[Henry James the 47th]

There should be a vacuum tank reservoir - I'd be surprised if there weren't at least evidence of it somewhere. Diesels have vac. reservoir tanks - I've not seen a diesel cruiser without one located somewhere - then again, this is a '76 vehicle, so maybe they didn't use them at that time(?) (I'm skeptical).

Usually in 40 series rigs the tank is located under the cab, bolted to the outside of the chassis rail. It has an inlet and outlet, and a sender switch on the back. On 60 series rigs, the tank is much smaller and is usually bolted to the engine bay firewall or fender apron. The reservoir is connected to the vacuum pump and to the brake booster. For some reason, this entire reservoir system is not mentioned in the FSM, at least the 1980 edition anyhow. Here's a couple of pictures of my tank prior to restoration, showing what it looks like and where it is located (though I have unbolted it and placed it atop the chassis rail in this instance - you can see the bolts that mount it sticking out of the chassis side below). I'm not sure what side of the chassis yours would have been on. I'm relocating mine the left hand side as it shortens all of the piping runs.

Thanks for the pics of the throttle linkage. I can also see another difference between the H and 2H motors: there is no aluminum oil cooler housing (sometimes termed "water inlet jacket") on the side of the block.

I've added a third picture I pulled off the web a few months ago of a LHD HJ45 engine bay. That one had the same 'reversed' rad too, so i wonder what the stock set up is. If you look closely at the brake booster, you will see the rubber line coming from it, transitioning to the metal tube that runs across the firewall (note that there are two of them) and down - this tube then hooks to another rubber pipe that goes to the vacuum reservoir. The other metal pipe should be connected to the back of the alternator pump. This indicates that the vac. reservoir should be under the passenger side floorpan.