exhaust hose system

[LadyInBed]

That'll be the bit that commonly links the exhaust elbow to the water-trap, thereby solving your problem by slightly different means.

For me, that's about 3 mtrs of hose and difficult to get to under aft bunk.
1 mtr elbow to elbow is feasible to carry as a spare but 3 mtrs isn't and a short length I can change at sea which I have done

 

[dleroc]

+1

What size is your exhaust outlet through the hull? Do you have a silencer or anything else (apart from the stainless tubing) between the engine and that outlet? If so what diameter are they?

Thanks for your interest. The inside diameter of the remaining hose to the transom is 41mm. That is also the diameter of the exhaust elbow.
The 'bodge' appears to have been made by fitting a 51mm hose from the exhaust elbow to the ss tube which is 41mm inside diameter. The other end of the ss tube fits into another 51mm tube, about 150mm long, and this is then fitted over the hose leading to the transom -this last coupling is fairly tight due to the thickness of the rubber of the transom hose.
I have been able to get a length of the 41mm diameter hose today. I will secure one end to the exhaust elbow and either (i) connect the other end directly to a newly sawn off end to the transom hose, or (ii) use the ss tube to form an intermediate coupling as exists at the moment.

I am tempted to choose the first option as the less couplings there are the less chance of a leak.

 

[LittleSister]

Thanks for your interest. The inside diameter of the remaining hose to the transom is 41mm. That is also the diameter of the exhaust elbow.

The 'bodge' appears to have been made by fitting a 51mm hose from the exhaust elbow to the ss tube which is 41mm inside diameter. The other end of the ss tube fits into another 51mm tube, about 150mm long, and this is then fitted over the hose leading to the transom -this last coupling is fairly tight due to the thickness of the rubber of the transom hose.

I have been able to get a length of the 41mm diameter hose today. I will secure one end to the exhaust elbow and either (i) connect the other end directly to a newly sawn off end to the transom hose, or (ii) use the ss tube to form an intermediate coupling as exists at the moment.

I am tempted to choose the first option as the less couplings there are the less chance of a leak.

I'm still not sure I'm entirely clear about the arrangement, but the first option seems more convincing. You will need some sort of tubing/coupling to connect you new hose to the existing hose leading to the transom. (You can't properly connect flexible hose directly to flexible hose, as far as I'm aware, You need to clamp hose 1 onto a solid tube or fitting (e.g. water-trap) and then clamp hose 2 on the other end of it). Why not use your existing stainless tube if (as it seems) it's the right size.

By the way, I doubt your hose is 41mm. I believe 38mm, 40mm and 45mm are the standard (nominal, internal diameter) exhaust sizes around that size. If your stainless tube were 41mm external diameter, I think it would fit a 40mm ID hose (it needs to be slightly larger than the hose internal size to ensure a good seal), but you say that's the internal diameter. That would be too big externally to fit a 40mm hose, I think, but seems a bit small to fit a 45mm hose, unless the walls are thick (c2.5mm).

Don't forget to check out fitting a water-trap (as discussed above). The absence of a water-trap could one day wreck your engine.