13 53 310 Removing and installing or replacing one fuel injector in fuel injection system (N14)

WARNING: This page is about a different variant/trim than selected.

Notes

WARNING: Disconnect BATTERY NEGATIVE LEAD (risk of fire due to short circuit on dismantling).

Carry out installation work on fuel system only with coolant temperature below 40°C.

Only perform these tasks on an engine that has cooled down. Risk of scalding.

IMPORTANT: Wear full face guard and protective gloves.

Fuel can emerge spontaneously at high velocity when the high-pressure line is released!

IMPORTANT: Adhere to conditions of absolute cleanliness when working on the high-pressure fuel system.

Introduced contaminants can cause malfunctions in the system!

Do not allow any dirt particles or foreign bodies to get into the system.
Remove all traces of dirt before removing pipes or individual components.
Use only fluff-free cloths.
Seal all fuel system openings with protective caps or plugs.

Necessary preliminary tasks:

Remove HIGH-PRESSURE RAIL

Recycling

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel.

Observe country-specific waste-disposal regulations.

Removal

Remove retainer (1) and discard.

Pull up fuel injector (2) to remove.

Fig 1: Identifying Retainer And Fuel Injector

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Procedure in event of stuck injectors

NOTE: The following procedure applies to all injectors.

For purposes of clarity, illustration shows and description refers to the removed engine.

13 0 231 Mount special tool with lettering "Top" facing upwards.

Fig 2: Identifying Top (Letter) On Special Tool (13 0 231)

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Mount special tool 13 0 232.

To secure injector, turn nut (1) by hand until noticeable resistance is felt.

Fig 3: Identifying Special Tool (13 0 2320 With Nut

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13 0 232 Turn nut on special tool several turns until injector has been released from hole.

Remove special tool.

Remove injector.

Fig 4: Turning Nut On Special Tool (13 0 232)

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The fuel injector installation procedure is described separately.

IMPORTANT: When replacing the injectors, adherence to the following information is mandatory!

T13To find the correct new part, the 13-digit cylinder head number must be known.

The number can be found on the cylinder head.

Read and write down the cylinder head number.

There are two designs of the injectors and fastener.

To ensure the correct installation of the injectors/fastening components, the cylinder head number is important!

From MCGU10xxxxxxx:

Cylinder head with injector without Stop Choc.

From MCGU15xxxxxxx:

Cylinder head with injector with Stop Choc.

Fig 5: Identifying Cylinder Head Numbers For Installing Injector

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Injector differences:

For injectors (1) of the first generation the connecting tube is rounded. The first part of the encapsulation is made of plastic.
Injector (1) has a compensation element without Stop Choc.
Injector (2) of the second generation the connection tube is slightly thicker and not rounded. The first part of the encapsulation is made of metal.

Injector (2) has a decoupling element with Stop Choc.

Fig 6: Identifying Injectors Of First And Second Generations

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Differences between the compensation elements and decoupling elements:

1) Compensation elements with retaining ring are without Stop Choc
2) Decoupling elements without retaining ring are with Stop Choc

Decoupling elements must be replaced after each disassembly!

Fig 7: Identifying Compensation Elements And Decoupling Elements

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Procedure for cylinder head number

starting with MCGU10xxxxxxx

Only injectors (1) of the first generation must be installed with compensation elements (2) without Stop Choc and retaining rings!

Injectors of the second generation with Stop Choc decoupling elements must not be installed!

Fig 8: Identifying Injectors With Compensation Element

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Procedure for cylinder head number starting from MCGU15xxxxxxx

IMPORTANT: When replacing cylinder heads (MCGU10xxxxxxx) with cylinder head (MCGU15xxxxxxx) , injectors of the first generation may be used again. To do this, they must be modified to Stop Choc decoupling elements!

Fig 9: Identifying Injectors With Compensation Element And Retainer Ring

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Both injector designs may be installed into cylinder heads starting with MCGU15xxxxxxx . To do this, the injectors must be modified to Stop Choc decoupling elements (1).

Injectors (1) of the first generation may only be installed into cylinder heads starting with MCGU15xxxxxxx , if they were modified to Stop Choc decoupling elements!

Remove retaining ring (2) from injector (1) and pull off compensation element (3) without Stop Choc.

Install new Stop Choc decoupling element (2) onto injector (1) until a clicking noise is audible.

Fig 10: Identifying Stop Choc Decoupling Element Onto Injector

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Injectors (1) of the second generation must only be installed with Stop Choc decoupling elements (2).

When reusing or replacing the injector, Stop Choc decoupling elements must be replaced.

Fig 11: Identifying Injectors With Stop Choc Compensation Element

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Installation

Installation:

Make sure guide pin (3) of fuel injector (2) is correctly positioned in designated hole (4) in cylinder head
Replace seal (6) and support ring (5), making sure support ring (5) is seated correctly
Replace retainer (1)
Replace Teflon seal

Fig 12: Identifying Retainer, Fuel Injector, Guide Pin, Support Ring And Seal

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Replacing Teflon sealing ring

NOTE: N53Depiction of engine, procedure N14 for engine identical.

Before replacing Teflon sealing ring (1), make sure hands and work surface are clean and free of oil.

Avoid mechanical contact with injector tip (2).

Fig 13: Identifying Injector Tip With Sealing Ring

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Remove Teflon sealing (1) from injector (2) with special tool 13 0 191.

Use a fluff-free cloth only to remove combustion residues from cylindrical part of injector tip (do not use ultrasound or other tools/agents).

Do not clean injector tip (2).

Fig 14: Removing Sealing Ring From Injector Using Special Tool (13 0 191)

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NOTE: N53Depiction of engine, procedure N14 for engine identical.

Slide new Teflon seal (1) 13 0 195 onto mounting taper.

Fig 15: Identifying Sealing Ring Onto Mounting Taper

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NOTE: N53 Depiction of engine, procedure N14 for engine identical.

User fingers and mounting taper 13 0 195 to slide Teflon sealing ring (1) onto injector (2).

NOTE:

Do not use fingernails to slide on Teflon seal.
Do not use any lubricants.
The seal is expanded when slid on.

Fig 16: Sliding Sealing Ring Onto Injector Using Finger And Mounting Taper (13 0 195)

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NOTE: N53Depiction of engine, procedure N14 for engine identical.

To bring the expanded Teflon sealing ring to its installation dimension, slide three mounting sleeves with decreasing diameters onto the injector.

Slide mounting sleeve (1) with large opening first onto injector (2).

Do not use any lubricating agents.

Fig 17: Sliding Mounting Sleeve Onto Injector

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NOTE: N53Depiction of engine, procedure N14 for engine identical.

First slide assembly sleeve 13 0 192 (large diameter) onto injector (1).

Then slide assembly sleeve 13 0 193 (medium diameter) onto injector (1).

Fig 18: Sliding Mounting Sleeves (13 0 192 And 13 0 193) Onto Injector

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NOTE: N53 Depiction of engine, procedure N14 for engine identical.

Finally, press injector (1) into assembly sleeve 13 0 194 (small diameter).

Fig 19: Identifying Injector With Assembly Sleeve (13 0 194)

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Assemble engine.

CHECK FUEL SYSTEM FOR LEAKS .

Check function of DME.