Thanks for the advice - the steam hose was definitely blocked at the
manifold take-off. Time will tell if it cures the problem.
Cheers,
PaulH.
http://freespace.virgin.net/paul.hunt1/
-----Original Message-----
From: KILE, PAUL D <Paul.Kile@Aerojet.com>
To: 'Simon Holt' <simon.holt@tdsi.co.uk>; Paul Hunt <paul.hunt1@virgin.net>;
'Jim Stuart' <jimbb88@erols.com>
Cc: mgb-v8@autox.team.net <mgb-v8@autox.team.net>
Date: 14 March 1999 18:05
Subject: RE: Cooling
>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
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