My 67BGT came with an overflow bottle. Here is a picture taken by the
previous owner:
http://cu.imt.net/~dcouncil/mg/99mgeng.jpg
Although the 67BGT had a few alterations, it was still mostly original
and I have started the process of reverting the car fully original
(close that is, within reasonable means). The overflow bottle has been
removed and I have replaced the air filters with original ones.
However, the change has allowed me to compare the car with and without
the overflow bottle. It of course isn't "needed" but it does provide
some conveniences much preferred by the masses. It is easy to tell if
coolant levels are low just by sight and easy to top up, even when the
engine is hot. Without it, the car eventually starts running hotter than
normal, maybe after six months or so, where upon I have to let the
engine cool down until the radiator is under minimal pressure, and then
top up the coolant. With the earlier models, it is easier to overfill
which is no problem as it will overflow the excess to the ground through
the overflow tube, leaving a small trail on the ground whereas the
overflow bottle contains such leakage. So the overflow bottle does
represent some small advances in coolant maintenance.
David Councill
67 BGT
72 B
73 B
-----Original Message-----
From: mgs-bounces@autox.team.net [mailto:mgs-bounces@autox.team.net] On
Behalf Of Bob Donahue
Sent: Tuesday, June 23, 2009 8:21 AM
To: mgs
Subject: Re: [Mgs] Flushing the cooling system?
I never understood the need for an overflow bottle. If you read the
owner/shop manual on any "pre-overflow-bottle" car, you will discover
that
the radiator itself has a fill line or at least a spec about the fill
level.
In other words the very top of the radiator is supposed to be empty. The
top
of the radiator itself is the "overflow bottle".
Perhaps too many people were blindly filling their radiators to the very
top. The government decided to put the fill line "in your face" with the
overflow bottle. Of course you can still fill the overflow bottle to the
top. Then you need an overflow bottle for the overflow bottle ;-)
I bet the auto makers are just thrilled about the overflow bottle
requirement. They really needed something to fill the vast void under
the
hood of the modern car ;-)
Bob Donahue (Still Stuck in the '50s)
Email - bobmgtd@comcast.net
Cars: 52 MGTD - #17639
71 MGB - #GHN5UB254361
Member: NEMGTR #11470
NAMGBR # 7-3336
Hoosier MGB Club
Olde Octagons of Indiana
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