Douglas --
I don't know whether you have the problems with fuel going bad (turning to
gum) from sitting in the tank for months, as we have up here, but it sounds
as though your problem is too much fuel rather than not enough spark. In
addition to Bill Beech's suggestions:
Take the lids off the float bowls and make sure that the floats are actually
floating. They can stick on their shafts and not rise as the bowls fill, or
spring a leak and allow fuel in, which will make them not rise far enough to
shut off the fuel (I've had this problem in the past).
If you can get the car to start, take the air cleaner manifold off and work
the throttle by hand to see whether the pistons might be sticking in the
dashpots at some point, and not falling back down.
I remember sending you a pattern for the under-dash panel many years ago!
Glad to know your car is on the road.
Sarah Carr
TD3942EXLU in PA (USA)
-----Original Message-----
From: Douglas Ormrod
Sent: Monday, October 31, 2016 9:21 PM
To: 'mg-t@autox.team.net'
Subject: [Mg-t] Post winter TD blues
Greetings from New Zealand
Long-time no chat, but long-time no problems.
My 51 TD has given very little trouble over the last 8 years, but now it is.
It has had very little use over the last six months, it was winter and I
must be getting soft. Perhaps 4 outing and 50 miles. Summer now here.
Started OK at the weekend, but before I could take off it started running
very rough - sounds like down to three or two cylinders and backfiring
through muffler. Coaxed back into the garage on almost no power.
Took out plugs (which were new six months ago) and they were covered in soft
black soot. New plugs are NKG B7ES, old ones were NKG B5ES. Cleaned them up,
also cleaned all distributer contacts, rotor contact, and took out cleaned
and reset the points. Checked cables for tightness. Started easily and took
it for a 10 mile run - apart from a little missing at first all seemed fine
once it warmed up. Power as normal.
Decided to take it work today (sun out), but same scenario, started and
sounded OK, but after a few minutes ticking over started running very rough,
backfiring and power gone almost gone. Plugs all black and sooty again and a
couple of them quite wet.
Only part of the ignition system that was not renewed at rebuild was the
lucas sports coil - I did have it checked at the time.
So any suggestions as to the possible source of the problem?
Thanks in anticipation of your collective wisdom.
Douglas
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