[Healeys] Yet another mystery

[Harold Manifold]

Rich,

Your comments "high speed. run of twenty miles" and "extra series of
cooling tubes" may offer some clues. Fan blades flex away from the side
that pushes air, in other words towards the radiator. The extra cooling
tubes may have reduced the clearance between the radiator and the fan.
There isn't much clearance to begin with. The combination of the two may
have been enough for the fan to hit the radiator.

The other issue is what caused the overheating. At high speeds the fan has
little to no effect on cooling. Unless the ambient temperature was very
high and you were going up a steep hill the colling system should keep up.
What was the water temperature gauge saying?

Harold



On Thu, Oct 2, 2025 at 1:39 PM Richard Antal via Healeys <
healeys at autox.team.net> wrote:

> Listers,
>     My BJ8 seems beleaguered with misfortune. A couple of weeks ago I
> noted the oil pressure gauge wildly oscillating at various speeds. It
> vanished two days later.
>     Yesterday a high speed. run of twenty miles produce an overheating
> radiator with fluid spewing from the overflow tube. To my horror, I saw
> that the Texas cooler fan which I'd had for at least 25 years had
> confronted the engine side of the radiator leaving a distinct circular
> impression and abrasion to the tip of one of the fan blades. That radiator
> was rebuilt two years ago with an extra series of cooling tubes and had
> given no problems for at least 5000 miles. I assumed the harness which
> prevents the engine from sliding forward was faulty. Inspection of the
> underside did not support that conclusion--it looked fine to me: all
> bushings and nuts were in place. I ran the engine after filling the
> radiator and saw no evidence of recurrence of the fan nudging the radiator.
> I'm perplexed what to do next. Thanks for your thoughts......
> Rich Antal
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