I got the accelerator cable in on Friday, and after breakfast on Saturday morning I went outside to put it in. It’s fairly straightforward and went in without too much hassle, once I realized the loop molded into the cable wasn’t supposed to hook over the top of the bracket, but used to screw in (and provide room for adjustment) on the bracket itself. The cable hooked right up, and in about 10 minutes I was ready to fire it up and go for a test drive. But when I put the clutch in, the engine revved.
It turns out this isn’t an uncommon problem; what happens is that the cable is too tight on the carb, and the clutch linkage at the pedals travels up the firewall right next to the accelerator. When I push the clutch in, it forces the throttle linkage backwards, revving the engine. Problem is, I’ve got no play at all on the bracket. The cable is pushed as far forward (towards the carburetor) as possible; there’s nothing else. The arms on the carb aren’t adjustable, and there’s no other allowance for adjustment in the cable itself.
I looked in the fittings and bracketry that came with my second engine, but there’s no spare there. So I’m going to fabricate a U-shaped piece of metal with two holes. One side will go on the bracket and the other will hold the cable, and I’ll build in room for forward adjustment.
In other news, Finn and I drove to White Marsh to visit a guy who had an original IH Service Manual for sale on Craigslist. I have the new reprints from Super Scout Specialists, and they’re great, but I couldn’t pass this up. It’s softbound but 3-hole punched, so now I’ve got to keep my eye out for a 1 1/2″ red binder to put it in.
In doing the preliminary research on my carburetor, I stumbled upon a 16-part video series detailing the process of rebuilding a Thermoquad, which I downloaded for future reference.