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9 Remove the crankshaft oil pump drivegear
and its Woodruff key.
10 Unbolt the oil pump. Some
socket-headed screws are accessible through
the holes in the driven gear (see illustration).
Lift off the pump and spacer plate (see
illustration).
11 Jam the camshaft sprocket and unscrew
the sprocket retaining bolt. Take off the fuel
pump operating eccentric.
12 Turn the lock on the chain tensioner
anti-clockwise to lock it in its retracted state
(see illustration).
13 Remove the camshaft sprocket with
timing chain.
14 Thoroughly clean all the removed
components ensuring that all traces of old
gasket are removed from the timing cover,
rocker cover and engine mating faces.
15 Examine the teeth of both sprockets for
wear. Each tooth on a sprocket is an inverted
V-shape and wear is apparent when one side
of the tooth becomes more concave in shape
than the other. When badly worn, the teeth
become hoop-shaped and the sprockets
must be renewed. The crankshaft sprocket
and oil pump drive gear are removed by
sliding them off the crankshaft with their
Woodruff keys.
16 If the sprockets need to be renewed then
the chain will have worn also and should also
be renewed. If the sprockets are satisfactory,
examine the chain and look for play between
the links. When the chain is held out
horizontally, it should not bend appreciably.
Remember, a chain is only as strong as its
weakest link and, being a relatively cheap
item, it is worthwhile fitting a replacement
anyway.
17 Check the condition of the tensioner
slipper. If it is worn, renew it; it is held in
position by two bolts. If the tensioner is
removed, note the fine mesh filter screen
located behind the tensioner body. Ensure
that it is clean and in place when refitting the
tensioner.
18 Inspect the oil pump drive gears for wear
or damage and renew if necessary. Always fit
a new timing cover oil seal (see Section 8).
Refitting
19 Check that the crankshaft is positioned
correctly by observing the crankshaft
sprocket keyway which should be in
alignment with the crankcase joint (see
illustration 4.8). Turn the crankshaft if
necessary to bring it to the correct position.
Temporarily fit the camshaft sprocket and
rotate the camshaft until the keyway is also
positioned as shown.
20 Engage the chain around the crankshaft
sprocket so that the timing mark on the
sprocket is in the centre of the single bright
link on the chain (see illustration).
21 Now engage the upper loop of the chain
over the camshaft sprocket so that the timing
mark is between the two bright links on the
chain (see illustration).
22 Now offer the camshaft sprocket to the
shaft. Adjust the position of the camshaft so
that the sprocket keyway aligns with the key.
23 Push the camshaft sprocket into position.
Insert and tighten its retaining bolt with the
fuel pump eccentric correctly located (see
illustration).
2A•4 XV, XW and XY series engine in-car repair procedures
4.12 Timing chain tensioner lock (2)
Turn in direction of arrow to release slipper -
turn in opposite direction to retract slipper
4.10b Removing the oil pump and spacer
plate
4.10a Removing oil pump screw with Allen
key
4.20 Timing chain bright link (arrowed) positioned over crankshaft
sprocket timing mark
4.21 Camshaft sprocket timing mark positioned between two
bright links (arrowed) on chain