Spark plug gap viva

Hi,

I'm not sure quite what you are asking for here. This particular gapping tool is for aviation engine spark plugs. The clue is in the AV at the end. They are available from aviation parts and accessory factors such as LAS & Aircraft Spruce and others. You can often pick them up at aero-jumbles that feature at local air-shows. The unit should have with it a number of ring adaptors, if buying second hand make sure you get the adaptors for the spark plugs you wish to use it for, otherwise it's useless! The ring adaptor screws onto the spark plug and then placed into the gapping tool. This gapping tool can only close the points gap, it cannot open them again if you close the gap too much, you need another tool to open the gap, I don't know the part number but it looks like a little spanner. Don't be tempted to open the gap with a screwdriver against the electrode, you'll crack the porcelain and right-off the plug. Best thing is to get some Champion Aviation spark plug feeler gauges, they are wire type gauges and not flat leaf type. Place the wire gauge between the gap and use the gapping tool to close the gap until it just jams the feeler gauge, stop there and do the other gaps in a similar way.
Rgs. Bob