Engines Iveco C87 / Cursor 87. Manual

Make sure the piston does show any trace of seizing, scoring,
cracking; replace as necessary.

49023

47580

Figure 40

Figure 41

PISTON CONNECTING ROD ASSEMBLY

1. Connecting rod body - 2. Half bearings - 3. Connecting rod cap - 4. Cap fastening screws - 5. Split ring - 6. Scraper ring

with spiral spring - 7. Bevel cut sealing ring - 8. Trapezoidal sealing ring - 9. Piston pin - 10. Piston

Removal of the piston split rings (2) using the pliers 99360184
(1).

Removal

Pistons are equipped with three elastic rings: a sealing ring, a
trapezoidal ring and a scraper ring.

Pistons are grouped into classes A and B for diameter.

49024

Figure 42

Remove the piston pin split rings (2) using the round tipped
pliers (1).

5408

PISTON-CONNECTING ROD ASSEMBLY

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

F2C CURSOR ENGINES

49025

32618

49026

Figure 43

Figure 44

Figure 45

Figure 46

Remove the piston pin (1).

If removal is difficult use the appropriate beater.

Measuring the diameter of the pistons

Measuring the gudgeon pin diameter (1) with a micrometer
(2).

Conditions for correct gudgeon pin-piston
coupling

Lubricate the pin (1) and the relevant housing on the piston
hubs with engine oil; piston must be inserted with a slight
finger pressure and it should not come out by gravity.

47584

Using a micrometer (2), measure the diameter of the piston
(1) to determine the assembly clearance; the diameter should
be measured at the specified value.

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

F2C CURSOR ENGINES

Base - June 2007

MAIN DATA OF PISTON, SNAP RINGS AND PIN

X = 0,6

± 0,15

• The dimension is measured on a ∅ of 113 mm

16552

3513

Figure 47

Check the thickness of the piston ring (2) using a micrometer
(1).

The sealing ring (2) of the 1º cavity is trapezoidal. Clearance
“X” between the sealing ring and its housing is measured by
placing the piston (1) with its ring in the cylinder barrel (3),
so that the sealing ring is half-projected out of the cylinder
barrel.

540842

Piston rings

114053

16552

Check the clearance between the sealing rings (2) and the
relative piston housings (1) using a thikness gauge (3).

36134

Check the opening between the ends of the sealing rings (1),
using a thickness gauge (2), entered in the cylinder barrel (3).

If the distance between ends is lower or higher than the value
required, replace split rings.

Figure 48

Figure 49

Figure 50

Figure 51

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

F2C CURSOR ENGINES

114054

Figure 52

MAIN DATA - BUSH, CONNECTING ROD, PIN AND HALF-BEARINGS

* Values to be obtained after installing the bush

When fitting the connecting rods, check that all of them are of same weight class and from the same supplier. The
connecting rod/cap is of ”torn” type; before assembly verify that the connecting rod is not damaged. Each connecting
rod can assembled with the relative cap only. If the cap is assembled on the reverse side, the connecting rod must be
rejected.

540830

CONNECTING ROD

1 Between the connecting rod bush and the connecting rod profile there must be a distance > 0.4 mm.
2 On the external breaking line, gap area allowed must be < 5 mm

3 No cracks are allowed in the threaded area.

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

F2C CURSOR ENGINES

Base - June 2007

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Engines Iveco C87 / Cursor 87. Manual - part 28