some advice would be greatly appreciated , i have replaced the timing belt on my 3.4 dohc engine(94 grand prix)and having the old belt break all timing points were lost,thier is no valve damage(thank god)but the timing marks(yellow paint on the cam sprocket teeth)appear to be wrong,probally someone else before worked on it,i have had the car scanned at a repair shop because no matter what i did it still appears out of tune,they said all is good with the exeption that it is just out of tune.the cams are not right ,i am sure and the mechanic okayed that my intermediate sprocket,crank marks are right with tdc on no.1,so the trouble is soley with the cams not right,upon many people "guiding me"internet help and a few manuels,i have removed the plenum,cam carrier covers,and have the "flats"on the camshafts facing up and locked down,i have loosened the sprocket bolts on the front cams(closest to front of vehicle)so they are freewheeling,upon putting belt back on and tensioned,i was instructed to rotate assembly by hand 360 degrees(back cams with hold downs off and front still locked down"sprockets freewheeling"then after doing this,tighten front cam bolts down and release the cams to turn with belt,i stopped at this point,but am i on the right track so far????i don't really understand why the front has to be freewheeling for 360 degrees ,then released to complete timing????the book also then mentions something about after this procedure,the back cam flats will be 180 degrees different then the front flats???this also i don't understand,if all flats are face up ,upon 360 degreese,wouldn't they be in unison???? thanks
- posted
17 years ago