Lombardini CHD series - Piston Rings; Piston weight; Piston rings - End gaps; Piston rings - Clearance between grooves

- 37 - Workshop Manual LDW CHD _ cod. 1.5302.345 - 6° ed_rev. 05
A
mm21,0÷70,0
*A
B
mm80,0÷20,0 mm59,0÷60,0
C
mm80,0÷50,0 mm80,0÷50,0
A mm05,0÷03,0=
A mm05,0÷03,0=
A mm05,0÷02,0=
4
51
49
48
47
49
49
50
Piston weight
Weigh the pistons when replacing them in order to avoid
unbalance.
The difference in weight should not exceed 6 g.
NATURALLY ASPIRA-
TED LDW
Ref.
LDW TURBO
Disassembly / Reassembly
Piston rings - Fitting sequence
A* = 1st chrome plated compression ring *
B = 2nd tapered compression ring *
C = 3rd spiral spring oil scraper ring
* Therstringin the LDWTURBO engine isdifferentfrom the
NATURALLY ASPIRATED version, it has a trapezoidal cross-
section.
Assemble the segments with the TOP marking facing the piston
crown.
Piston rings - Clearance between grooves
Piston rings - End gaps
Place piston rings into the cylinder and measure end gap A.
1st ring
2nd ring
3rd ring