too much DIY to
think about cars....
Join Date: Mar 2007
Location: United Kingdom
always a good debate on this one... the issue with just paint marking things up and replacing the belt is that over time the old belt will stretch a little, so it may be 1 or 2 mm longer between given points, for example crank pulley to cam pulley. Automatic tensioners take this up, as does incorrect adjustment!
So if you just replace the belt using old marks, yes, its almost impossible to be a tooth out, yes it will run OK.. but you have no way of knowing if its actually 100% correct. A lot of engines don't have vernier set ups, and work "OK",, Alfa tend to do things right and fit verniers. The only way to be 100% correct is follow the factory processes, slacken verniers, fitting locking tools and adjusting as instructed.
Just my 2 pence worth, i have 30 years on the spanners, every day is a school day, i have learnt that manufactures that design and built engines tend to know more about them than me..
willi, I have seen the belts that you mention, the ones with printed marks on them to align to sprockets. a lot of french cars use them. that works as the new belt is the correct length so pullys are correct in relation to each other