Dale Smith wrote:

Dear Paul,

A few weeks ago, there was some discussion of the
problem of leaking oil coolers, especially the
stock Mazda ones.

A gentleman facing the same problem on his GSL-SE
decided to make/manufacture some "boss
stiffeners", in the form of split ring collars to
clamp around the existing bosses.

Check them out at
http://www.marx7.org/~slelievre/stiffring.htm  He
is selling a pair for $20, which seems quite
reasonable considering the apparent quality.

What do you think?

Depends on where it cracks. If it cracks in the threaded portion of the boss
these should help. If it cracks down where the boss is welded to the cooler
(a more likely scenario) then these won't help. They may make it worse as
they add to the mass. The best thing is support the oil lines better coming 
into and leaving the cooler.

BTW these look suspiciously like an off the shelf two piece shaft collar available 
from McMaster Carr or Granger.

A stainless steel hose clamp will also work if the boss is cracking in the
threaded portion.

Paul Lamar
 
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