[s-cars] Spark Plugs

[Paul Gailus]

John,

I totally agree.
The crush washer on the F5DPOR's is the type that's
folded over into a hollow ring, and has little resiliency
once it's been flattened.
I've had success with Champion Aviation Group
#2612 spark plug lube and anti-seize.
Only a little on the 2nd and 3rd threads just like
in the directions to prevent any graphite from getting
down onto the ceramic insulator tip.

Paul

----- Original Message -----
From: <j.n.tilden at comcast.net>
To: <S-CAR-List at audifans.com>
Sent: Monday, September 12, 2005 10:28 PM
Subject: [s-cars] Spark Plugs


> Many time I have seen the reference to torquing spark plugs to some value
(22 ft-lbs etc.)
> I recall sometime deep in the dark past of my history as a young mechanic,
reading some literature about spark plugs and saw a recommendation for
tightening spark plugs.
> Tighten the plugs hand tight into chased and cleaned openings and then
tighten an additional 90 degree of rotation.
>
> The key here is clean and chased threads. I also have always (here it
comes) used anti-seize in all applications as a lubricant and an aid to
removing the plugs in the future. I have an extensive and successful history
of never loosing a spark plug, nor stripping out a spark plug hole in
un-countless applications of air and water cooled aluminum cylinder heads!
So lesson here is:
> 1. Get a spark plug thread chasing tool! ( sort of a dull Tap with a long
guide portion, Sears as 'em)
> 2. Use it every time!
> 3. Clean out the residue after using it, I use compressed air.
> 4. Apply an eviromentally approved (lead free) anti-seize compound every
time!
> 5. Finger tight, plus 90 degrees of rotation!
>
> The key here is the spark plug washer is a crush washer. Use a new washer
every time and success is assured! Don't use your old plugs over again they
are too cheap to take a chance on scewing up your head!
>
> The most important part of the heat tranfer path of the spark plug is the
path from the body of the spark plug to the cylinders head. If this
interface is not clean, or the mate betweeen the cylinder head and the spark
plug body are imperfect then the heat range for your spark plug is all
messed up. If this interface is not as designed then your plugs will run too
hot. Too hot a plug in a high perforance engine is an invitation to
disaster!
>
> Soap Box OFF!
>
> John
>
> 1995.5 S6 Avant
> (many aircooled/watercooled german automobiles in my past)
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list