Specifications

MAINTENANCE I 10 I
I, 1 *-‘r!t di.
CLEAN, ADJUST OR RENEW SPARK PLUGS
Refit or renew spark plugs
.i;C’ I
-2, . .
1. Withdraw the H.T. leads from the spark plugs by
2. Using an appropriate plug spanner, remove the
gripping the shrouds, do not pull on the leads.
spark plugs.
ST1087M
11. Check that the washers are fitted to the plugs.
12. It is important that only spark plugs specified in
Data section are used for replacements.
13. Incorrect grades
of plug may lead to piston over -
heating and engine failure.
14. Wash new plugs in petrol to remove the protective
coating, then set the electrode gaps to the
appropriate figures given in ‘Engine Tuning data’.
15. Fit the plugs and washers to the engine but do not
overtighten.
16. Examine high tension leads, including the coil to
distributor lead, for insulation cracking or
corrosion at end contacts. Fit new leads as
necessary.
17. In addition to correct firing order, high tension
leads must be fitted in correct relation to each
other to avoid cross firing, as illustrated. This is
particularly important on the V8 engine.
First illustration. 4
- cylinder engine.
Second illustration.
V8 engine.
shrouds are firmly seated on plugs.
Clean and set gaps
18. When pushing leads on plugs ensure ferrules within
3.
Fit plug in plug cleaning machine.
4. Wobble plug with circular motion while operating
abrasive blast for
a maximum of four seconds.
..
CAUTION: Excessive abrasive blasting will erode
insulator nose.
5. Change to air blast only and continue to wobble
plug for a minimum of thirty seconds to remove
abrasive grit from plug cavity.
6. Wire
- brush plug threads, open gap slightly.
7. Using point file, square off electrode surfaces.
8. Set electrode gap, see ‘Engine Tuning data’,
9. Test plugs in accordance with cleaning machine
manufacturer’s instructions. If satisfactory, refit
plugs in engine.
10. If no machine is available carefully wire brush
electrodes and blow or wash away carbon particles.
Illustration shows:
A. Dirty or unsatisfactory electrode
B. Filing plug electrodes
C. A clean plug correctly set
ST052
A B C
ST051
21