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I just finished reading "Marines Under Armor" and it got me interested in the LVT-5. Specifically, I was wondering if anyone has any info or pictures concerning the engine in this vehicle. The LVT-5 was powered by the LV-1790-1, the only water-cooled version of the Continental 1790 series engines. I would love to see an illustration or a picture about how the cooling system on this engine worked.

Hunnicutt's Bradley book has a couple of photos, probably taken from official publications:

Oh cool! I have a PDF of that book, but I guess I never looked through it in detail. Reading PDF's is so much less fun than an actual book. Thanks for pointing this out.

You are most welcome.

Hi friends! Ciao Walter!
the image of the engine/transmission compartment is from the Marine Corps Maintenance Manual (ORD-MM-7000A, October, 1957) and the following is the caption about it that gave Mike Kendall in the unforgettable AFV interiors:

"The engines in all the LVTP-5s were Continental LV 1790 liquid cooled gasoline engines with 1,790 cubic inch displacements and 810hp output. They were 90 degree, V-12 units and were mounted in the center rear of the hull with the Allison transmission coupled directly behind. This image is from the LVTP-5 Maintenance Manual again and shows the roof of the LVTP-5 with the large engine hatch removed and the Continental/Allison mounted down inside. Most of the top of the engine is covered with an oil cooler shroud, seen here as the black plate with the small fan on this end. The short pipes on each side would be connected to exhaust headers that would lead up to the exhaust vent in the center of the panel that has been removed for this picture. Large can-type oil bath air cleaners are mounted on each side of the engine compartment and the large white intake ducts bringing them air from the cargo compartment are seen on either side of the top of the picture.

From the air cleaners the air flows through the shorter corrugated aspiration air ducts directly into the carburetor on each side of the engine. Notice the two fresh air flap doors located up on the roof, just forward of the engine opening. These could be opened or closed by the driver to control the amount of outside air entering the air cleaners and then the carburetors--in this picture the right door is open and the left closed. Also next to the left air door is the fuel filler cap with the filler hose extending down to the floor to the fuel tanks below. The Allison cross drive transmission is on this end of the engine and here is shown painted its typical white. The large cylinder crossing above the transmission is the transmission oil cooler, and if you look carefully you will see water coolant hoses running to and from the radiators in their compartments at the sides of the vehicle (not seen here). One coolant hose is seen entering the transmission oil cooler and the other enters the engine down below. The transmission oil enters and leaves the cylindrical cooler via the four smaller hoses on each end. The shifting and speed changing control rods are seen running across the top of the transmission from the left, originating at the driver's position. The final drives can be seen at the bottom of the picture at either side of the compartment."

I hope will be interesting.
Giacomo