Simon, Paul,
Have you checked your "steam hose"? This is the small diameter hose that
goes from the water outlet downstream of the thermostat to the intake
manifold just below the carburetter adaptor plenum. I believe this was
Rover's attempt to provide a bypass bleed for the thermostat, allowing
trapped air in the highest point of the cooling system to bleed back to the
upper radiator hose. When I checked mine during disassembly, both nipples
were blocked with sediment. I had to use a 1/8" twist drill to clear them.
I don't know if later Rover blocks used this arrangement, but all the
Factory GT V-8s used it.
Cheers,
Paul Kile
> -----Original Message-----
> From: Simon Holt [SMTP:simon.holt@tdsi.co.uk]
> Sent: Sunday, March 14, 1999 2:16 AM
> To: Paul Hunt; 'Jim Stuart'
> Cc: mgb-v8@autox.team.net
> Subject: RE: Cooling
>
> Thanks, Paul & Jim
>
> I'm sure now its an airlock. I took the car for a good run yesterday,
> and at one point I realised the heater had been gradually cooling down
> when it suddenly started pushing out hot air again. As for the gauge,
> when it settles down it reads as expected; the problem really is the
> wild fluctuation before that happens (and of course that's only a
> problem if any part of the engine is running too hot; if not, then the
> black tape over the gauge is the answer!)
>
> Although I'm not a slave to concours or originality, my car is an early
> factory model - #127 making it contemporaneous with the Press cars.
> So I'm looking for a solution which involve no mods or easily-reversible
> mods.
>
> I'm assuming that if I can get rid of the airlock by careful bleeding, and
>
> keep enough coolant in the header tank, then no new air can enter the
> system.
>
> Simon Holt
|