Nanni Heat Exchanger O-Rings

[fishingaz]

hi all .has anyone changed the o rings in a nanni 85hp 5cyl turbo.
im just up to hours that i have to change .but have no idea where to start.i believe the o rings are just inside the end caps?do i just undo the caps and look see ?or is there any special things i should look for?
thanks in advance.
gary

[Blue Stocking]

What model is it. Nanni website doesn't list a 5 cylinder.

[fishingaz]

its a superseded model 5.250tdi.

[Blue Stocking]

Tried to find views of engine on net-no luck-what does Nanni say? Generally heat exchangers have a through-bolt which holds both ends in place, or seperately bolted on ends, with either O-rings or rubber discs. Replacement procedure is usually well thought out by manu, as this is a service which say be carried out under not-ideal conditions. Check that it doesn't also contain zincs, and check tubes for blockage. Sargassum weed berries fit perfectly in Westerbeke tubes.

[fishingaz]

thanks very much.i was hopeing for something like that.
gary .