The Blue (Number 242) Loctite is a good general purpose thread locking
adhesive....Permatex make a similar medium strength product with an
identical color. The blue is intended to keep parts together until you are
ready to take them apart again. I just finished rebuilding the Tecumseh
engine on my Toro mower and Tecumseh wants #242 to keep the block assembly
together until you break another connecting rod (every few years). (Painting
a Toro John Deere green makes it look better -- but that's another issue).
The red Loctite (#271) is intended for 'permanent' assemblies -- I used it
for years on a '64 Triumph Spitfire which normally fell apart about every
2-3,000 miles no matter what. I'd use the red where I REALLY wanted
something to stay together and there is a lot of vibration -- or the threads
are a little "iffy". You don't always need heat to take Loctite red
apart -- just use a reasonable amount when assembling the parts.
This email scanned by Norton Antivirus.
Pete Koernig
'70 1600 almost done '69 2000 'lot of work left
----- Original Message -----
From: "Gary Boone" <gboone@sisna.com>
To: <ambradley@attbi.com>
Cc: <datsun-roadsters@autox.team.net>
Sent: Tuesday, April 22, 2003 8:47 AM
Subject: Re: Thoughts on loctite?
> There are 2 types of thread locker. There's medium strength (usually
> blue) and high strength (usually red). Fasteners that have the medium
> strength applied will break loose with hand tools. The high strength
> requires heat. I rarely use the high strength but a PO used it on my
> cam cover studs, which broke off flush with the top of the head when I
> tried to remove them. Blue is OK for most applications, but should
> never be used on rod bolts if you use the torque method for tightening
> the nuts. For flywheel bolts (like rod bolts), they're pre-stressed so
> much, if torqued properly, that they shouldn't loosen anyway. I've
> never seen the 2 bolt locking tabs or star washers on flywheel bolts.
> Gary
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