30
COMPILER TECO/ATL
REG. CODE
1-5302-296
MODEL N°
50510
DATE OF ISSUE
01.89
REVISION
02
ENDORSED
DATE
17.04.2003
54
48
49
50
51
52
53
VIII
Lubricate the following parts with oil before mounting: the
piston pin, the piston, the cylinder and the big-end bearing
Piston - Refitting
Connect piston to connecting rod in a way that the combustion
chamber center
b
is under nozzle tip
a
.
Lubricate piston pin and introduce it into the piston by exerting
pressure with your thumb.
Check that both circlips are well inside their seats.
Piston clearance
A
= Piston clearance
B
= Copper head gasket
A
(0.65÷0.70 mm) is determined by placing the piston at top dead
center and measuring with a feeler gauge and straight edge, the
distance the piston is below or above the cylinder face. A copper
gasket
B
(available in various thicknesses) is then selected to
ensure the clearance ìs correct.
Gasket are available in the following thicknesses: 0.45; 0.50; 0.55;
0.60; 0.65; 0.70; 0.75; 0.80; 0.85; 0.90; 0.95; 1.00 mm.
When remounting the big-end bearings, remember to
thoroughly clean the parts and generously lubricate them to
prevent seizure when the engine is started up for the first time
CONNECTING ROD
Remove oil pan and the pick-up tube.
Remove connecting rocis and check as follows,
All connecting rod/piston units should be fitted back into the
corresponding cylinders; mark them to avoid mistakes.
See page 31 for specifications as to the tightening of the connecting
rod big end bearing.
Connecting rod small end bearing and pin
Dimensions and clearance (mm)
A
= 141.95÷142.05
C
= 25.020÷25.030 (with machined bushing in place)
D
= 24.995÷25.000
(C-D)
= 0.020÷0.035
(C-D)
limit value = 0.070
DISASSEMBLY/REASSEMBLY
