[TheForge] shrink fit techniques

[Larry]

For years, when I worked on Harley engines, we kept a cup of anti freeze
in the freezer of the shop fridge.  When we had a valve guide to replace,
we sized up the hole and matched up our guides cold.  We would then drop
the guides in the cup of anti freeze along with the guide punches.  We
then would place the heads on a hot plate with a 1/4 inch steel plate
under them and heated the plate till it was enough for spit to dance on
the surface,  (hi tech thermometer) and assembled the parts as quickly as
possible.  Never had a guide loose in a head, never cracked a head, seemed
to work.

Larry

"Williams, Mark E." wrote:

> All:
>
> A safer bath is dry ice and methanol (wood alcohol). Make sure the dry
> ice is in small pieces so it forms a slurry with the liquid.
>