MTZ 1220.1, Operator'S Manual

Page: 214 / 244

MTZ 1220.1/1220.3 K. Scheduled technical maintenance
K34
Operation 44. Check injectors
IMPORTANT! The injectors must be
cleaned and adjusted by a qualified ex-
pert in shop.
Caution! Diesel fuel going out from the
injector under a high pressure can pe-
netrate deeply into the skin tissue of the
hand resulting in serious injuries. Never
use your hand to check injector leaks.
Use paper or cardboard. Wear goggles.
Before disconnecting the fuel lines, stop
the engine to remove the pressure. Be-
fore you start the engine, firmly tighten
connections of the fuel lines. In case of
skin contact with a fuel jet, immediate
seek medical help to avoid blood poi-
soning.
Note: It is convenient to have spare in-
jectors ready for use.
To replace the injectors, proceed as fol-
lows:
• Completely clean the surfaces adjacent
to the removed parts.
• Unscrew the captive nuts (5) and
disconnect the fuel injection pipes (4) from
the injectors (2) and the fuel pump (not
shown).
• Remove the fuel injection pipes (4).
• Remove the bolts (1) and the drain
pipe. Sort out copper washers (two wash-
ers on each banjo bolt).
• Remove the bolts (3) fastening the
injectors and remove the injectors (2).
• Send the injectors to a shop for main-
tenance.
• Install new injectors and removed
parts in the reverse order. Tighten the
bolts (3) fastening the injectors evenly in
2-3 steps. Final tightening torque is 20 to
25 N•m
• Purge the fuel system as specified in
the Operation 37.