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 Author  Topic: water cooling outlet on Elco 80

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Post a Reply To This Topic    Reply With Quotes     Edit Message   Posted on: Mar 26, 2015 - 12:18pm
I wonder if anyone can help me.
I have built a 1:24 scale model of an Elco 80 and trying for realism want to position the engine water cooling outlet in a similar position as on an actual craft. I cannot see on any photos etc where this comes out. various videos seem to show it under the boat somewhere. I have looked at pictures of PT 617 but can't see an outlet. Being in the UK I cannot visit the real thing, unfortunately.

I would be grateful for any clues.

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Dick   Send Email To Dick Posted on: Mar 26, 2015 - 12:52pm

Stan . . .

Navigate to our "Free PT Documents" page (see link up in this page's masthead) and view or download the "Elco Parts Catalog - - - September 23, 2010 - - - PDF File".
There you will find many plumbing/tubing diagrams which will show you all inlet and outlet ports.

Dick . . .

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  Jerry Gilmartin


Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Jerry Gilmartin   Send Email To Jerry Gilmartin Posted on: Mar 27, 2015 - 12:00am
Hi Stan,
I am pretty sure the Engines were all cooled by individual (one for each engine) scoop injection system that scoops up water from the bottom of the boat (underwater) and then it flows through a stop valve, then to the Engine oil and Freshwater heat exchangers (Shell and Tube style, in series with the Seawater on the tube side) to remove the heat, then the cooling seawater flows back into the sea through another valve located on the bottom of the boat. I don't know if you could ever model that accurately save to place a cooling water flow under the water. I am not sure how Elco did their exhaust, but I think there was a small amount of seawater cooling the exhaust fittings as well, It was a dry exhaust (water was never actually mixed with the exhaust inside the pipe, rather it was on the outside of the pipe between the pipe and the hose). So the outer shell of the exhaust stack was cooled with seawater. This was important in order to prevent seawater from being sucked back into the engine after the engine was turned off and the pipes cooled. The cooling seawater would form a vacuum which could suck water into the exhaust manifold of the engine: = Not good! Anyway, I think there was some amount of seawater squirting out each of the six exhaust ports on the stern of the boat. I am not sure how much water it was, probably just enough to dribble down the back or possibly squirt out maybe a foot or so.

I hope this was helpful.

Jerry Gilmartin
PT658 Crewman
Portland OR

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Post a Reply To This Topic    Reply With Quotes     Edit Message   Posted on: Mar 31, 2015 - 1:02pm
Thank you both for your replies. I will see if I can incorporate something like it in the model. when I eventually finish it would it be OK to attache a photo as I would appreciate your views on accuracy. My only other issue is colour. I think the hull seems to be a mid grey. Was that the predominant colur for most boats.

I find the documents here fascinating.

Thanks again for your help.


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Stuart Hurley


Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Stuart Hurley  Posted on: Apr 1, 2015 - 12:23am
I think I remember seeing a water outlet on the aft starboard side in the film 'They were expendable' which might be what you need. I can't remember when it was in the film but there was a scene with boats returning from patrol. After the shot of the mast with a broom attached, you see one boat with a water outfall just under the deck edge adjacent to the engine hatch.
I was under the impression this was a battery vent but I reckon water is being discharged from this. There are also a couple of bilge pump outfalls, one forward on the stbd side and one aft/ midships on the port.
Good excuse to watch the film again I guess.

Colours would depend on the time frame of your model. Grays or greens.

PS. Checked it out on Youtube and its at around 36.51.

Best Regards,

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