Checking Head Mating Surface On Cylinder Block; Crankshaft; Measuring Main Journals And Crank Pins - Iveco daily euro 4 Repair Manual

D E 4
AILY URO
Checking head mating surface on cylinder
block
Figure 122
See that the head mating surface, on the cylinder block, has
no deformation.
This check can be made, after taking out the grub screws (3),
with a surface plate spread with carbon black or with a
calibrated rule (1) and a feeler gauge (2). After ascertaining
the areas of deformation, level the bearing surface with a
grinding machine.
NOTE The crankcase can only be surfaced after making
sure that, on completing the work, the piston
protrudes from the cylinder liner by no more than
the prescribed value.
Figure 123
∅ MIN
∅ MAX
∅ MIN
∅ MAX
TABLE IN WHICH TO ENTER THE MEASUREMENTS OF THE CRANKSHAFT MAIN JOURNALS AND CRANKPINS
NOTE The main journals and crankpins must always be
ground to the same undersize class.
The undersizing performed, on the main journals or
crankpins, must be marked by punching on the side
of crank arm no. 1.
Print 603.93.651
5408

CRANKSHAFT

540810 Measuring main journals and crank
pins
Figure 124
88290
On finding signs of seizure, scoring or excessive ovalization
on main journals and crankpins, it is necessary to regrind the
pins. Before grinding the pins (2), measure the shaft pins with
a micrometer (1) to establish to what diameter it is necessary
to decrease the pins.
NOTE It is advisable to enter the measurements in a table.
See Figure 123.
NOMINAL
VALUE
For undersized crankpins, letter M.
For undersized main journals, letter B.
For undersized crankpins and main journals, letter MB.
F1C ENGINE
NOMINAL
VALUE
NOMINAL
VALUE
The undersize classes are:
0.254 — 0.508 mm.
233
75298
87784
Base - March 2006