Today's Message Index:
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1. 04:16 PM - Re: IO 360-A2A cylinder stud care (racerjerry)
2. 05:33 PM - Re: Adjusting spark plug gap (racerjerry)
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| Subject: | Re: IO 360-A2A cylinder stud care |
GOOD GAWD
Please dont ever chase male threads with a die on anything that has a remote possibility
of getting off the ground. Most all engine studs and aircraft hardware
(and lately even common hardware store hardware) have rolled threads which
significantly increases their resistance to fatigue. If a threading die is used
to clean male threads, a small amount of metal will be removed at the thread
root, causing stress risers in the bolts at their weakest (narrowest) point.
[b][/b]
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=277664#277664
Message 2
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| Subject: | Re: Adjusting spark plug gap |
Aircraft Spruce now sells a tool to increase the gap of aircraft massive electrode
spark plugs, but I definitely would not recommend it. Years ago I made one
in a lathe from 3/8 diameter 4130 rod by drilling a center hole (about 0.150)
so that the center electrode would pass through and tapering the end about 30
degrees to a sharp point. The pointed tip was heated to red and immersed in
oil to harden it.
I RARELY used this tool, because slight sideways pressure on the center electrode
could easily crack the spark plug insulator, rendering the spark plug useless.
For Lycoming engines, Lycoming Service Instruction 1042Y (or later) governs approved
spark plugs. In SI 1042Y, it also states that Spark plug gage must be set
at .016-.022 inch. If your gaps are no tighter than .015, you have nothing
to worry about and the gap will soon self correct with use.
At this point I am a whole lot more careful about squeezing the electrodes closed
when using my gap adjuster tool (also homemade) and have not been tempted to
use the gap enlarger tool in a very long time.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=277674#277674
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