Maintenance
0330−1/A1
Winterthur Gas & Diesel Ltd.
25/ 25
Fuel Pump
Group
Key No.
Description Measuring
Direction
(method of
measuring)
Nominal
Dimension
(usual, new)
[mm]
Maximum Clearance,
Dimension
(because of wear)
[mm]
5556 Fuel pump
Plunger (∅ 42, 44 and 46 mm)
1 Clearance (plunger / cylinder) A−B radial 0.035−0.038 0.045
Clearance (plunger / cylinder) B−C radial 0.025−0.028 0.035
* Clearance (plunger / cylinder) D radial 0.040−0.043 0.5
Guide piston outer ∅ 185
Lower housing inner ∅ 185
2 Clearance radial 0.15−0.68 0.8
3 Piston / lower spring carrier axial 0.12−0.24 0.3
4 Regulating sleeve / upper spring
carrier
axial 0 .5−0.7
0.8
5556 Roller guide
Pin outer ∅
80
0
− 0.013
Guide piston (bore) inner ∅
80
+ 0.04
+ 0.01
5 Clearance radial 0.010−0.053 0.08
6 Total clearance between guide piston
and roller with pressure discs
axial 0.26−0.54
0.7
* Plunger conically machined in range ’C’−’D’; i.e. clearance increases in
diameter of 0.015 mm.
Clearance Table
2015
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