Engine water hose What type?

[Vincentc]

I have a water leak where the hose connects the copper tube running from the thermostat to the heat exchanger. The engine is a 671ti 390 hp Covington. The copper tube measures 2.25 inches OD and the hose slips over the tube. Hope it is just a matter of replacing the hose.
Advice on the correct type and size hose will be appreciated.
Thanks

 

[dottieshusband]

Go blue silicone !

 

[dsharp]

I read somewhere that silicone hose is not the best for water. Check the tube closely. I had a small leak in the tube that runs from the heat exchanger to the circulating pump. When it finally rusted through it lost water and cracked the head. This tube was steel, though. Gates makes radiator hose that comes in 3' lengths that's reasonably priced.

 

[Vincentc]

We had holiday plans for the boat and all that was available was Gates hose. 2.25" hose did the job. The leak is gone. I will watch for a while.

As I understand it, silicone is better for high temp, since this is for fw cooling, silicon is probably overkill.

Thanks for the advice.

Feliz Navidad, you all.

 

[GJH]

I read somewhere that silicone hose is not the best for water.

That is absolutely wrong wherever you read it. Silicone is the best thing for all the short water connectors on the engine, salt and fresh. Seals better, stays flexible for far longer and especially stands up to heat.

 

[Angela]

When I replaced mine, I went to Detroit Diesel and asked what was supposed to go on there. After obtaining my engine serial number from me, they gave me a quantity of blue silicone hose for that very purpose that was sufficient to do every one of those hoses. They've performed flawlessly for several years now.

 

[captddis]

That is absolutely wrong wherever you read it. Silicone is the best thing for all the short water connectors on the engine, salt and fresh. Seals better, stays flexible for far longer and especially stands up to heat.

Not a chemist but the blue silicone hose with the red liner inside does seem to react with the salt water after a while. I only use the black hose on the salt water side.

 

[Boatsb]

I used the gay italian hose on most of my replacements and it worked great. Double wire and quite durable. Alfagoma was the brand.

 

[Vincentc]

"Gay Italian hose" ?
But This a straight connection .

Merry Christmas

 

[dottieshusband]

Ditto Angela and GJH, Double D provided the silicone hoses. I gotta think they know what's best.

 

[jim rosenthal]

Scott, a typo?

I agree about the blue hose on the FW side. But I've also seen it used on the saltwater side, inc on my boat when Slane's installed my engines, and it's holding up fine. I think it IS made for that.

 

[Boatsb]

It really is alfagoma. made in Italy and great to work with. I use it on Seawater all the time. Its nicer than the shields and holds up.

 

[jim rosenthal]

Where do you buy it? I can look it up etc but since you are in the business it would be useful to know where you get it.

 

[34Hatt]

Ditto Angela and GJH, Double D provided the silicone hoses. I gotta think they know what's best.

Good Luck with that Assumption

Me personally would takes Dave's suggestion over someone behind a counter any day but that's just me.

 

[bigbill]

while we are on the topic of hoses, what do ya'll think is the best hose to use for a/c water? i need 1 1/4 from seacock to strainer, to pump, and 1 inch from pump to manifold. i am making a pvc manifold like spcoolin suggested, and will be changing all hoses while i'm in there

 

[Boatsb]

The black hoses have less growth in my experience. I usually use the wire reinforced Alfagoma on the intake and the black water hose on the output of the pump.

 

[GJH]

On my boat, all the long salt water runs are black exhaust hose, ditto including for the AC. You need the rigidity and it does seem that it breed less growth, compared to what we saw coming out of the Ac units themselves when acid cleaning. No empirical evidence other than observing when I switched it out for the right size from a POs mis-install.I just replaced about 3 ft section on the generator outlet with some of the Vetus gray hose, sounds like what Scott is talking about. It went around a sharp bend much better than the old hose which had developed a kink.

On the main engines, silicone is used for all the short connections, including some seawater in and out of the intercoolers; the two old school Detroit mechanics I use both were very particular about using silicone there, and installing new ones at about the 5 year mark at the nearest scheduled intercooler cleaning. When the PO had the engines "done", using a legendary guy (since deceased) from Central in Landover MD. So make it three. Hardly "some guys behind the counter".

 

[Glory]

Trident, makes a good product. Stay away from Sheilds.

JM