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Old 07-04-2019, 12:26 PM
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MercuryMac MercuryMac is offline
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Default spark-plug thread chaser.

Some spark plug threads are unique, [20 threads per inch instead of 18, and an odd diameter]. You may not have a spark plug thread chaser on hand, and if you have aluminium heads, you may run into galling problems removing steel spark plugs. Here's a way to make a thread chaser. Take a good sparkplug and with a zip-cut grinder, cut two curved slots in it crossways to the threads. I cut mine in a slightly counter-clockwise path so the sloughed-off pieces of steel and aluminium will gather and be forced upwards in the slot, not downwards into the cylinder.
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Old 07-04-2019, 02:23 PM
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Kool tip... thanks!!!

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Old 07-04-2019, 02:38 PM
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Great idea MM, and if you had some thick grease into the grooves, it'll hold on to the chips until you extract it. I've done a similar trick when I was working -
"hot tapped" a LARGE gearbox for a new lube drain line. I drilled and tapped it full of lube, and didn't lose more than about a litre (or a quarter of a gallon)
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Old 07-04-2019, 11:29 PM
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Thanks guys.
Bill that would be a 'rider' tech tip. Grease your new tap. I have some assembly grease, but never thought of it in time.
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