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I'm going to answer my own question: the lubricant is for the seal, which is a
ceramic against a machined metal surface (not the bearings, obviously).
----- Original Message -----
Oh boy! A 'hot' (pun intended) topic right up there with oil and tires ;)
'Coolant'--to my pedantic eye--is a mixture of water and antifreeze. The
antifreeze is mostly ethylene glycol--some use propylene glycol, which is
non-toxic but slightly less efficient--with some pump lubricant* and corrosion
inhibitor. The corrosion inhibitor is a mild acid that gets 'used up' over
time:
http://www.google.com/patents/US6096236
Usually, coolant life is expressed in miles; modern formulations can go over
100K miles before recommended change-out, but since our Healeys aren't going to
be driven that much time becomes the issue (iron engines will rust just
sitting). I would say change it every 5 years or so (which might only be a few
thousand miles of driving for some owners).
I believe the 'waterless' coolants are mostly propylene glycol and are quite a
bit more expensive than ethylene glycol formulations. You'd still need to
change it out when the corrosion inhibitors get used up; IMO it's a gimmick.
Bob
* it just occurred to me that the only thing that needs lubricating in a water
pump is the bearings, but the last thing you want in the bearings is water. Am
I missing something?
----- Original Message -----
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<html><body><div style=3D"font-family: Arial; font-size: 12pt; color: #0000=
00"><div>I'm going to answer my own question: the lubricant is for the seal=
, which is a ceramic against a machined metal surface (not the bearings, ob=
viously).<br></div><div><br></div><div><br></div><hr id=3D"zwchr"><div styl=
e=3D"color:#000;font-weight:normal;font-style:normal;text-decoration:none;f=
ont-family:Helvetica,Arial,sans-serif;font-size:12pt;"><br><div><br></div><=
div style=3D"font-family: Arial; font-size: 12pt; color: #000000"><div>Oh b=
oy! A 'hot' (pun intended) topic right up there with oil and tires ;)=
<br></div><div><br></div><div>'Coolant'--to my pedantic eye--is a mixture o=
f water and antifreeze. The antifreeze is mostly ethylene glycol--som=
e use propylene glycol, which is non-toxic but slightly less efficient--wit=
h some pump lubricant* and corrosion inhibitor. The corrosion inhibit=
or is a mild acid that gets 'used up' over time:<br></div><div><br></div><d=
iv><a href=3D"http://www.google.com/patents/US6096236"; target=3D"_blank">ht=
tp://www.google.com/patents/US6096236</a><br data-mce-bogus=3D"1"></div><di=
v><br></div><div>Usually, coolant life is expressed in miles; modern formul=
ations can go over 100K miles before recommended change-out, but since our =
Healeys aren't going to be driven that much time becomes the issue (iron en=
gines will rust just sitting). I would say change it every 5 years or=
so (which might only be a few thousand miles of driving for some owners).<=
br></div><div><br></div><div>I believe the 'waterless' coolants are mostly =
propylene glycol and are quite a bit more expensive than ethylene glycol fo=
rmulations. You'd still need to change it out when the corrosion inhi=
bitors get used up; IMO it's a gimmick.<br></div><div><br></div><div>Bob<br=
></div><div><br></div><div>* it just occurred to me that the only thing tha=
t needs lubricating in a water pump is the bearings, but the last thing you=
want in the bearings is water. Am I missing something?<br></div><div=
><br></div><div><br></div><hr id=3D"zwchr"><br></div></div></div></body></h=
tml>
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