11 31.. Checking/reworking intake camshaft (N20, N26)

Necessary preliminary tasks:

IMPORTANT: Work may only be carried out on the appropriate intake camshaft variant.
Determined INTAKE CAMSHAFT VARIANT .

Repair kit components:

A Test sleeve with test pin
B Pre-tensioning sleeve with spring sheet tube (1)
C Press-in stamp

Fig 1: Identifying Test Sleeve, Pre-tensioning Sleeve And Press-In Stamp
Courtesy of BMW OF NORTH AMERICA, INC.

Checking position of end cover in intake camshaft:

NOTE: For clarification, the following operations show the intake camshaft removed.

Insert test sleeve (A) in drive flange for vacuum pump of intake camshaft (1) and move into position.

Slide in test pin (2) in direction of arrow up to stop.

Determine position of test pin (2).

Fig 2: Sliding Test Pin

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Clear protrusion of test pin (1) in relation to test sleeve (A):

(End cover already moved. Installation depth not sufficient.)

Remove test sleeve with test pin.

Replace intake camshaft.

IMPORTANT: Replace INTAKE CAMSHAFT in accordance with altered procedure.

Fig 3: Locating Protrusion Of Test Pin (Clear)

Courtesy of BMW OF NORTH AMERICA, INC.

Slight protrusion of test pin (1) in relation to test sleeve (A):

(End cover already moved. Installation depth not sufficient.)

Remove test sleeve with test pin.

Replace intake camshaft.

IMPORTANT: Replace INTAKE CAMSHAFT in accordance with altered procedure.

Fig 4: Locating Protrusion Of Test Pin (Slight)

Courtesy of BMW OF NORTH AMERICA, INC.

No protrusion or slight negative protrusion of test pin (1) in relation to test sleeve (A):

(End cover not moved. Installation depth sufficient.)

Remove test sleeve with test pin.

Retrofit spring sheet tube.

Fig 5: Locating No Protrusion Of Test Pin

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Retrofitting spring sheet tube:

IMPORTANT: The bore holes in the spring sheet tube (1) must be in the forward push-in direction.

Insert pre-tensioning sleeve (B) with spring sheet tube (1) as shown in intake camshaft (2) and bring into position.

Fig 6: Identifying Spring Sheet Tube And Intake Camshaft

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IMPORTANT: Bring press-in stamp (C) into position.

Press spring sheet tube (1) in direction of arrow with press-in stamp (C) into pre-tensioning sleeve (B) until spring sheet tube is virtually flush.

Fig 7: Pressing Spring Sheet Tube With Press-In Stamp Into Pre-tensioning Sleeve

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IMPORTANT: In the next step the spring sheet tube (1) must engage in intake camshaft (2).

This prevents the end cover (3) from moving.

Fig 8: Engaging Spring Sheet Tube In Intake Camshaft

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Pre-tensioning sleeve (B) and press-in stamp (C) must be moved into position so that spring sheet tube locks in intake camshaft.

Turn press-in stamp over. Insert tip of press-in stamp into spring sheet tube (1).

Press spring sheet tube (1) in direction of arrow fully into camshaft until press-in stamp (C) and pre-tensioning sleeve (B) are in contact.

Fig 9: Removing Pre-tensioning Sleeve And Press-In Stamp Together

Courtesy of BMW OF NORTH AMERICA, INC.

Remove pre-tensioning sleeve (B) and press-in stamp (C) together.

Required follow-up work:

Install VACUUM PUMP