First thing I did on the Renault was attempt to remove the dynamo to get the plugs out so I could soak the seized bores.
Can't remove the through bolt as, instead of being put in from the back so it will come out over the distributor with the cap off, it has to come out the front, but the water pump pulley is in the way.
Never mind, I'll remove the mounting bracket from the block instead.
Oh, the water pump adjustment lever is also bolted to this (why the hell have two belts next to each other, one for the dynamo and another one for the water pump, with separate adjusters?!) .
Need to slacken off the water pump belt adjuster and remove the belt first.
No problem, apply 13mm spanner to locking nut (no thread visible) and heave. No joy.
Locate metre-long "resistance is useless" bar and apply undue force.
Nut breaks thread off hefty 10mm diameter steel bar. WTF? No rust or other damage evident.
Chances of getting a replacement less than zero.
Fast forward to FoD event and AnthonyG kindly donates a pristine Renaul 6 owner's handbook to the cause (many thanks Anthony).
Idly perusing said publication this evening.
"Water pump drive belt.
The adjustment is carried out by moving the tensioner pulley after unlocking its bracket (left hand thread)". My emphasis not theirs.
Mystery solved. If you tighten up a tight bolt even tighter with a very large bar, it breaks.
But why the (expletive deleted) is it left hand thread? I can see absolutely no reason for it being thus except French.
Don't you just love foreign tat?
Current answer is tending towards the not at all.
Maybe by tomorrow I'll feel less inclined to set fire to it and claim on the insurance (oh wait, there isn't any).
At what point does "quirky eccentricity" turn into "pain in the a**e"?
Answers on a postcard please.