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