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3 Compression test -
description and interpretation
Refer to Part A, Section 3 but on engines
with a static distributorless ignition system,
disable the ignition by depressing the
retaining clip and disconnecting the wiring
connector from the ignition module.
4 Timing belt - general
information, removal and
refitting
3
General information
1 The timing belt drives the camshaft and
coolant pump from a toothed sprocket on the
front of the crankshaft. If the belt breaks or
slips in service, the pistons are likely to hit the
valve heads, resulting in extensive (and
expensive) damage.
2 The timing belt should be renewed at the
specified intervals (see Chapter 1), or earlier if
it is contaminated with oil, or if it is at all noisy
in operation (a “scraping” noise due to uneven
wear).
3 If the timing belt is being removed, it is a
wise precaution to check the condition of the
coolant pump at the same time (check for
signs of coolant leakage). This may avoid the
need to remove the timing belt again at a later
stage, should the coolant pump fail.
Removal
4 Disconnect the battery negative lead.
5 Remove the auxiliary drivebelt as described
in Chapter 1.
6 Remove the inner shield from the
right-hand wheel arch and wedge the radiator
bottom hose under the sump.
7 Remove the shield from the camshaft
sprocket.
8 Remove the plastic covers from the front of
the timing belt. Note the location of the
various bolts.
9 Observe the timing belt tensioner assembly
and ascertain whether it is of the spring-
loaded type or the later eccentric roller type
(see illustration). Proceed as follows under
the appropriate sub-heading according to
type fitted.
Models with spring-loaded tensioner
10 Turn the crankshaft using a spanner on
the pulley bolt until the dowel hole in the
pulley is at about 12 o’clock and the hole in
the camshaft sprocket is at about 7 o’clock. In
this position a 10 mm dowel should pass
through each hole and into the timing recess
behind. Verify this and then remove the
dowels (see illustration).
11 Remove the clutch bottom shield. Have
an assistant jam the starter ring gear while the
crankshaft pulley bolt is undone. This bolt is
very tight. Do not jam the pulley by means of
the timing dowel: damage will result. Remove
the bolt and washer.
12 Check that the 10 mm dowels will still
enter the timing holes: adjust the crankshaft
position if necessary by means of the starter
ring gear. Remove the crankshaft pulley,
retrieving the Woodruff key if it is loose.
2B•4 XU series engine in-car repair procedures
4.10 Crankshaft and camshaft sprockets
locked with timing dowels
4.9 Spring loaded timing belt tensioner (earlier assembly) and eccentric roller type tensioner (later assembly)
1 Right-hand engine mounting 2 Timing belt 3 Tensioner roller 4 Tensioner roller nut