On Tue, Jul 1, 2014 at 2:55 PM, Bill
Bradburry <flyrotary@lancaironline.net> wrote:
Well, not much activity in the last couple of weeks!?
So when I designed my cooling system I installed a fire extinguisher bottle
that I had welded a radiator neck onto. B I put a 21 pound radiator cap on
this bottle. B I keep the bottle about 3/4 full of coolant. B If there should
be an overflow of this bottle and the pressure is exceeded, the coolant
would flow overboard. B AFAIK this has never happened. My coolant pressure
runs around 20 pounds in flight, so I assume that the radiator cap is
burping air to keep the pressure at that level.
I have a tube from the bottom of this fire extinguisher that goes to the
overflow tube in the radiator neck of the radiator. B This radiator neck has
a radiator cap that has no pressure control under it. B This radiator cap
only seals at the top and does not block off the lower seal that is present
in the radiator neck. B I take my coolant pressure from this tube that goes
between the radiator neck and the bottom of the coolant bottle
Recently after I shut the engine off, I noticed that I was loosing coolant
from the area of the radiator cap on the radiator. B The radiator cap is
probably 7-8 years old but I only have about 130 hours running the engine,
100 of which is in flight. B I assumed that the radiator cap was leaking and
so I decided to replace it.
Easy said not so easy done!
I have looked high and low for a radiator cap that does not have the spring
loaded pressure regulator under it. B Most auto parts guys just say HUH?
I didn't write down any part numbers when I bought it and don't even really
know where I got the damn thing.
Does anyone have a similar system and or know where I can get a replacement
radiator cap?
I have considered getting a regular cap and drilling a bunch of holes in the
lower seal but I would prefer not to do that if possible.
Thanks for any help!
Bill B
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