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The Ford Three-Valve Broken Spark Plug Blues

How To Avoid A Heart-Stopping Repair Bill For A Maintenance Item

By Jim Allen, Photography by Jim Allen

Dire Straits: Using the Lisle Tool When Things Go Bad Who is this masked man? The Lisle Tool should be wearing a white hat and a black mask. Like the old Lone Ranger, it rides in to the rescue and snatches your Ford 3V engine from the jaws of catastrophe. Many people think this tool is the best $99.95 (current list price) they ever spent.

  • When the plugs break, they do so in several different ways. The good way is when the entire porcelain piece completely pulls out of the tip or breaks off well below the point where the sleeve separates from the body. When that happens, you can use the puller assembly to thread into the end of the tip and pull it out.
    When the plugs break, they do so in several different ways. The good way is when the entir
  • The bad way is when the porcelain breaks off flush in the tip or not deeply enough to thread into.
    The bad way is when the porcelain breaks off flush in the tip or not deeply enough to thre
  • If it breaks off in the good way, you can proceed directly to the puller. The end has tapered left-hand threads, like a tap. The washers are for the slightly different depth dimensions among 3V heads. The aluminum sleeve goes in first, then the puller screw. Screw the tap portion of the screw into the tip until tight. It has to go in a few threads to get a good grip.
    If it breaks off in the good way, you can proceed directly to the puller. The end has tape
  • Screw the hex nut down to the housing (it's also left-hand thread) and, while holding the screw part tight, tighten the big nut.
    Screw the hex nut down to the housing (it's also left-hand thread) and, while holding the
  • And, voila, out comes the tip!
  • If the plug broke off in the bad way, you need to use the pusher tool to push the broken porcelain deeper into the tip so you can thread the puller assembly into it. The pusher is shown here in the extended position, so first turn the nut on top counter-clockwise and retract it.
    If the plug broke off in the bad way, you need to use the pusher tool to push the broken p
  • Screw the body down into the sparkplug hole until it seats. Then, while holding the pusher body, turn the pusher screw nut clockwise until it bottoms. You can't go too far with this tool.
    Screw the body down into the sparkplug hole until it seats. Then, while holding the pusher
  • This is what it looks like inside after the pusher is done. The porcelain is pushed to the electrode, but no further. That means very little danger of large broken parts inside your engine.
    This is what it looks like inside after the pusher is done. The porcelain is pushed to the
  • Some tools and home remedies can drive the porcelain through the electrode (left tip) and that's how you end up with stuff in your engine. The Lisle will push the porcelain only as far as the electrode (right).
    Some tools and home remedies can drive the porcelain through the electrode (left tip) and
SOURCES
Champion Spark Plugs
26555 Northwestern Highway
Southfield
MI  48033
248-354-7700
www.federalmogul.com
Lisle Tools
P.O. Box 89
Clarinda
IA  51632
712-542-5101
www.lislecorp.com
By Jim Allen
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