Allo Tracy,
I was rereading your Rotary News dated 11/01/97, when I noticed your article on cooling systems. Even if I do not have cooling problems I tried your suggested improvement fix at that time, but could not see any noticeable improvement in cooling system behavior or pressure.
While reading I was looking at the coolant filler cap for my 1986 13B and noticed that shimming the mating surface of the cap also has an effect on the coolant recovery check valve by raising it by the same shim dimension.
Is it advisable to also drop a shim inside the bottom of the coolant filler neck in order to equalize dimensions and restore the check valve function?
Yvon Cournoyer.

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