Another dull question....

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CMJ

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.....yup, sorry no joke and perhaps suited better on the pratical boat owner forum - but thought I'd try you experienced mobo'ers first:-

I need to replace the seawater hose that runs to (or from - not sure) the gearbox oil coolers as it's begining to look a little tied. Although I don't think any exhaust gases are mixed with the water at this point, should I be looking to source what seems to be called marine exhaust hose? I want to get my choice right so as to hopefully avoid sinking the boat if it bursts :D :D :D

Ideally would have found a direct replacement for what's already on there but can't match any of the details printed on the hose (apart from manufacturer being TOGUM).

BTW, size is 1" internal diameter

Thankyou if you've managed to get to the end of this post before drifting off :)
 
sarabande said:
any details pls ?

Engine type / gearbox type, any makers numbers on existing hose ?


Photograph ?
Click to expand...

Oh - some interest! - THANKS :)

Ok, CAT C12's, should remember the ZF g/box number but 90% sure they're 325's
Existing hoses say TOGUM, 22207, TUBI SPECIALI, MADE IN ITALY, DAL1971

And here's the best pic I've got:

Hose.jpg


Many thanks!
 
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p.s...

found local supplier (HYPHOSE) who sells 'MARINE EXHAUST HOSE', 1" Internal diameter at £9.50/metre - I need 5 metres and want to replace before weekend....but won't go ahead until I know it's suitable (it's Lloyds certified of some sort)......Thx
 
Never a dull question here.

Hi CMJ

Must admit that photo shows a marine hose that has seen better days. No wonder you want to change it.

Have you been in touch with the guys through the link below? If no one else can help they may well be able to identify your current hose from the information supplied and be able to spec up a suitable "guaranteed" replacement.

Reinforced rubber exhaust hoses – “HYDROHOSE” series. offers its Customers a wide range of reinforced rubber exhaust hoses in the “HYDROHOSE” series, ...
www.silencermarine.com/inglese/silenziatori.htm

Cheers

Mike
 
SovereignDiver said:
Hi CMJ

Must admit that photo shows a marine hose that has seen better days. No wonder you want to change it.
Click to expand...

Strange though as all other hoses look like they're in great condition still (just these two - one on each engine looks bad - especially considering they're only 4 years old. Must be the heat as both very near the turbos).

If they've deteriorated due to poor grade rather than heat, then seems unwise to find a perfect match for these, but rather upgrade the quality instead.
 
CMJ, those hoses carry only hot sea water (~80deg), no exhaust gas, so exhaust hose isn't needed. But if I were you I'd get the fireproof exhaust grade hose anyway. Reasons are that (i) it will be more resistant to degradation from radiant heat from the turbos, (ii) it isn't much dearer in the 1inch size, and (iii) if you had an engine room fire then exhaust grade hose might stop the boat sinking, indeed it would (quite rightly) be a necessity of the boat were MCA coded.

There are plenty of suppliers, including Vetus catalogue
 
jfm said:
CMJ, those hoses carry only hot sea water (~80deg), no exhaust gas, so exhaust hose isn't needed. But if I were you I'd get the fireproof exhaust grade hose anyway. Reasons are that (i) it will be more resistant to degradation from radiant heat from the turbos, (ii) it isn't much dearer in the 1inch size, and (iii) if you had an engine room fire then exhaust grade hose might stop the boat sinking, indeed it would (quite rightly) be a necessity of the boat were MCA coded.

There are plenty of suppliers, including Vetus catalogue
Click to expand...

Thanks JFM - will definately buy the fireproof exhaust grade hose......
BTW, the Vetus catalogue looks great - never seen it before believe it or not!
 
All the C12 cats I have worked on have 2 1/2 inch hose as they are part of the main raw water circuit, The Vetus hose is one of the easiest to fit being the most flexible hose that I have used.
 
aquapower said:
All the C12 cats I have worked on have 2 1/2 inch hose as they are part of the main raw water circuit, The Vetus hose is one of the easiest to fit being the most flexible hose that I have used.
Click to expand...


