Specifications

4M41 ENGINE -
Injection Nozzle
11B-15-2
Caution
1. Fuel is highly flammable. Keep it away from flames and sources of heat.
2. Wipe up spilt fuel completely. It could catch fire.
3. Remove all deposited carbon from the injection nozzle assembly 10 before disassembling,
reassembling and adjusting it. Prior to intended disassembly, check the injection nozzle 10
for abnormal injection pressure, abnormal spray pattern and fuel leaks. If it is in order, the
disassembly is not needed.
4. Never change the original combination of needle valve 13 and nozzle tip 12 when reassembling
each injection nozzle assembly 10.
5. Dust particles can seriously affect the engine performance. To prevent the ingress of dust,
fully cover and close up the opening left after removal of each injection nozzle assembly 10.
PRE-REMOVAL INSPECTION
Install the nozzle tester
A
to the injection nozzle assembly
10
and perform th e following checks:
Caution
Prior to proceeding with the check s, bleed air from the
fuel injection nozzle by pumping the nozzle tester lever
two or three times.
1. VALVE OPENING PRESSURE CHECK
(1) Operate the nozzle tester
A
lever at 1 to 2 seconds per
stroke. Read the pressure when, after a gradual increase,
the pointer deflects rapidly.
(2) If the reading deviates from the specified standard value,
disassemble the fuel injection nozzle, clean and
reassemble. Then, make necessary pressure adjustment
using adjusting shims
18, 24
.
(3) If the reading still deviates after t h e adjustment, replace
the fuel injection nozzle assembly
10
.
2. SPRAY PATTERN CHECK
(1) Inject fuel continuously by pumping the nozzle tester
A
lever quickly (1 to 2 seconds per stroke).
B
: Even spray from all five injection orifices (Good)
C
: Even and symmetrical spray (Good)
D
: Asymmetrical spray (Bad)
E
: Branched spray (Bad)
F
: Thin spray (Bad)
G
: Irregular spray (Bad)
(2) Disassemble, clean and recheck the fuel injection nozzle
assembly
10
if necessary. If th e problem still remains
after another check, replace the fuel injection nozzle
assembly.
(3) Check that the fuel injection nozzle does not dribble after
injection.
Caution
Do not touch the spray that comes out of the nozzle.
PWEE9409-D
E
Feb. 2000Mitsubishi Motors Corporation Added
A
10
C
ED
F
G
B