> My question concerns the correct sparkplug for a
> 1968 M725 with the
> original engine.
>
> The vehicle has five Autolite AER35A (MS 35909-4)
> plugs with a 1/2"
> reach, and one AER2243 (MS 35909-1) with a 3/8"
> reach.
The correct MS number for stock plugs is: MS 35909-6.
I looked at the
> M715 Zone and got their specifications page which
> lists Autolite AER72S,
> and AV42(New 515).
This will need to be edited as the correct original
designation is: AER72S
I ordered a single plug from a
> Mil Veh supplier and
> he sent me an Autolite 2245 (MS 35909-2) with a 3/8"
> reach.
Sorry, but this isn't the right one. The correct plug
is a 1/2 inch reach, 14mm thread. I called Autolite,
Allied Signal, 401-434-7000, and after a lengthy
discussion, found the 2344 Autolite plug to be the
proper plug.
> What do the numbers mean?
One of the numbers tells the heat range, one tells it
is a resitor or non resistor, and one is for the
military shielded type waterproof plug, as opposed to
the several other types that are made for other
vehicles.
> Thanks for any info.
No problem, thanks for pointing out our page had the
wrong number!!
===
Sincerely,
Jon Schmidt
President
The M715 Zone
http://www.clubs.yahoo.com/clubs/them715zone
1967 M-715
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