Wet exhaust hose

Can last for years. My boat still has hose from 1992. Difficult to check externally, particularly if it is the old heavily wire reinforced type. The most vulnerable bit is the initial run from the engine to the water trap.
 
Mine were starting to leak water into the bilge along the hidden base of the lowest run. This after 25 years. When I ran my hand underneath the rubber was soft in patches where the reinforcing wires had rusted away. The exposed sides I could see looked fine.

I expect they had been soft for a while. However the last meter or so of the runs down to the transom outlets was like new, which was fortunate because access to the outlets would have required cutting panelling away, instead I used joining tubes with wide heavy duty jubilee clips from ASAP.

I inserted some small wooden battens under the new hoses to keep them dry, although they do sit for ever with a toxic soup of concentrated exhaust contaminated saltwater, so I guess 25 years isn't so bad.

Changing them was up there with changing stern seals and cutlass bearings in regard to being one of the worse jobs. The stbd engine connection required three 90 degree bends in different directions within a tube length of less than a meter, and this was 90mm I.D. hose.
 
superheat6k said:
Mine were starting to leak water into the bilge along the hidden base of the lowest run. This after 25 years. When I ran my hand underneath the rubber was soft in patches where the reinforcing wires had rusted away. The exposed sides I could see looked fine.

I expect they had been soft for a while. However the last meter or so of the runs down to the transom outlets was like new, which was fortunate because access to the outlets would have required cutting panelling away, instead I used joining tubes with wide heavy duty jubilee clips from ASAP.

I inserted some small wooden battens under the new hoses to keep them dry, although they do sit for ever with a toxic soup of concentrated exhaust contaminated saltwater, so I guess 25 years isn't so bad.

Changing them was up there with changing stern seals and cutlass bearings in regard to being one of the worse jobs. The stbd engine connection required three 90 degree bends in different directions within a tube length of less than a meter, and this was 90mm I.D. hose.
Click to expand...

I had to change this one last August. It had only lasted 10 years before it started to leak seawater.

IMG_5465.JPG


As you say, a terrible job which needed two people.

Re Tranona's post ..... can you buy wet exhaust hose which is not spiral wire-wound? I could have done with some of that. :ambivalence:

Richard
 
The latest exhaust hose still has reinforcement in it but does not seem to be the thick hard stuff. Much more flexible and the one I used did not require the hose to be cut back and wire removed to fit onto spigots.
 
I had one chafe slightly on a bulkhead. It failed at about 12 years.
I only replaced the first section, on the grounds the rest of it is cooler and not stressed by the engine vibrating.
 
Tranona said:
The latest exhaust hose still has reinforcement in it but does not seem to be the thick hard stuff. Much more flexible and the one I used did not require the hose to be cut back and wire removed to fit onto spigots.
Click to expand...

That sounds like the 3m of Seaflow I bought from ASAP. A lot more flexible than the stuff on the pontoon in the photo but I don't know how much of the old stuff's rigidity was due to age.

Richard
 
Vetus exhaust hose claims to be "the most flexible hose available" and the specification seems to support that. Bending radius for Vetus 2" hose is just over 3"; bending radius for Seaflow 2" hose is 8".
 
My hose from manifold to water trap looked fine outside. Inside entire lining had collapsed and ready to block completely any time. Boat built 1989, No idea if it was original but guess so. It's a Southerly with yanmar 2GM20. Hose replaced.
Incidental discovery whilst engine removed to replace fuel tank. Relieved to find it now......
 
blan321 said:
My hose from manifold to water trap looked fine outside. Inside entire lining had collapsed and ready to block completely any time. Boat built 1989, No idea if it was original but guess so. It's a Southerly with yanmar 2GM20. Hose replaced.
Incidental discovery whilst engine removed to replace fuel tank. Relieved to find it now......
Click to expand...
Did you replace or at least inspect the mixing elbow while you had it apart?
 
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