Thanks for everybody who responded to the question regarding type of
sealant, if any, you use on the figure 8's. Here are the results:
Permatex non-hardening - 3
Hylomar - 2
Yamabond
Copperkote
Gaskacinch
Blue RTV
Spray, brand unknown (Mordy's magic goo, I think)
loctite 510 or 563
The reason I asked the question is as follows.
I always use a sealer, too. I'm uneasy about putting 40 year old parts
together metal to metal and expecting them to seal. However, I've found
that every sealant that I've tried has changed the liner protrusion, no
matter how thinly it was spread. It seems that the biggest problem in
building these engines is getting a perfect head seal. I assemble dry,
measure protrusion, and then use figure 8's of whatever thickness is needed
to give the proper protrusion, and I shoot for less than the factory spec
-- I try for .003. However, when I assemble dry, then use sealant, it
increases protrusion. I have even recorded protrusion at assembly time with
goo on the gaskets, and then recorded the protrusion again when the engine
is disassembled. I find that it doesn't all squish out. The change in
protrusion seems to last.
I'm going to do my engine again, and am considering alternatives. I might
take the sealant thickness into account when setting the liner protrusion.
Or maybe I'll decrease protrusion to help the seal at the water jacket
openings and rely on the o-ring to seal the combustion chambers. Any more
comments?
uncle jack
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