On mine it is a snug fit - probably less than 1-2 mm. Can you measure your core to see if it is 54mm? That should tell you which model you have.
---In amelyachtowners@..., <herbert@...> wrote :
if you do not have a sleeve installed then the tube goes through the baffle plate with some space (~1-2 mm) left between the plate and the tube. that means that not all the cooling liquid will run through the heat exchanger, some will circulate just through the space between the tube and the plate. right?
Has anyone installed the sleeve? I was not installed on mine, but it seems to me that it should be installed... I have a sleeve in my spare parts, just do not know if I make anything better or worse if I install it according to the manual