Homemade timing tool

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Revision as of 22:11, 23 August 2011 by Mycider (talk | contribs) (category)
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This has been done before many times and i am not claiming to have invented any of this but i did take pictures. thanks to anyone whose posts and threads helped me make this thing

thanks to everyone who posted in this thread

http://www.mopedarmy.com/forums/read.php?7,1935881,1936079#msg-1936079

Timingtool.JPG

homemade timing tool

tools

  • hacksaw
  • bench grinder for bolt head
  • hammer
  • file

materials

  • spark plug
  • metric bolt (1.00 thread pitch 60 or 70 mm long i think. it was the longest one they had where the threads go the length of the bolt)
  • nut for said bolt
  • small spring (i will try and get more info on exacts of spring, maybe get the home depot part number or something.)
  • washer (with o.d. large enough to sit on top of spark plug part but small enough that you can still get a wrench over it)


how to gut the plug

you want the guts of the spark plug gone. The easiest way i have found is to put it in a vice and cut off the blue colored (i colored it, see pic) shoulder on the plug with a hacksaw:

Wheretocutplug.JPG

you dont have to cut all the way through, just enough to get through the metal. turn and reapeat

Hackplug1.JPG

plug with shoulder cut off

Hackplug2.JPG

hacksaw off the ground electrode.

Wheretohack3.JPG

wack the center electrode with a hammer a few times and the guts should pop right out.

Wheretohack2.JPG

disassembled spark plug

Dismantledsparkplug.JPG

clean up the spot where the ground electrode was and probably the top side too so the washer will sit flat

Roughelectrode.JPG

Smoothelectrode.JPG

assembly

Ok, the hard part is over. Now you need to grind down the bolt head so it will fit into the spark plug hole. A nice rounded top on the bolt will help center the tool and improve accuracy.


pay attention to the length of the spring. If you have the spring compressed the distance between the bolt head and spark plug washer should be less then 20 mm. About 18mm is fine.. You still should have spring action around 24mm.


check out the washer with marks for tenths of a mm. you can make a circle on paper and the mark every 36 degrees around the circle. then connect the marks to the center of the circle. next place the washer in the center of the circle and transfer the marks to the washer with a dremel or a file. putting a zero or other distinctive sign on one of your marks on the washer will help you keep track of where you started to measure from. V shaped marks on opposite sides of the nut facing opposite ends will help with accuracy. The upside down marker acts as half way, and whichever way you put the nut on, one of the marks will be right side up.

Timingtoolparts.JPG