Cambelt replacement; do sprocket locking devices work?

[Graham Stewart]

I have a Lancia Beta Spyder with the 2 litre t/c engine, which will fairly soon need its cambelt replacing. I was flicking through my Cromwell catalogue when I noticed their 'Universal sprocket locking device' (AST4500 Multi-lock II). This is the write-up that accompanied the item:

For twin cam and quad cam engines. A uniquely adjustable tool which locks into the teeth of sprockets to retain them on timing marks during timing belt replacement/engine overhaul. Acts as a 'second pair of hands¢ž¢ helping to retain cam sprockets whilst you are positioning the timing belt around crank, injection pump or tensioner.

Incorporates ‹Å“variable pitch¢ž¢ adjustable arms to cover various sprocket diameters and tooth pitch. Design feature also covers ‹Å“flanged sprocket¢ž¢ applications. Also suitable for ‹Å“locking¢ž¢ between cam and diesel injection pump sprockets on certain diesel engine applications.

Do these devices actually do what it says on the tin, or are they best avoided? All advice gratefully received.

[Guy Croft]

I've used them on non TC units, and yes they are used to stop the pulleys moving when fitting the belt; you can't use them to restrain the pulleys to tighten the securing bolt, not strong enough.

You don't need to use such a tool on the TC to change the belt, I mean I've never had to anyhow.

GC

[Graham Stewart]

Thanks Guy, that tells me what I need to know.