Nanni T4.155 seriers, Руководство по ремонту

Страница: 116 / 191

60300140 (
indice A
) 4 CYLINDERS WORKSHOP MANUAL 116/191
REINSTALLING THE CYLINDER HEAD
1. VERIFY THE PROTRUDING PART OF THE
PISTON AND CHOOSE THE
CORRESPONDING CYLINDER HEAD
GASKET
A. Verify the protruding part of the piston of each
cylinder.
a. Carefully clean the cylinder block assembly surface with a
grease remover.
b. Position the cylinder so as to measure a location just
before top dead center pressure (TDC)
c. .Install a dial gauge on the cylinder head and adjust the dial
gauge to 0 mm.
ADVICE:
* Use the dial gauge with a sensor as shown on the figure
opposite.
* Verify that the sensor is perpendicular to the surface of the
cylinder block gasket and the piston head.
d. Find the position corresponding to the greatest percentage
of piston head protrusion by slowly rotating the crankshaft
in a clockwise direction or in a counter-clockwise direction.
e. The measurement must be made at two different locations
for each cylinder, proceeding as illustrated in the figure
opposite.
f. Using the piston protrusion percentage measurements
made on each cylinder, select the average value of two
measurements for each cylinder.
Protrusion: 0.08 – 0.33 mm
(When a piston-connecting rod assembly is removed)
If the piston head protrusion value is not within the limits recommended
by the specifications, remove the piston-connecting rod assembly and
reinstall it.