I have now done some 16,000 fast & furious road miles using Valvemaster UCL
since leaded patrol became a no-no, so I have been watching carefully for
signs of VSR. ( BLMC 'B' 1.8 motor)
There may be no connection, but I have suddenly found that I am losing up to
1.5Pints of water during a 2 hour run, previously the level would stay an inch
or so down from the filler neck for months at a time. We have never
overheated, but I now notice the trend particularly in slow traffic.
I have fitted new thermostat ( 82'C) & 7psi cap, have no external leaks, and
have lifted the open overflow so that it would not siphon. All to no avail. I
have no sludge on Oil cap, no water in oil or oil in water.
I suspect that the rad system is being presurised and water loss is to the
road under acceleration, when it cannot be seen, So today I rigged a plastic
catch bottle and sure enough in 10 minutes collected a half pint of overflow.
I am more worried by the steady trickle of bubbles through this overflow even
on tickover, which, I suspect may indicate that I have a slightly leaking head
gasket or even a cracked head. Could a recessed valve seat have breached the
water jacket, sounds unlikely?
Next Job, to check again my rocker gaps.
Just trying to catch it before I have a roadside problem.
Would welcome your collective experience please.
Tks
Colin
'67B
'97F
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