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MG MGB GT V8 Factory Originals Technical - Oscillating temp gauge

Gents,

I've seen it discussed before, and had a look through the MGCC V8 Workshop Notes but couldn't find a solution;

The temp gauge on my (Rover) V8 will rise to about max, then rapidly fall off to just under 'N' then slowly climb back to max.

Help appreciated. I know it's a common issue.

Regards, James

J E G Eastwood 1

James, it sounds to me like you are getting steam pockets in the heads. Is your radiator below the highest point in the cooling system? The proven solution would be a surge tank, properly designed and installed.

Jim
Jim Blackwood

Right, I had this problem until recently, I had air in my upper radiator hose. I fixed the problem by installing an in-line filler at the highest point in the system.
http://i11.photobucket.com/albums/a154/filospinato/P3110617.jpg
Jake Voelckers

Jim - thanks, my set up is standard factory V8 so I assume that all is at correct height.

Jake - I do have a plastic plug in the top of the radiator tank, I will top up there and test, thanks.
J E G Eastwood 1

James,
This may also be a sticking themostat in the block.
It sticks , the temp rises , it opens and the temp falls and so on.
Had this happen but on a Chev V8 and a new stat fixed it immediately.

Cheers, Pete.
Peter Thomas

This thread was discussed between 14/05/2006 and 17/05/2006

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