When I try to loosen the bolts, the sprockets move. Jamming an object in the sprocket holes doesn't work. I found that "tool #5034" is a counterhold that works for both. Any suggestions on locating a supplier for the tool or removing the bolts?

I had success in holding the sprockets with a rubber strap wrench which I bought at Sears. I've used that same wrench for many other jobs on the engine such as holding the fan pulley hub while R&R the four screws which hold it on.

If you still have the old timing belt you can pinch it off around each sprocket with a pair of channel lock pliers. This will keep the sprocket from moving enough to unscrew the bolt, which shouldn't be on with very much torque. After you replace the oil seals (which is the only reason you would need to get the sprockets off) then use the old belt in this manner to tighten the bolts back on. Don't use this technique with your new belt.

This won't help those in the middle of a project, but.....I suggest a welding class at the local tech school or community college. I did, for about $90, and after learning the basics, made measurements, scoured this site and then made up many of the special tools needed for 240 work. They sure ain't pretty, but in the toolbox now are the crank holding tool for the 940, a cam/inter. sprocket holder, the fuel tank bung nut tool, front strut J-hooks, the rear TAB tool, and a few others. Plus, I learned to weld. Sort of.
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Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar MGB, and numerous old motorcycles)

Belt is already off, right? Use a poor man's impact wrench. Hold a box wrench on the bolt with your left hand and whack the end of the wrench sharply with a hammer. The inertia of the cam shaft or intermediate shaft will be its own counterhold.

Use the search engine...look for "rope trick"

The rope trick is for the crank pulley, not the other 2 pulleys.
I use a strap wrench (oil filter wrench) on the cam and intermediate pulleys.
You wrap the strap around the pulley and hold it in place with one wrench, and then loosen the bolt with another wrench.

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Matt L. -- Cary, NC -- '91 740 wagon

I've been trying for weeks to figure out how to hold those sprockets while trying to remove the bolt. The manual said to stick a screwdriver in the hole if you didn't have a tool. I had a suspicion that wouldn't do the trick.

I use a pipe wrench with plenty of cushion around the jaw teeth. (pieces of garden hose on either side). Push with the pipe wrench one way while pulling with the socket the other way. Works every time