[AT] Old torque specs

[Larry D. Goss]

There weren't many tapered seat spark plugs back in the 60's Cecil.  I
suspect one of the reasons why they started manufacturing so many of
that style is that they will seal without any sort of gasket of sealing
ring.  

John Deere 40 is one of the models that isn't listed for some reason.  I
haven't been able to figure out why certain models were skipped.  All
the rest of the John Deere letter series and number series tractors
appear to be there.

Most of the spark plug torques specs in the engine listings are blank.
The only ones listed with the engines are the ones that are different
from ordinary.  So there's nothing listed for the Allis series you asked
about.  

For AC spark plugs (14mm) they are tightened to 25 ft-lb in cast iron.
Champion - 26 to 30 ft-lb.
Auto-Lite - 30 ft-lb.

Interestingly, they don't recommend Auto-Lite plugs in aluminum heads
except for aircraft applications.

Larry

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Cecil E
Monson
Sent: Saturday, July 10, 2004 5:40 AM
To: Antique tractor email discussion group
Subject: Re: [AT] Old torque specs

> It also contains a special section on spark plugs with torque specs
> based on thread size in both cast iron and aluminum.  Brands include:
> AC, Almquist, Auburn, BG Corp., Blue Crown, Bowes, Champion, Defiance,
> Auto-Lite, Globe-Union, Hastings, Lodge, Mallory, Reflex, and Stitt.
It
> also has a page on oil filter torque and wheel bearing torque
including
> correct techniques for different brands of wheel bearings.



	Larry, do you think the gasket that comes with spark plugs might
have changed since that torque wrench came out?  The other day I was
putting a new set of plugs in one of the tractors and was thinking that
I remember back 50 years ago we torqued spark plugs down pretty tight.
Now
it seems you don't have to do that any more to get a good seal. The big
spark plugs that came in my JD BR which was made in 1943 had a flat
bottomed
seal and now almost all newer plugs seems to have chamfered sealing
area.
Also, the gaskets on new plugs seems to fit better and seal easier.

	I wondered while reading your post on the old torque wrench,
what
the torque should be on ACs, Champions and Autolites is Allis Bs, Cs and
CAs or my JD 40. Just curious as I just guess at the torque myself and
go
by feel.

Cecil
-- 
The nicest thing about telling the truth is you never have to wonder
what you said.

Cecil E Monson
Lucille Hand-Monson
Mountainville, New York   Just a little east of the North Pole

Allis Chalmers tractors and equipment

Free advice

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