Raw water Shower Heads

[Top Hatt Craig]

While changing the hoses at our 1978 J&T 6-71N Shower Heads I see the inside surfaces are heavily corroded. I tried to see the business end with a small mechanics mirror but could not. We are not having any cooling issues at this time. Our Heads are the 90 degree bolt-on model and J&T has them (now in stainless) for $1175.00 ea. I've been searching the archives here and there's not much on Shower Heads getting replaced. We're still newbies and welcome any thoughts, thanks Craig

 

[Cricket]

How about a picture? If they're the full water jacket style 39 years is a long time, if they're the type with insulated blanket and just a water shower head 39 years is also probably a long time too. J&T is buying them from somebody and probably adding at least 50%, you might want to call some of the exhaust manufacturers to compare. I prefer the ones with the hard coating for the hot section.

 

[Glory]

Marine manifold, in Farmingdale, NY, made many of the J & T exhaust parts
. Might be able to save a few $$.

 

[motoryacht lover]

I just had mine replaced in my 1995 boat. I was told I could go a little longer but elected not to. If you are comfortable spending the money I would do it.

 

[cpp]

I am also a newbe to the Detroit Diesel 671N's. What are the shower heads you are speaking of? Their purpose.
Thanks,
Chris

 

[Cricket]

The showerhead is on the exhaust hose connection side of the exhaust "riser" ( or elbow), it's where raw water is injected to cool the exhaust gas. Basically 3 styles, insulated hardcoat or water jacketed or insulated with blanket. The insulated elbows just have the water entering the "shower head" on the end. Not sure what the manifold end/connection outlet on a 671N looks like, the 2 elbows in the photos would attach to a turbo, just need to make sure to get an exact match.

 

[SEVEN]

Look up and old post called Exhaust Temp to see a photo

 

[SEVEN]

Exhaust temp alarm that is.

 

[Top Hatt Craig]

I'll post pics Friday, our 6-71N Shower Heads are cast iron with a two-bolt flange on the manifold end and a two inch hose nipple on the other end with a 90 degree bend in the middle. The whole thing would fit inside an empty one quart oil can. Now I'm assuming there's a "shower head" to it, but I don't really know I haven't been able to find a pic. It could be simply a 90 degree fitting allowing a 2" hose to be fastened to the manifold, as there's two other, although smaller raw water lines upstream that dump into the exhaust manifold. When you guys look in the mirror tomorrow know that I think you're great.

 

[Cricket]

Maybe Barr Marine for iron parts??
Guess you need to determine which material to go with.
Fished on a boat with J&T 671n's in the 70's and I know it had exhaust from Marine Manifold on Long Island because I rode up there from NJ with the owner to pick up a jacketed replacement riser that was leaking raw water..

 

[Top Hatt Craig]

Just in case anyone was wondering here’s a pic

 

[ram]

I posted some pictures of mine. Look under "shower head pictures " in the archives. I cleaned them with muratic acid and they came out looking brand new..Good luck