CMJ said inch in his post and they do look inch in the photo. I agree that's too small if it's in series in the main circuit; it must be plumbed in parallel to the main circuit I suppose. I'm as surprised as you but it must be an Azimut thing...
 
jfm said:
CMJ said inch in his post and they do look inch in the photo. I agree that's too small if it's in series in the main circuit; it must be plumbed in parallel to the main circuit I suppose. I'm as surprised as you but it must be an Azimut thing...
Click to expand...

Yup, pretty sure it's in parallel but you got me thinking now 'bout how the seawater system is configured so will have a look at the manual. Hoses that run from seacocks to pumps are def 2.5" at least.

Anyway, I replaced the hoses today with Lloyds certified Marine Exhaust hose and pleased to get rid of the old cracked ones! Great price at £10/metre from www.hyphose.com - 'bout 1/2 price to marine stores so worth going there if you need hoses.

Thanks for your help everyone.
 
CMJ said:
Yup, pretty sure it's in parallel.
Click to expand...
Agreed.
I'm actually surprised by aquapower comment, 'cause I can neither see a reason why the transmission cooler should be in series to the main flow of the raw water circuit, nor the hose should be bigger. One inch is plenty, for that kind of job!
 
MapisM said:
Agreed.
I'm actually surprised by aquapower comment, 'cause I can neither see a reason why the transmission cooler should be in series to the main flow of the raw water circuit, nor the hose should be bigger. One inch is plenty, for that kind of job!
Click to expand...

I havnt worked on every kind of marine engine there is but of all the Volvo/Cat/Yanmar/ Mercruiser/Perkins/Sabre/Mermaid I cant recall ever seeing a gearbox cooler thar is not in series to the main raw water cooling circuit, the only cooler I can recall on a C12 that has 1in hose and is not standard fit is the power steering cooler but this depends on builder.
A gearbox of this size will take a lot of cooling, I dont design these systems I just fit/service what is supplied by the engine supplier.
If you know of a set up like this then will be interested to see how it works.
 
Doh! Sorry, I completely misunderstood the point, and poorly wrote what I meant, either.
I assumed that the hose we were talking about is an OIL hose, one of the two bringing the gearbox oil to/from the oil cooler.
Oil which obviously can't be in series with the engine oil cooler, and whose hose doesn't need to be more than 1".
CMJ, are you sure that's a seawater hose?
 
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MapisM said:
CMJ, are you sure that's a seawater hose?
Click to expand...
Well, I replaced it yesterday and definately clear water came out of it (compared to the closed fresh water system that has red antifreeze in it). Also, it goes up to a large collar (along with a fatter hose also - maybe reinforcing the parallel theory) on the exhaust that has pencil anodes in it that I change frequently.

This has got me curious though now as either this is a bit of a weird set-up, or I've seriouly misunderstood something?!
I'm on the boat later and will get my head 'round how it's all connected and post a sketch of the circuit at some point in the next few days :)
 
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Just a couple of pics that might give some clues (before I can get down to boat to see 1st hand and work it out)....

1st pic is one that I took yesterday, the other is from an identical boat (few serial numbers older) that I took pics of last year.

AZ1.jpg


DSCN6609.jpg
 
CMJ said:
Well, I replaced it yesterday and definately clear water came out of it (compared to the closed fresh water system that has red antifreeze in it). Also, it goes up to a large collar (along with a fatter hose also - maybe reinforcing the parallel theory) on the exhaust that has pencil anodes in it that I change frequently.
Click to expand...
Yep, that's definitely a seawater hose. The oil hoses are the other ones visible in the pics, attached on each side of the oil cooler.
I just can't get my head around why BOTH seawater hoses are connected to the exhaust collar.
One of them surely must bring water to the cooler, before discharging it through the exhaust...?!?
Where does the hose on the other side of the T nipple go?
 
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