19.0
service
00497R0990 - 15-07-2000
36
35
33
34
10.5 Injection pump assembly (fig. 37)
If the injection pump must be demounted, use an electric pen
to mark the adjuster block (M) with the enbloc pump casing (A)
and loosen the plug (N) after having heated it to make the
Loctite easier to release.
Comply with the following instructions when remounting the
parts:
1) Fit the washer (B), the delivery valve (C), the washer (D),
the valve spring (E), the filler (F) into the enbloc pump
casing (A) and torque the delivery union (G) to a value of:
10.3 Checking the injection pump
before demounting the injection pump, make sure that the
plunger unit, enbloc pump casing and valve are pressure tight
by proceeding in the following way:
1) Connect a pressure gauge with scale up to 600 Kg/cm²
600 Kg/cm²
600 Kg/cm²
600 Kg/cm²
600 Kg/cm² to
the fuel delivery pipe (fig. 33).
2) Set the regulating sleeve (fig. 34) to the average delivery
position.
3) Slowly turn the flywheel to make the plunger make one
compression stroke.
4) Read the indication on the pressure gauge. If it is lower
than 300 Kg/cm²
300 Kg/cm²
300 Kg/cm²
300 Kg/cm²
300 Kg/cm², the complete pump must be changed.
During the test, the pressure gauge needle will show a
progressive pressure increase until reaching a maximum
value, after which it will drop sharply back and stop at a lower
pressure value. Replace the valve if the pressure drop is more
that 50 Kg/cm²
50 Kg/cm²
50 Kg/cm²
50 Kg/cm²
50 Kg/cm² and continues to slowly drop lower.
The pressure must drop from 200 Kg/cm²
200 Kg/cm²
200 Kg/cm²
200 Kg/cm²
200 Kg/cm² to 150 Kg/cm²
150 Kg/cm²
150 Kg/cm²
150 Kg/cm²
150 Kg/cm² in
not less than 7 sec.
7 sec.
7 sec.
7 sec.
7 sec.
10.4 Injection pump calibration (fig. 35)
When the adjuster sleeve is 10.5 mm
10.5 mm
10.5 mm
10.5 mm
10.5 mm from the stop position
and the pump spins at 1,500 rpm
1,500 rpm
1,500 rpm
1,500 rpm
1,500 rpm, the amount of fuel for 1,000
1,000
1,000
1,000
1,000
deliveries must be between:
WARNING:
Check to make sure that plunger travel with the injection cams
in the non-operative position (BDC) at the start of delivery is:
1.9 to 2.0 mm
1.9 to 2.0 mm
1.9 to 2.0 mm
1.9 to 2.0 mm
1.9 to 2.0 mm
23
23
23
23
23
to
to
to
to
to
25 cc
25 cc
25 cc
25 cc
25 cc
Replace the pump if the values differ.
2) Insert the adjuster seal (H).
3) Insert the flange (I).
4) Insert the plunger with helical profile (A, fig. 36) into the iner
housing of the adjuster sleeve from the side opposite the
sleeve pin (B, fig. 36).
4.3 to 5.4 Kgm (42.5 to 52.5 Nm)
4.3 to 5.4 Kgm (42.5 to 52.5 Nm)
4.3 to 5.4 Kgm (42.5 to 52.5 Nm)
4.3 to 5.4 Kgm (42.5 to 52.5 Nm)
4.3 to 5.4 Kgm (42.5 to 52.5 Nm)
A
A
A
A
A
B
B
B
B
B
