Cooler failed about three weeks back dumping 2l of engine oil on bike, road and myself resulting in myself and bike being enveloped in a cloud of oil smoke at next red lights much to the amusement / horror of other road users!
Later found that the inlet pipe had come adrift from cooler body / matrix due to failure in brazed (?) join. Seems a quality issue.
Inlet tube (10mm) projects deep into cooler matrix and is more or less held square to body as tube passes through numerous quite close clearance holes at each plate of the matrix. Tube has a 12mm ring that I suppose is designed to make sure tube is at the correct height in body and has a reasonable area for brazing to body. However the ring on the inlet tube was not square to tube, hence body.
Cooler was a new item with 3500km, had recently ridden extensively over cobblestones which may not have helped. Bought two new coolers from Autodoc, one made by Ridex (make of failed item), other by Praesco. Inspected the ring / tube alignment and both good, but otherwise the Ridex item was ‚better‘ looking overall than Praesco item. So Ridex item was painted and installed. 1000 km later all still good.
in future I might not paint any replacement as I wonder if the etch primer may have also affected integrity of ring / body braze. I doubt it, but?
I plan to modify an aluminium AN6 weld boss for fitting over a shortened tube (5-10mm projection) and probably retained to body by JB weld epoxy as brazing would be tricky for me. AN6 gives a secure, leak tight hose joint with low fitting load and would transfer hose loading from tube / body join to larger area boss / body join so hopefully preventing a similar failure in future.
The cooler is as original and from the Citroen 2CV, etc.. Autodoc offer examples from 5 or 6 manufacturers.
View attachment 85266View attachment 85267