Preparatory steps
1. Close fuel supply line.
2. Remove fuel return line .
Replacing HP fuel line and pres-
sure pipe neck
1. Remove union nuts (1, 3) on HP fuel line (2).
2. Remove HP fuel line (2).
3. Remove union nut (4).
4. Pull out pressure pipe neck (5).
5. Coat sealing ring of new pressure pipe
neck (5) with assembly compound.
6. Coat cone of pressure pipe neck (5) with en-
gine oil.
7. Insert pressure pipe neck (5) into cylinder
head until it has contact with the sealing ring
in the cylinder head.
8. Fully press in pressure pipe neck (5) by hand.
9. Insert union nut (4).
10. Tighten union nut (4) to specified torque using a torque wrench.
Name Size Type Lubricant Value/Standard
Union nut M24 Preload torque (Engine oil) 15 Nm +5 Nm
Union nut M24 Tightening torque 50 Nm +5 Nm
11. Coat mating face with engine oil between union nut (1, 3) and HP fuel line (2), end of line and thread on both
sides of the new HP fuel line (2).
12. Install new HP fuel line (2).
13. Tighten union nut (1) of HP fuel line (2) on rail to specified torque using a torque wrench.
a) In case of single-wall HP fuel system
Name Size Type Lubricant Value/Standard
Union nut M20 Tightening torque (Engine oil) 37 Nm +3 Nm
b) In case of double-wall (jacketed) HP fuel system
Name Size Type Lubricant Value/Standard
Union nut M20 Tightening torque (Engine oil) 50 Nm +5 Nm
14. Tighten union nut (3) of HP fuel line (2) on pressure pipe neck to specified torque using a torque wrench.
Name Size Type Lubricant Value/Standard
Union nut M16 Tightening torque (Engine oil) 37 Nm +3 Nm
134 | Fuel System | MS15054/03E 2018-07
TIM-ID: 0000050910 - 007
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