Piston with con-rod removed
1. Remove piston rings
- Using piston ring pliers (1)
- 3 off, spiral-type expanders
|
|
2. Clean ring grooves
- Note! Remove oil carbon residue from piston ring groove with
broken and ground-down piston ring
3. Measure piston ring gap
- Insert new piston rings into cylinder
- 3 off
- Measure piston ring gap using feeler gauge
Piston rings
|
Permissible ring gap
|
1st compression ring (T)
|
0.25 – 0.35 mm
|
2nd compression ring (2T)
|
0.20 – 0.30 mm
|
Oil scraper ring
|
0.20 – 0.40 mm
|
Size marks of compression rings
|
|
1st Ring
|
2nd Ring
|
Standard
|
none
|
none
|
Oversize 0.50 mm
|
50
|
50
|
Oversize 1.00 mm
|
100
|
100
|
Size marks for oil scraper rings
|
Standard
|
none
|
Oversize 0.50 mm
|
blue
|
Oversize 1.00 mm
|
yellow
|
|
|
4. Measure height clearance
- Insert piston rings into piston ring groove
- Note! Observe marks on compression rings ("T", "2T" points
up)
- 1st compression ring (T)
- 2nd compression ring (2T)
- Oil scraper ring
- Measure height clearance using feeler gauge
Piston rings
|
Permissible vertical play
|
1st compression ring (T)
|
0.090 – 0.150 mm
|
2nd compression ring (2T)
|
0.040 – 0.150 mm
|
Oil scraper ring
|
0.025 – 0.150 mm
|
|
|
5. Install piston rings
- Insert oil scraper ring spiral-type expander into piston ring
groove
- Install oil scraper ring
- Install compression rings
- Note! Observe marks on compression rings
- 1st compression ring (T)
- 2nd compression ring (2T)
|
|
6. Piston Rings, Replace
|