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[T3] strange clunking from final drive and ignition timing


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I've had my fastback on the road for about a month and a half now and in
general am thrilled to bits with it. I've almost stopped the water leaks but
really need to sort out the plenum next summer as it still gets in there.
The past couple of days though I've been getting a strange intermittent
clunking coming from the rear. It comes on particularly when driving hard to
the right and often goes away when driving left. It seems about the
frequency of the wheels going round and disappears if the clutch is pressed
so I don't think its wheel bearings. My guess is it is something to do with
the drive shafts or differential- I'm hoping nothing terminal. Any ideas?
Also I've just realised that I've been driving all this time with my
ignition set wrong. I set it by the Haynes manual diagram which shows 7.5
deg as the second groove in the fan. The car hasn't been running very well
and yesterday I closely examined the remains of the silver sticker on the
fan housing and it shows this mark as being TDC- 7.5 is the fourth mark!
Anyway I adjusted the distributor and the engine runs much better- although
it seems it would like even more advance- the more I advance the faster and
smoother the idle becomes. When I bought the car it was set to about 40 deg
BTDC! and seemed to run fine- though the valves had NO clearance and the
cooling flaps were seized shut. Given this mistreatment it is amazing it
runs at all. Is it possible that the fan could be on wrong as it seems it
would really like more advance?

Thanks in advance for any ideas

Mark Seaton
Orange and Rust 73 Fastback
London


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