Jim,
One thing you might want to look at is the water pump, even though it may be
a new one. I had a heating problem with my TR6, and I tried just about every
thing to cure it, except the water pump, since it was a new one that had been
put on just before I got the car. Finally, out of desperation, I bought a new
one, hoping that maybe, just maybe, the pump was the problem after all. When
I pulled the existing pump, I almost didn't replace it because it looked
perfect -- no sign of wear at all.
However, on real close examination, I noticed that the impeller blades were
not quite square, but sloped just a little as shown below:
This,
____ _____
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Instead of this
_____ ____
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The impeller being on the left, and the housing on the right. The difference
was less than 1/16" , probably only 1/32", but it was enough to allow water
to slip past the blades without being pumped. The pump came from the factory
this way. After I replaced the pump, the cooling problem disappeared. I can
sit and idle on the hottest day with no problem, whereas before, it would
over heat in just a minute or two even on a cool day. You might want to take
a look at your pump, just to see if there is something along these lines --
especially after you've looked at everything else to no avail. Maybe your
impeller blades are too short, too narrow, etc.
Dan Masters,
Alcoa, TN
'71 TR6---------3000mile/year driver, fully restored
'71 TR6---------undergoing full restoration and Ford 5.0 V8 insertion - see:
http://members.aol.com/danmas/
'74 MGBGT---3000mile/year driver, original condition - slated for a V8 soon
'68 MGBGT---organ donor for the '74
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