Iran Tractor ITM 470, Operators Instruction Book

Page: 78 / 122

4
Maintenance and adjustment
71
To check the clearances proceed as
follows:
1. Turn the crankshaft in the normal di-
rection of rotation until the inlet valve
of number 1 cylinder has just opened
and the exhaust valve of the same cyl-
inder has not closed completely.
2. Check the clearances of valve numbers
4 and 6 and adjust them, if it is neces-
sary.
3. Make a mark on the crankshaft pul-
ley and the timing case and turn the
crankshaft one complete revolution
(3600) until the marks align again.
4. Check and adjust the clearances of
numbers 1, 2, 3 and 5 valves.
5. Replace the rocker cover, using a new
gasket.
FUEL SYSTEM
WARNING
Diesel fuel under pressure can pen-
etrate the skin causing serious injury.
• DO NOT use your hand to check for
leaks. Use a piece of cardboard or
paper to search for leaks.
• Stop the engine and relieve pres -
sure before disconnecting pipes.
• Tighten all connections before
starting the engine.
• If any fluid is injected into the skin
obtain medical attention immedi-
ately.
The utmost care must be taken to keep
fuel clean and to service the fuel system
components at the recommended intervals.
For fuel handling and storage see page
107.
Removing water or impurities
Check the primary fuel filter bowl
and drain off any water or impurities -
flexible maintenance.
Open the tap (1 Fig. 19) on the bottom
of the primary filter to allow water and
other impurities to escape. Close the tap
then actuate the fuel lift pump to refill the
filter.
Primary fuel filter and fuel filter
(Fig. 19)
Change the fuel filter element eve-
ry 500 hours.
1. Turn off the fuel supply .
2. Clean the outside of the filter assem-
bly.
3. Drain the filter by unscrewing the tap
(1).
4. Remove the centre bolt (5).
Fig.19:
1
3
2
4
6
5
5. Remove the element (4) and the bowl
from the head (6) and discard the ele-
ment (4).
6. Reaassemble with new filter element
(4) and a new gasket.
7. Remove air from the fuel system and
check for leaks.