Spark Plugs
Moderators: GAHorn, Karl Towle, Bruce Fenstermacher
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170C
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Spark Plugs
Are the correct sparkplugs for our Cont'l O-300 (B in my case) the 5/8" 24 thread or 3/4" 20 thread? I know, I should know this, but I want to be absolutely sure before I order new ones
OLE POKEY
170C
Director:
2012-2018
170C
Director:
2012-2018
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Metal Master
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Re: Spark Plugs
The easy way for you to know the answer to this is does it take a 3/4 inch wrench or a 7/8 wrench to undo the B-nuts on the end of the plug.
3/4 wrench = 5/8" 24
7/8 wrench = 3/4" 20 thread.
It could actually be either one if someone has changed out the harness to install the 7/8 wrench = 3/4" 20 thread large format (high altitude) sealed ignition leads.
Jim
3/4 wrench = 5/8" 24
7/8 wrench = 3/4" 20 thread.
It could actually be either one if someone has changed out the harness to install the 7/8 wrench = 3/4" 20 thread large format (high altitude) sealed ignition leads.
Jim
A&P, IA, New owner C170A N1208D, Have rebuilt some 50 aircraft. So many airplanes, So little time!
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170C
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GAHorn
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Re: Spark Plugs
Pokey, I'm fairly confident your greenie does not have the "high altitude" anything installed. 
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
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170C
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Re: Spark Plugs
So George I guess I don't need to get pressurized mags
OLE POKEY
170C
Director:
2012-2018
170C
Director:
2012-2018
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