BOOK CODE
1-5302-556
MODEL No.
50839
DATE OF ISSUE
01-94
REVIEW 02
DATE
30-11-2001
APPROVAL
TECO/ATL AUTHOR
12
Piston ring - Clearances among slots (mm)
3LD 450, 3LD 451/S, 3LD 510, 3LD 510S, picture28
A = 0.08 ÷ 0.09
B = 0.06 ÷ 0.07
C = 0.05 ÷ 0.06
4LD 640, 4LD 705, 4LD 820, picture 29
A = 0.12 ÷ 0.14
B = 0.07 ÷ 0.09
C = 0.07 ÷ 0.09
D = 0.06 ÷ 0.08
Piston ring assembly order
3LD 450, 3LD 451/S, 3LD 510, 3LD 510/S, picture 30
A = slot for first piston ring (chromium plated)
B = slot for piston ring segment (torsional)
C = slot for third piston ring (oil scraper ring)
4LD 640, 4LD 705, 4LD 820, picture 31
A = slot for first piston ring (chromium plated)
B = slot for second piston ring (torsional)
C = slot for third piston ring(torsional)
D = slot for fourth piston ring(oil scrarper ring)
Note: before inserting the piston in the cylinder, oil the piston ringwith
engine oil and turn them, thus the cuts are misaligned.
Piston reassembly
Couple the piston with the connecting rod, thus the combustion
chamber centre B is perpendicularly under end A of the nozzle
housed inside the head.
Lubricate the piston pin and insert it in the piston, lightly pressing
with your thumb.
Make sure that the two stop rings are well housed inside their
seats.
28
30
32
33
31
29
V DISASSEMBLY/REASSEMBLY
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