Richard and others,
I have just gone through this with my tiger let me tell you what I did and
found. I would welcome some advice as well.
I have a 67 MK1A (built in October of 66 for those of you who wonder about
it) with a warmed up 260. I have a stock radiator, 5 blade fan and all
shrouding suggested by the various sites. It runs hot, very hot (as
indicated by the temp gauge). Though puking has been very limited even when
the temp gauge has seen 230-240.
--I pulled off the radiator and had it checked -- no blockage at all, very
clean.
--Purchased and installed an Edlebrock Victor water pump (I had a stock
unit)
--Checked all hoses and belts -- spring installed in lower hose and I could
not see any hose collapse
--Two different thermostats, 180 and 160, two diff styles
Put all of these in and found no difference with my idle temp (it's been
raining so I can't do a road check, yet)so I then:
--Borrowed an infrared, laser thermometer (these are cool) and checked all
the typical locations, radiator inlet, t-stat housing, manifold next to the
temp sender, overflow tank, radiator outlet, garage floor, fender, my hand,
the back of my kids head and my Dr. Pepper -- you get the idea.
--The temp gauge was within 5 degrees of the manifold temp and all other
measurements seemed reasonable in conjunction with the manifold temp.
In the process of removing and changing out the thermostat I noticed
something. The temp sender is not immersed in the flow of the coolant.
This is because I am using a Weiand manifold and I had to make an adapter to
mount the stock sender. This adapter raises the sending unit up into the
manifold casting approx 1/8 to 1/4 inch. It is very possible that air can
get inside this "tube" and turn to steam and give the sending unit a false
reading. At best the lower part of the sending unit would be in water and
the top part could be in steam. Has anyone else seen this? I have a friend
that has the same setup and his seems to be operating fine.
If the problem is not solved after all this I am seriously considering
removing the engine and taking more drastic measures.
Any suggestions would be appreciated.
Lynn
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