[urq] Rebuild engine seizes after 15sec's . ( non audi ) follow up

[Patrick Carlier]

So I pulled the engione today , and took it apart .

Pistons , rings and bores are good .
Pistons can be pushed out with an index finger .
Bearing shells look ok and are certainly not seized .

Crankshaft turns heavier as TDC's are approached .
Both on the outer and inner pistons .
Finally  I looked at the main bearings , and the nr 5 is totally gone .
Fused to the crankshaft , and the shell  started turning in the bearing cap 
.

So  I guess I found the problem ,  but I haven't got a clue why this happend 
.
Oil channels are free , no cracks anywhere ...

What worries me now is that this is the 1500 block wich had severe big end 
damage .
It's main bearings were also showing the copper layer , but all five of them 
were nicely equally worn
Tis could indicate  a problem with the oil feed somewhere .
I already used the oil pump and filter mount etc from the known good 1600 ..

I 'll call it a day for now .

Big thx to everyone for the many reactions .

Pat