F1.56
TC 449 2011/2012 I.E.
TE 449 - 511 2011/2012 I.E.
TXC 449 - 511 2011/2012 I.E.
SMR 449 2011 I.E.
SMR 511 2011/2012 I.E.
H06461
H01756
H01755
ENGINE DISASSEMBLY/REASSEMBLY
Workshop Manual Ed. 03-2012
Piston diameter check
Check
• Measure piston diameter (A) crosswise to piston pin axis.
• Size (B) defines the reading beyond piston pin lower edge.
Technical specifications
Piston diameter
Tolerance group 1
New, transverse
to piston pin axis,
above piston lower
edge by 4 mm
450
97.925
+0.005
mm
- 0.005
480
100.925
+/- 0.005
mm
Piston diameter
Tolerance group 2
New, transverse
to piston pin axis,
above piston lower
edge by 4 mm
450
97.935
+0.005
mm
- 0.005
480
100.935
+/- 0.005
mm
Result:
Piston diameter is outside tolerance values
Action:
Replace piston.
Piston stroke clearance definition
Check
• Piston diameter (B) less cylinder diameter (A) = piston clearance.
Technical specifications
Piston installation
clearance
0.06...0.08 mm
Result:
Piston stroke clearance is outside tolerance values.
Action:
Replace piston and cylinder.
Piston assembly
• Fit piston with the arrow pointing to exhaust side.
Caution
Comply with the markings for cylinders and pistons unit.
The marks denoting cylinder and piston groups must match.