Luke's on the right track. The military version was modified to be driven in water. Had plugs for the breathers and an intake tube that could be used to pull air from the cab near the top of the dash. All of the electrical system was sealed, including the distributor and plugs. Ignition wires had screw connections on them. They also had a governer. It's been 30 years since I worked on one, but I was thinking they were designed to be driven with the engine completely submersed.


Fred
52 3600
69 C-10