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Are Your Plugs Trying To Tell You Something?

CHAMPION

Glow Plugs for Diesel engines.

Possible causes

Q Melted or broken sheath

• Injectors (incorrect injection pressure, overadvanced injection, dripping nozzles). •Oil in the combustion chamber (overheating due to too high an oil level)

•Worn valve guides, broken piston rings

0 Corroded Sheath

•    Electronic Control Relay Failure

•    Incorrect system voltage

•Incorrect pług type fitted

•    Thermal exchange regulation chamber compressed due to excessive torque on tightening of pług. A narrowed thermal exchange regulating chamber causes the sheath to overheat.

Corrective Action

•    Recalibration of injection system •Correct engine oil level

•    Replacement of piston rings/reboring of valve guides

•    Check and/or replace Electronic Control Relay

•    Check electrical system

•    Check the pług type is correct for the vehicle

•    The pług has to be mounted with care using a torque wrench, paying particular attention to the recommended torque levels

Q| Open circuit with apparently undamaged sheath

•    Defective electrical system causing    • Check electrical system

excessive voltage from battery

•    Electronic Control Relay failure    • Check and/or replace Electronic Control Relay

Spark Plugs for petrol engines.

Normal - Grey-brown deposits, lightly coated core nose. Plugs ideally suited to engine, and engine in good condition.

Oil Fouling - Wet, oily deposits. Fault: worn bores/piston rings or valve guides: sometimes occurs (temporarily) during running-in period.

Heavy Deposits - A build up of crusty deposits, light-grey sandy colour in appearance.

Fault: often caused by worn valve guides, excessive use of upper cylinder lubricant, or idling for long periods.

Overheating - Electrodes have glazed appearance, core nose very white - few deposits.

Fault: pług overheating.

Check: pług value, ignition timing, fuel octane rating (too Iow) and fuel mixture (too weak).

Lead Glazing - Pług insulator firing tip appears yellow or green/yellow and shiny in appearance.

Fault: often caused by incorrect carburation, excessive idling followed by Sharp acceleration. Also check ignition timing.

Electrode Damage - Electrodes burned away: core nose has burned glazed appearance.

Fault: pre-ignition.

Check: for correct heat rangę and as for ‘overheating’.

Carbon Fouling - Dry, black, sooty deposits.

Fault: over-rich fuel mixture. Check: carburettor mixture settings, float level. choke operation, air filter.

Split Core Nose - (May appear initially as a crack).

Fault: detonation or wrong gap-setting technique.

Check: ignition timing, cooling system, fuel mixture (too weak).