Nissan Terrano r20e. Manual — part 169
CAUTION:
I
Do not disassemble No. 1 nozzle (with needle lift sensor).
Entrust disassembly or adjustment to BOSCH service
shop.
Plug flare nut with a cap or rag so that no dust enters the
nozzle. Cover nozzle tip for protection of needle.
Removal and Installation
1. Remove fuel injection tube and spill tube.
2. Remove injection nozzle assembly.
Also remove washers from nozzle end.
3. Install injection nozzle in the reverse order of removal.
Injection nozzle to engine:
: 54 - 64 N
⋅
m (5.5 - 6.5 kg-m, 40 - 47 ft-lb)
Injection nozzle to tube:
: 20 - 25 N
⋅
m (2.0 - 2.5 kg-m, 14 - 18 ft-lb)
a. Always clean the nozzle holes.
b. Always use new injection nozzle gasket.
c. Note that small washer should be installed in specified
direction.
d. Bleed air from fuel system.
Disassembly (No. 2 - 4 nozzle)
1. Loosen nozzle nut while preventing nozzle top from turning.
2. Arrange all disassembled parts in the order shown at left.
SEM621B
NEM244
NEF459
SEF785
MEC996D
INJECTION NOZZLE
TD27Ti
EC-313
Inspection (No. 2 - 4 nozzle)
Thoroughly clean all disassembled parts with fresh kerosene or
solvent.
I
If nozzle needle is damaged or fused, replace nozzle assem-
bly with a new one.
I
If end of nozzle needle is seized or excessively discolored,
replace nozzle assembly.
I
Check nozzle body and distance piece for proper contact. If
excessively worn or damaged, replace nozzle assembly or dis-
tance piece.
I
Check nozzle spring for excessive wear or damage. If exces-
sively worn or damaged, replace it with a new spring.
I
Check distance piece and nozzle holder for proper contact. If
excessively worn or damaged, replace nozzle holder assembly.
Cleaning (No. 2 - 4 nozzle)
a. Do not touch the nozzle mating surface with your fingers.
b. To wash the nozzles, use a wooden stick and brass brush
with clean diesel fuel.
1. Remove any carbon from exterior of nozzle body (except wrap-
ping angle portion) by using Tool.
2. Clean oil sump of nozzle body using Tool.
3. Clean nozzle seat by using Tool.
Take extra precautions when performing this job, since nozzle
efficiency depends greatly on a good nozzle seat.
SEF830
YEC231A
SEF832
INJECTION NOZZLE
TD27Ti
EC-314
4. Clean spray hole of nozzle body by using Tool.
To prevent spray hole from canting, always clean it by start-
ing with inner side and working towards the outside.
5. Decarbonate nozzle needle tip by using Tool.
6. Check needle sink.
(1) Pull needle about halfway out from body and then release it.
(2) Needle should sink into body very smoothly from just its own
weight.
(3) Repeat this test and rotate needle slightly each time.
If needle fails to sink smoothly from any position, replace both
needle and body as a unit.
Assembly (No. 2 - 4 nozzle)
Assembly is in the reverse order of disassembly.
Holder to nozzle nut:
: 29 - 49 N
⋅
m (3.0 - 5.0 kg-m, 22 - 36 ft-lb)
SEF833
SEF834
SEF835
SEF967
INJECTION NOZZLE
TD27Ti
Cleaning (No. 2 - 4 nozzle) (Cont’d)
EC-315
Test and Adjustment
WARNING:
When using nozzle tester, be careful not to allow diesel fuel
sprayed from nozzle to contact your hands or body, and make
sure your eyes are properly protected with goggles.
INJECTION PRESSURE TEST
1. Install nozzle to injection nozzle tester and bleed air from flare
nut.
2. Pump the tester handle slowly (once per second) and watch the
pressure gauge.
3. Read the pressure gauge when the injection pressure just
starts dropping.
Initial injection pressure:
Used
12,259 - 12,749 kPa (122.6 - 127.5 bar,
120 - 130 kg/cm
2
, 1,706 - 1,849 psi)
New
12,749 - 13,730 kPa (127.5 - 137.3 bar,
130 - 140 kg/cm
2
, 1,849 - 1,991 psi)
Always check initial injection pressure using a new nozzle.
4. To adjust injection pressure, change adjusting shims. (No. 2 -
4 nozzle)
a. Increasing the thickness of adjusting shims increases ini-
tial injection pressure. Decreasing thickness reduces ini-
tial pressure.
b. A shim thickness of 0.04 mm (0.0016 in) corresponds
approximately to a difference of 471 kPa (4.71 bar, 4.8
kg/cm
2
, 68 psi) in initial injection pressure.
Refer to SDS for adjusting shim.
EF791A
SEF672A
SEF427F
INJECTION NOZZLE
TD27Ti
EC-316
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