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MG Car Repair/carb adjustment

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Question
I have a stock 1976 MGB with rebuilt carb that when shut off and try to restart to soon floods out. If let cool off starts

Answer
Hi Doug

My first thought is that this is a hot restart problem due to a faulty heat shield between the carb and the exhaust manifold.  If your heat shield is damaged or missing, fit a new one.

The Zenith Stromberg carb has an automatic choke.  This can fail, causing a rich mixture when the engine is hot.  Not only will this give problems on restart, it will also use more fuel as you drive along.  If you are using more gas than usual, I would suspect the auto choke.

Old Stromberg carbs can also suffer from over-fuelling when the diaphragm starts to get old and hard (before it eventually splits).  A new diaphragm will be more soft and pliable, allowing the piston to rise further and let more air into the engine.

Finally, it could be a failing ignition coil.  Next time it happens, open the hood and touch the coil.  Is it hot?  If so, try fitting a new coil.  

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Barrie Jones

Expertise

MG Sports Cars from 1949 to 1980 - Including MGB, MGBGT V8, TF1500, TF, TD and modern Midgets. I also specialise in SU carburettors, Lucas wiring, suspension, steering & brakes.

Experience

I have owned my 1955 TF1500 since 1966. Technical specialist for the TD and TF with the MG Car Club T Register. Also owned 20 MGBs and currently own an MGBGT V8. Written 3 books on MGs and produced a DVD on how to strip and rebuild the TD/TF gearbox.

Organizations
MG Car Club.

Publications
Barrie's Notes on the 1953-55 MG TF (author). /=====/ Barrie's Notes on the MGB (author). /=====/ Barrie's Notes on the MGB GT V8 (author). /=====/ The Essential Buyer's Guide to the MG TD, TF and TF1500. (author)

Education/Credentials
M Phil, C Eng, BSc (Eng).

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