Nanni T4.155 seriers, Workshop Manual

Page: 167 / 191

60300140 (
indice A
) 4 CYLINDERS WORKSHOP MANUAL 167/191
ADVICE:
* Never separate the shell bearing from the connecting rod
and the connecting rod cap.
* Lay out piston-connecting rod assemblies in the
disassembly order.
8. MEASURE THE CRANKSHAFT AXIAL
CLEARANCE
Use a dial gauge to measure the crankshaft axial clearance while
pushing it forwards and backwards using a screwdriver.
Nominal axial clearance: 0.040 – 0.240 mm
Axial clearance limit: 0.30 mm
Replace the stop shims using a set when the clearance limit is
exceeded.
Axial shim thickness:
Nominal size
2.430 – 2.480 mm
Dimension less than 0.25 2.555 – 2.605 mm
Dimension less than 0.125 2.493 – 2.543 mm
9. REMOVE CRANKSHAFT BEARING CAPS AND
VERIFY THE LUBRICATION CLEARANCE
a. Gradually loosen and remove the assembly bolts of the
crankshaft bearing cap, working in several steps and in
compliance with the order illustrated opposite.
b. Use the bolts removed from the crankshaft bearing connecting
rod cap as a lever moving the crankshaft bearing connecting rod
caps backwards and forwards and remove the crankshaft
bearing connecting rod caps, the lower shell bearings and the
lower stop bushes (only on crankshaft No.5 bearing connecting
rod cap).
ADVICE:
* leave the lower shell bearings fitted in the bearing cap.
* lay out the bearing caps and lower end shims in the
disassembly order
.