Thanks for you input. I couldn't find seals with stainless steel body and ended up using standard seals. All the old seals had the rubber coating cracked right down to the stainless steel body. I hope the new ones wont do that... The mild steel springs I replaced with stainless steel springs.
To Nauticalnomad: the C320's are
the new models. Why isn't it relevant to have seals with stainless steel body? Why do you think the quality of the old Profurls is better? Just curious.
There is some info on the web on how to overhaul
the Profurls but not much. Profurl don't give out info on how to do it, no drawings and no parts
list. Luckily it's not much of a challenge. The most difficult part is getting the bottom circlips out without damaging the hollow aluminum
Profurls are not really designed with maintenance
in mind, e.g. the holes in the housings which allow the excess grease to escape when the last seal is pushed in are sealed with stainless steel balls pressed into the hole - impossible to replace. I drilled new holes and sealed them with grub screws and I also installed grease nipples.
Most disappointing; one shaft was mistakenly machined 0.1mm under size. Profurl just glued the bearings in! To sleeve it isn't possible, it would weaken the hollow shaft too much. The only option was to glue the new bearings in again (I used Loctite 660).
Why did I overhaul
the furlers? I bought the two C320's when they were just new on the market almost 10 years ago. I'm redoing the rig and I thought replacing the bearings and the seals would hopefully ensure trouble-free operation for another 10 years. Not a bad idea - moisture had already got well past the seals. The grease behind the seals was discolored but the bearings themselves were still clean. It would've been good for some time but who knows for how long.
Would I overhaul the Profurl again? Definitely not for coastal cruising. Best use it until it gives you troubles and than deal with it. For cruising offshore
it makes sense. Being out there with a broken bearing would be a major inconvenience.
Would I buy Profurl again? Not too sure. I guess all the furlers have their pros and cons. I had an issue with the luff extrusions coming apart because the screws holding them together came undone (red Loctide fixed that problem) but apart from that I was quite happy with it. The Profurl seems to work fine but if it comes to maintenance
they somehow let you down.