Help: Camshafts & Engine Rebuild Book

[crashr]

I am very confused with respect to the method for removing the timing chain and a paragraph in Waynes new book.

If anyone has a precopy of this book the paragraph is in Chapter 2: Engine Teardown, Section: Camshafts, 4 paragraph. The paragraph reads:

"At this point, you want to check that the flywheel lock is attached to the engine, and holding the cranksjaft secure. As a precaution, use a 13mm wrench to loosen each valve adjustment lock nut and back off each valve adjustment screw as far as you can go. Backing off this screw will minimize the likelihood of the valves hitting the tops of the pistons when you are rotating the crankshaft with the chains detached."

First I don't understand how I will be able to undo the camshaft nut or get the chain off after that without having to turn the chain. Secondly at the begining of this statement it says that the you will be holding the crankshaft secure while at the end they talk about turning the crankshaft.

I guess my biggest question here is "Do I have to lock the flywheel while trying to remove the camshaft nut/sprocket???"

[john walker's workshop]

if you try to remove the cam nut/bolt by hand, without the special cam or sprocket holding tools, the crank will want to turn. if you use an impact wrench, it won't so much. after the nut/bolt is off, the sprocket just wiggles off. on reinstall, the cam or sprocket is held with special tools, as you tighten the nut/bolt, so the crank turning is not a concern. "nut" style cams use a slotted tool to hold the end of the cam, "bolt" style cams use a tool that holds the sprocket.

[crashr]

I bought both the 44mm crows foot as well as the Porsche cam tool. Do I turn the cam nut with the porsche tool and hold the crows foot steady or vice versa???

[TimT]

hold the cam, and loosen the nut...that usually works

[Jadams1]

Hold the camshaft from turning and loosen with the crawfoot socket. Do the same when tightening.



Photo credit courtesy of Deborah Adams