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FOCS Workshop Manual_cod. 1.5302.351_7° ed_ rev. 06
8
184
185
186
187
Static injection advance tuning
If the injection advance value found does not correspond to the
previously described value, adjust the screw E and repeat the test.
Rotating screw E by ½ turn will change the injection advance by 5°.
If turned clockwise, injection is advanced.
In the opposite direction, injection is delayed.
Tester and special coupling for injection advance control (Old-
type injection pump)
1 Special coupling. Serial number: 7107-1460-028
2 Injection advance tester. Serial number: 7271-1460-024.
Remove the cap on the pump/injector casing and in its place screw
on coupling 1.
On this coupling tighten the tester 2.
Note: When reassembling the cap on the pump/injector unit, check
its seal.
TDC (Top Dead Center) references
D coincides with A =TDC of 1
st
cylinder of all series engines, of 4
th
cylinder LDW 1204-1204/T-1404, and of 2
nd
cylinder LDW 502.
E coincides with A =TDC of the 2
nd
cylinder LDW 903-1003.
F coincides with A =TDC of 2nd cylinder LDW 602-702., of 3
rd
and 2
nd
cylinder LDW 1204-1204/T-1404.
G coincides with A =TDC of 3
rd
cylinder LDW 903-1003.
Note: Following the arrow’s rotation direction, the combustion
order for LDW 903-1003 is D, G, E (1
st
- 3
rd
- 2
nd
cylinder
respectively. As to LDW 1204-1204/T-1404 the sequence is
D, F, D, F (1
st
– 3
rd
– 4
th
and 2
nd
cylinder).
Injection advance references on timing belt protector
The method of checking injection advance is essentially the same as
that described in fig. 182 with one difference: instead of using the
device se.no. 7107-1460-048 with which you measure piston
lowering with respect to the Top Dead Centre, you use references A
and C on the timing belt protector and reference D located on engine
pulley.
When D coincides with A the piston has reached its TDC.
When D coincides with C the piston is in injection advance position.
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