A Minor Setback
Posted: Fri Sep 28, 2018 5:19 pm
Three weeks ago, the memsahib and I set off in Myrtle the Minor to attend and be part of a local village festival which incorporates, inter alia, old/classic/interesting vehicles. We had travelled but half a mile when, quite uncharacteristically, Myrtle coughed, spluttered, issued a noxious grey cloud out of her exhaust pipe and began running very rough before cutting out completely. Managed to freewheel (the road was slightly downhill) to a safe stopping place where I tried a restart, to no avail, before having a look under the bonnet for anything obviously amiss, of which sign there was none. Had a look at the points, which were clean and showing a reasonable-looking gap (later confirmed to be 15 thou), tried the starter again but all I could get was a bit of firing followed by rough, two/three cylinder running for a few seconds. At this point the memsahib (keeper of the modern telephone) called the breakdown people.
An hour later, Adrian, a very pleasant breakdown person arrived. Carried out all the usual checks, including spark from king lead to earth (looked healthy enough), petrol present in tank etc then pulled off the clean (brand new in fact) air filter to look at/into the carb. Thought he detected a little stickiness in the piston movement so gave it a spray of carb cleaner. Next he observed that the petrol level in the transparent filter seemed rather low and wondered if the petrol pump was failing. Pulled off the pipe to the carb and held a rubber glove over the end of it while I turned the ignition on; petrol confirmed to be flowing. After quite a lot more such tinkering the engine started and ran normally so we drove back home with Adrian following to ensure we got there safely, which we did. However, as soon as I reversed on to my drive the rough-running re-commenced and the engine cut out. Despite Adrian's further efforts over the next half hour, no resolution could be achieved and, reluctantly, he left to attend to others, saying that he still thought it might be the fuel pump or, possibly a partially blocked jet.
Over the next couple of weeks I removed the pump, which appeared to be working, albeit rather more feebly than I would have anticipated, so I cleaned up the points, resulting in a bit more zippiness in its action and refitted it, with absolutely no difference to the non-starting problem. Then I took the carb off, partially stripped it (it all looked OK to me) re-assembled and re-fitted it, topped up the dashpot to be on the safe side and tried again. Still no start, just desultory firing followed by lumpy running for a few seconds.
By now I was out of ideas. Decided the only way forward was to call in the cavalry so I phoned Chris Flack, a very trustworthy and honest young local mobile mechanic, wondering if he was fully au fait with the vagaries of old-fashioned motors like the Moggie as, obviously, he spends much of his working day interpreting computer-based diagnostic information for modern vehicle servicing and repair. I needn't have worried. 'Sounds like a faulty condenser' was his reaction when I told him about my tribulations. 'Try replacing it and, if it doesn't work, ring me back and I'll arrange to come along and have a look at it for you.' Well, being a cautious soul and, having learnt years ago about the wisdom of having a new set of points and condenser to hand, I'd already assembled a 'vital tools' kit for the car, including the aforesaid points and condenser. The new condenser resolved the problem immediately and entirely. So, the old adage, '90% of all carburettor problems are electrical' has once again been demonstrated and the mere fact that the points and condenser are nearly new, apparently in perfect condition and therefore cannot be the source of the problem is possibly the greatest red herring in old car ownership.
An hour later, Adrian, a very pleasant breakdown person arrived. Carried out all the usual checks, including spark from king lead to earth (looked healthy enough), petrol present in tank etc then pulled off the clean (brand new in fact) air filter to look at/into the carb. Thought he detected a little stickiness in the piston movement so gave it a spray of carb cleaner. Next he observed that the petrol level in the transparent filter seemed rather low and wondered if the petrol pump was failing. Pulled off the pipe to the carb and held a rubber glove over the end of it while I turned the ignition on; petrol confirmed to be flowing. After quite a lot more such tinkering the engine started and ran normally so we drove back home with Adrian following to ensure we got there safely, which we did. However, as soon as I reversed on to my drive the rough-running re-commenced and the engine cut out. Despite Adrian's further efforts over the next half hour, no resolution could be achieved and, reluctantly, he left to attend to others, saying that he still thought it might be the fuel pump or, possibly a partially blocked jet.
Over the next couple of weeks I removed the pump, which appeared to be working, albeit rather more feebly than I would have anticipated, so I cleaned up the points, resulting in a bit more zippiness in its action and refitted it, with absolutely no difference to the non-starting problem. Then I took the carb off, partially stripped it (it all looked OK to me) re-assembled and re-fitted it, topped up the dashpot to be on the safe side and tried again. Still no start, just desultory firing followed by lumpy running for a few seconds.
By now I was out of ideas. Decided the only way forward was to call in the cavalry so I phoned Chris Flack, a very trustworthy and honest young local mobile mechanic, wondering if he was fully au fait with the vagaries of old-fashioned motors like the Moggie as, obviously, he spends much of his working day interpreting computer-based diagnostic information for modern vehicle servicing and repair. I needn't have worried. 'Sounds like a faulty condenser' was his reaction when I told him about my tribulations. 'Try replacing it and, if it doesn't work, ring me back and I'll arrange to come along and have a look at it for you.' Well, being a cautious soul and, having learnt years ago about the wisdom of having a new set of points and condenser to hand, I'd already assembled a 'vital tools' kit for the car, including the aforesaid points and condenser. The new condenser resolved the problem immediately and entirely. So, the old adage, '90% of all carburettor problems are electrical' has once again been demonstrated and the mere fact that the points and condenser are nearly new, apparently in perfect condition and therefore cannot be the source of the problem is possibly the greatest red herring in old car ownership.