Timing - New Holland FX25 Repair Manual

6

TIMING

If you have doubts about the exact timing you can
verify the relationship between the start of the injec-
tion and the plunger position.
1. Remove the inspection cap 19 (Fig. 9) corre-
sponding to plunger N° 1 from the pump.
2. Ensure plunger N° 1 is in the initial delivery posi-
tion (IDP), i.e. lower position.
3. Use special tool 12 (Ref. IVECO 99365183), in-
cluding gauge 13. Place the tool's stem on top of
the pump tappet.
4. Pre--charge the gauge by 2 to 3 mm.
5. Turn the flywheel to find the lowest position of
plunger N° 1.
6. Reset the gauge to zero.
7. Turn the flywheel by approximately half a turn in
the opposite direction to normal rotation.
8. Now turn the flywheel the other way and check
when the injection advance mark on the flywheel
coincides with the window indicator, the plunger
stroke should be:
Engine hp Timing
degree
300 hp 19°
375 hp 8°
450 hp 8°
9. If you obtain a different measurement:
-- Loosen bolts 15 (Fig. 10).
-- Change the position of cam 16 (Fig. 10) in
order to obtain the correct pre--stroke (375
and 450 hp only).
-- On the 300 hp engine rotate plate 17
(Fig. 11).
-- Check the stroke again and tighten nuts 15 to
100 Nm.
If a gauge is not available, the pump can be correctly
timed by means of the overflow DROP SYSTEM.
SECTION 10 - - ENGINE - - CHAPTER 1
Piston travel
mm
3.35 -- 3.55
5.00 -- 5.10
5.00 -- 5.10
55154
55157
55156
9
10
11