This range of 1.6 BMW 4 cylinder twin camshaft 16v. petrol
engines have VANOS (VCT) units on inlet and exhaust
camshafts but are not Valvetronic engines.
The N40 was introduced in the BMW 3 Series (E46) in 2001,
followed by the N45 in the 1 Series (2003). The N45T appears in
both the 1 Series and 3 Series from 2006.
VS4870 Setting/Locking Tool Kit
Comprises: VS4801 Flywheel Locking Pin
VS4803 Chain Tensioner Pre-Load Tool
VS4868 Camshaft Setting Plate Assembly
Comprises: VS4868-1 (Inlet Plate)
VS4868-2 (Exhaust Plate)
VS4805-3 (Securing Screw)
VS4869 VANOS Alignment Plate
For checking and adjusting valve timing, the timing positions for
the camshafts are achieved using the VS4868 Camshaft Setting
Plate Assembly and the VS4803 Timing Chain Tensioner Pre-
Load Tool.
The crankshaft is locked at TDC (via the flywheel) using VS4801
Locking Pin.
The VANOS units positions are adjusted with VS4869 Alignment
Plate.
3.1
Checking valve timing
3.1.1 remove the cylinder head cover and all spark plugs.
unscrew the bolt retaining the oil supply line and unclip the line.
Turn the crankshaft, in normal direction of engine rotation, to
TDC No.1 cylinder (ignition), using a wrench on the crankshaft
pulley centre bolt.
3.1.2 Check the timing positions of the camshafts – each camshaft
has a rectangular section at the rear which has a curved edge
on top and a straight edge on the bottom. With the engine in the
correct TDC engine timing position, the
curved edge
of the
rectangles, on both camshafts, will be
uppermost
(fig.2).
An additional guide to correct camshaft position, using the
exhaust camshaft, is that in the correct TDC engine timing
position, the recesses in the sections of the exhaust camshaft
between the lobes, will be pointing towards the exhaust
manifold (fig.3).
3.2
VS4801 Flywheel TDC Locking Pin
3.2.1 Insert VS4801 Flywheel TDC Locking Pin through the datum
hole, which is located underneath the starter motor, and into the
timing hole in the flywheel (fig.4).
NOTE:
The datum hole can be difficult to locate and may be
constricted by dirt/corrosion.
IMPORTANT:
On Automatic Transmissions – there is a much
larger hole in the flywheel very near to the timing hole and
checks are required to ensure that this hole has not been
selected in error. With VS4801 Locking Pin inserted, check that
the engine will not rotate back and forth. use a wrench on the
crankshaft pulley bolt to rotate the engine.
VANOS Units:
IMPORTANT:
If the VANOS unit has ‘locked’ correctly, the
camshaft will not turn. If the VANOS units cannot be locked to
the camshafts, it is likely they are faulty, and must be replaced –
refer to removing and Installing VANOS units.
3.3
VS4868 Camshaft Setting Plate Assembly
(comprises VS4868-1, VS4868-2 & VS4805-3)
3. INSTRUCTIONS
fig.1
fig.3
fig.4
fig.2
fig.5
3.3.1 Place VS4868-1 Camshaft
Setting Plate on to the
rectangular section at the rear of
the INLET camshaft, and ensure
the Plate
rests fully
on the
surface of the cylinder head.
(Do not insert fixing bolts)
If timing is correct, VS4868-1
Plate should rest on the cylinder
head without any gap, or at most,
raised 0.5mm. to the exhaust
side only (fig.5).
VS4870
Issue No: 1 - 07/04/09
