gjpjgjjl 'READING' YOUR SPARK PLUGS
Champion explain how the condition of spark plug firing ends can act as a guide to the state of tune and general condition of the engine. The examples shown are assumed to be the correct grade for the engine.
NORMAL
Core nose lightly coated with grey-brown deposits. Electrodes not burning unduly
-
gap increasing by about 0.01 mm every 1,000 miles approximately (with the use of unleaded fuel). Spark plugs correct for engine.
OIL FOULING
Deposits can short-circuit firing end, weakening or eliminating spark. Causes: worn valve guides, bores or piston rings, or while new engine is running-in. Replace spark plugs. Cure oiling problem.
SPLIT CORE NOSE
(May first appear as hair-line-crack). Probably caused by: Over-advanced ignition timing. Faulty distributor advance mechanism. Use of low octane fuel. Weak mixture. Manifold air-leaks. Cooling system problems. Incorrect gap-setting technique.
HEAVY DEPOSITS
Possible causes: Fuel or oil additives. Excessive upper cylinder lubricant. Worn valve guides. Unvarying speed (stationary engine). Replace spark plugs.
OVERHEATING
Likely causes are: Over-advanced ignition timing, or faulty distributor advance mechanism. Use of low octane fuel. Weak mixture. Discard spark plugs showing signs of overheating, and cure the cause.
CARBON FOULING
Look for dull black sooty deposits. (Unleaded fuel carbon fouling can appear similar to oil fouling). Deposits can short circuit the firing end, weakening or eliminating the spark. Check for: Over-rich mixture, faulty choke or clogged air filter. Replace spark plugs.
INITIAL PRE-IGNITION
Caused by serious overheating. Causes are those listed for overheating, but may be more severe. Corrective measures are urgently needed before engine damage occurs. Discard plugs in this condition.
FACT FILE: CORRECT INSTALLATION
• Make sure seating areas are perfectly clean.
• Insert plug finger tight to seat. Ensure plug 'spins' freely.
• PLUGS WITH SEATING GASKET: Tighten to relevant torque setting.
• PLUGS WITH TAPER SEATS: Tighten a further l/16th turn ONLY - no further!
• Overtightening can damage cylinder head or make taper seat plugs impossible to remove.
RECOMMENDED FL LUBRICANTS
FOR YOUR FIAT TIPO ARID TEMPRA
COMPONENT/ TIPO & TEMPRA TIPO SELECTA & TEMPRA SELECTA TIPO & TEMPRA DIESEL CAPACITY 1.4 and 1.6 1.6 and 1.6 i.e. 1.7 D, 1.9 Dand 1.9 TD
ENGINE SELENIA 20K SELENIA 20K SELENIA TURBO DIESEL CAPACITY 3.8 L 3.8 L/4.2 L 5.0 L
MANUAL TRANSMISSION TUTELA ZC80/S -TUTELA ZC80/S CAPACITY 2.0 L -2.0 L
AUTOMATIC TRANSMISSION -TUTELA CVT -CAPACITY -3.5 L (a) -
DIFFERENTIAL(S) FROM GEARBOX FROM GEARBOX FROM GEARBOX CAPACITY ---
STEERING BOX TUTELA K854 TUTELA K854 TUTELA K854 CAPACITY 80 g (b) 80 g (b) 80 g (b)
CONSTANT VELOCITY JOINTS TUTELA MRM2 TUTELA MRM2 TUTELA MRM2 CAPACITY 95 g (each) 95 g (each) 95 g (each)
BRAKE FLUID RESERVOIR TUTELA PLUS 3 TUTELA PLUS 3 TUTELA PLUS 3 CAPACITY (NON-ABS) 0.40
L
(c) 0.40 L (c) 0.40
L
(c)
COOLANT PARAFLU 11 PARAFLU 11 PARAFLU 11 CAPACITY 6.5 L(d) 6.5 L(d) 8.8
L
(d)
WINDSCREEN WASHER TANK AREXONS DP1 AREXONS DP1 AREXONS DP1 CAPACITY 5.0 L 5.0 L 5.0 L
NOTES: (a) DRAIN/REFILL CAPACITY (b) IF MODEL FITTED WITH POWER ASSISTED STEERING USE 0.75 L TUTELA Gl/A (c) IF ABS BRAKING IS FITTED USE 0.52 L TUTELA TOP 4 (d) COOLING SYSTEM AT A CONCENTRATION OF 50% COOLANT TO 50% WATER
CHANGE PERIODS: See Chapter 5, Service Intervals
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